Steven A. Cummer | Scholars@Duke

Steven A. Cummer
Professor of Electrical and Computer Engineering

Dr. Steven Cummer received his Ph.D. in Electrical Engineering from Stanford University in 1997 and prior to joining Duke University in 1999 he spent two years at NASA Goddard Space Flight Center as an NRC postdoctoral research associate. Awards he has received include a National Science Foundation CAREER award and a Presidential Early Career Award for Scientists and Engineers (PECASE) in 2001. His current work is in a variety of theoretical and experimental electromagnetic problems related to geophysical remote sensing and engineered electromagnetic materials.

Current Appointments & Affiliations

Professor of Electrical and Computer Engineering, Electrical and Computer Engineering, Pratt School of Engineering 2012
Bass Fellow, Electrical and Computer Engineering, Pratt School of Engineering 2012

Contact Information

3455 CIEMAS, Durham, NC 27708
Box 90291, Durham, NC 27708-0291
cummer@duke.edu (919) 660-5256
http://www.ee.duke.edu/~cummer/

Background
Education, Training, & Certifications
- Ph.D., Stanford University 1997
- M.S.E.E., Stanford University 1993
- B.S.E.E., Stanford University 1991
Duke Appointment History
- Associate Professor of Electrical and Computer Engineering, Electrical and Computer Engineering, Pratt School of Engineering 2007 - 2012
- Assistant Professor of Electrical and Computer Engineering, Electrical and Computer Engineering, Pratt School of Engineering 2000 - 2006
- Assistant Research Professor of Electrical and Computer Engineering, Electrical and Computer Engineering, Pratt School of Engineering 1999
Recognition
In the News
- APR 10, 2018 Pratt School of Engineering
  
  Thin Engineered Material Perfectly Redirects and Reflects Sound
- MAR 26, 2018 Duke Stories
  
  Beyond Materials: From Invisibility Cloaks to Satellite Communications
- MAY 4, 2017 Pratt School of Engineering
  
  3-D Printers Open New Design Space for Wireless Devices
- OCT 14, 2016
  
  Lego-Like Wall Produces Acoustic Holograms
- MAY 23, 2016 Marketplace Tech
  
  Steven Cummer explains auditory invisible cloaks
- DEC 18, 2015 Triangle BizBlog
  
  NCSU, Duke researchers develop material to improve medical diagnostic imaging
- AUG 13, 2015
  
  Helping Siri: New Sensor Helps Computers Separate Overlapping Sounds
- AUG 11, 2015 The Daily Mail
  
  'Hearing aid' picks out voices in a crowd: Device mimics how the brain processes sound using the 'cocktail party effect'
- AUG 11, 2015 Nature
  
  3D-printed device helps computers solve cocktail-party problem
- APR 21, 2015 The News & Observer
  
  Steven Cummer: Is there more to lightning than meets the eye?
- JAN 26, 2015
  
  There's More to Lightning Than Meets the Eye
- SEP 29, 2014 The New York Times
  
  On the hunt for a sprite on a midsummer's night
- MAR 12, 2014 The Huffington Post UK
  
  3D-acoustic cloaking device can make you invisible -- to dolphins
- MAR 11, 2014
  
  Duke engineers build world’s first 3-D acoustic cloaking device
Awards & Honors
- Fellow. Institute for Electrical and Electronics Engineers. 2011
- Presidential Early Career Awards for Scientists and Engineers. President of the United States of America. 2001
Research
Selected Grants
- Advancing Magnetization and Polarization Low Frequency Imaging (AMPLiFI) awarded by Defense Advanced Research Projects Agency 2017 - 2019
- Collaborative Research: Observations of High-Energy Radiation Associated with Thunderstorms awarded by National Science Foundation 2016 - 2019
- Acoustic Metamaterials and Imaging awarded by Intellectual Ventures Management, LLC 2017 - 2018
- Additive Manufacturing of Radio Frequency and Microwave Components from a Highly Conductive 3D Printing Filament awarded by Multi3D LLC 2017 - 2018
- EFRI NewLAW: Reconfigurable Nonreciprocal Acoustics and Topological Phases in Spatiotemporally Modulated Media awarded by University of Illinois at Urbana--Champaign 2016 - 2018
- Expanding the Limits of Acoustic Metamaterials awarded by Office of Naval Research 2013 - 2018
- Development of a Modulating RF Reflectarray awarded by Lockheed Martin Corporation 2017
- Terrestrial Gamma-Ray Flash (TGF) Research with Fermi GBM awarded by University of Alabama in Huntsville 2014 - 2016
- ADVICE: Advanced Diagnostics for VLF Ionospheric Channel Estimation awarded by University of Florida 2015 - 2016
- Transformation Optical Materials awarded by Army Research Office 2009 - 2016
- Collaborative Research: ADELE Operations on the Hurricane and Severe Storm Sentinel awarded by National Science Foundation 2012 - 2015
- Development and Demonstration of Active Broadband Acoustic Metamaterials awarded by Office of Naval Research 2012 - 2015
- Remote lightning current and charge transfer measurements awarded by National Science Foundation 2011 - 2014
- CEDAR: Global and Local Measurements of Lightning-mesosphere Interactions awarded by National Science Foundation 2010 - 2014
- Physical Origins of Coupling to the Upper Atmosphere from Lightning (PhOCAL) awarded by Defense Advanced Research Projects Agency 2010 - 2014
- Automated Micromanufacturing for Optical Sensing and Computational Imaging, Metamaterials, and Quantum Computing awarded by Air Force Office of Scientific Research 2012 - 2014
- Large Scale Lower Ionosphere Remote Sensing awarded by National Science Foundation 2007 - 2011
- Magnetospheric Remote Sensing Through IMAGE, WIND, and CLUSTER Radio Tomography Experiments awarded by National Aeronautics and Space Administration 2007 - 2011
- Remote Measurements of Lightning Current and Charge Transfer with Low Frequency EM Sensors awarded by National Science Foundation 2007 - 2011
- CEDAR: Quantitative Measurements of Lightning-Mesosphere Interactions from Remote Electromagnetic Fields awarded by National Science Foundation 2005 - 2009
- A Numerical Simulation Tool for Planetary Subsurface Radar awarded by National Aeronautics and Space Administration 2004 - 2008
- VLF Sensor System Build and Integration awarded by U.S. Geological Survey 2008
- CAREER: A New Approach for Radio Remote Sensing of the Ionosphere awarded by National Science Foundation 2001 - 2007
- Scientific Services and Computer Modeling for Tribocharging of Martian Dust Project awarded by National Aeronautics and Space Administration 2005 - 2006
- Novel Remote Measurements and Analysis of Continuing Lightning Current awarded by National Science Foundation 2002 - 2006
- Scientific Services and Computer Modeling for Tribocharging of Martian Dust Project awarded by National Aeronautics and Space Administration 2004 - 2005
- Quantitative Measurements of Lightning-Mesosphere Interactions from Remote Electromagnetic Fields awarded by National Aeronautics and Space Administration 2004 - 2005
- Magnetospheric Radio Tomography: Observables, Algorithms, and Experimental Analysis awarded by National Aeronautics and Space Administration 2002 - 2005
- Scientific Services and Computer Model Development for ACES UAV Project awarded by National Aeronautics and Space Administration 2003 - 2004
- Scientific Services and Computer Modeling for Tribocharging of Martian Dust Project awarded by National Aeronautics and Space Administration 2003 - 2004
- Well-conditioned Multi-level Fast Multipole Modeling of Military Communication Channels awarded by Army Research Office 2001 - 2004
- Intense Lightening-Generated Electromagnetic Fields awarded by National Aeronautics and Space Administration 2001 - 2004
- Scientific Services and Computer Model Development for Mars'03 MATADOR Mission awarded by National Aeronautics and Space Administration 2001 - 2002
Publications & Artistic Works
Selected Publications
- Book Sections
  - Cummer, SA, and Cummer, SA. "Design for simplified materials in transformation electromagneticsDesign for simplified materials in transformation electromagnetics (PublishedPublished)." In Transformation Electromagnetics and Metamaterials: Fundamental Principles and Applications, 117-137. July 1, 2014. Full Text
- Conference Papers
  - Lu, G, Fan, Y, Zhang, H, Jiang, R, Liu, M, Qie, X, and Cummer, SA. "Reconstructing initial continuous current waveform in rocket-triggered lightning with close magnetic measurement." July 26, 2016. Full Text
  - Kolmasova, I, Santolik, O, Farges, T, Cummer, S, Lan, R, and Uhlir, L. "Propagation of preliminary breakdown pulses preceding cloud-to-ground lightning discharges." October 21, 2015. Full Text
  - Popa, BI, and Cummer, SA. "Unified approach to design linear and nonlinear acoustic metamaterials." November 5, 2014. Full Text
  - Barrett, JP, and Cummer, SA. "Roadmap to electrically self-tuning metamaterials: Design and experimental validation." January 1, 2014. Full Text
  - Barrett, JP, and Cummer, SA. "Design and realization of transistor-embedded active RF metamaterials." January 1, 2014. Full Text
  - Cummer, SA, Briggs, MS, Connaughton, V, Xiong, S, Fishman, GJ, and Dwyer, JR. "Charge motion and altitude of terrestrial gamma-ray flashes." January 1, 2014. Full Text
  - Katko, AR, and Cummer, SA. "Transistor-embedded acousto-optic and nonlinear metamaterials." January 1, 2014. Full Text
  - Lu, G, and Cummer, SA. "Implications of lightning emissions for terrestrial gamma-ray flashes and associated lightning discharges." January 1, 2014. Full Text
  - Lu, G, and Cummer, SA. "Negative sprites produced by consecutive impulse charge transfers in negative strokes." January 1, 2014. Full Text
  - Qin, J, Celestin, S, Pasko, VP, Cummer, SA, McHarg, MG, and Stenbaek-Nielsen, HC. "Mechanisms of sprite initiation, morphology, and lightning polarity asymmetry." January 1, 2014. Full Text
  - Weinert, JL, and Cummer, SA. "Measurement of sensitive current and charge motion using coherent averaging of remote low frequency magnetic field observations." January 1, 2014. Full Text
  - Zigoneanu, L, Popa, B-I, Cummer, SA, and ASME, . "SOUND MANIPULATION WITH ACOUSTIC METAMATERIALS." 2013. Link to Item
  - Barrett, JP, and Cummer, SA. "Active nonlinear metamaterials loaded with negative differential resistance elements and circuits." 2012. Full Text Link to Item
  - Katko, AR, Hawkes, AM, and Cummer, SA. "Nonlinear and active RF metamaterial applications using embedded devices." 2012. Full Text Link to Item
  - Cummer, SA. "Active and Tunable RF Metamaterials." 2008. Link to Item
  - Popa, B-I, Cummer, SA, and IEEE, . "Design and experimental demonstration of active RE metamaterials." 2007. Link to Item
  - Brown, A, Ybarra, G, Massoud, H, Board, J, Holmes, J, Coonley, K, Collins, L, Huettel, L, Gustafson, M, and Cummer, S. "Redesign of the core curriculum at Duke University." January 1, 2006.
  - Brown, A, Ybarra, G, Massoud, H, Board, J, Holmes, J, Coonley, K, Collins, L, Huettel, L, Gustafson, M, and Cummer, S. "Redesign of the core curriculum at Duke University." 2006.
  - Cummer, SA. "Measurements of lightning parameters from remote electromagnetic fields." 2006. Link to Item
  - Collins, LM, Huettel, LG, Brown, AS, Ybarra, GA, Holmes, JS, Board, JA, Cummer, SA, Gustafson, MR, Kim, J, and Massoud, HZ. "Theme-based redesign of the duke university ECE curriculum: The first steps." 2005.
  - Cummer, SA, Green, JL, Reinisch, BW, Fung, SF, Kaiser, ML, Pickett, JS, Christopher, I, Mutel, R, Gurnett, DA, and Escoubet, CP. "Advances in magnetospheric radio wave analysis and tomography." 2003. Full Text Link to Item
  - Cummer, SA, Vondrak, RR, Pfaff, RF, Gjerloev, JW, Carlson, CW, Ergun, RE, Peria, WJ, Elphic, RC, Strangeway, RJ, Sigwarth, JB, and Frank, LA. "Auroral surge currents and electrodynamics with FAST and VIS." 2000. Link to Item
  - Gjerloev, JW, Friis-Christensen, EF, Hoffman, RA, and Cummer, SA. "The Harang discontinuity in auroral substorms." 2000. Link to Item
- Journal Articles
  - Mezentsev, A, Lehtinen, N, Østgaard, N, Pérez-Invernón, FJ, and Cummer, SA. "Spectral Characteristics of VLF Sferics Associated With RHESSI TGFs." Journal of Geophysical Research: Atmospheres 123, no. 1 (January 16, 2018): 139-159. Full Text
  - Jia, Z, Li, J, Shen, C, Xie, Y, and Cummer, SA. "Systematic design of broadband path-coiling acoustic metamaterials." Journal of Applied Physics 123, no. 2 (January 14, 2018). Full Text
  - Fu, Y, Xu, Y, Chen, H, and Cummer, SA. "Coherent perfect absorption and laser modes in a cylindrical structure of conjugate metamaterials." New Journal of Physics 20, no. 1 (January 1, 2018). Full Text
  - Lyu, F, Cummer, SA, Krehbiel, PR, Rison, W, Briggs, MS, Cramer, E, Roberts, O, and Stanbro, M. "Very High Frequency Radio Emissions Associated With the Production of Terrestrial Gamma-Ray Flashes (Accepted)." Geophysical Research Letters (January 1, 2018). Full Text
  - Singh, R, Maurya, AK, Chanrion, O, Neubert, T, Cummer, SA, Mlynarczyk, J, Cohen, MB, Siingh, D, and Kumar, S. "Assessment of Unusual Gigantic Jets observed during the Monsoon season: First observations from Indian Subcontinent." Scientific reports 7, no. 1 (November 27, 2017): 16436-. Full Text
  - Bowers, GS, Smith, DM, Martinez-McKinney, GF, Kamogawa, M, Cummer, SA, Dwyer, JR, Wang, D, Stock, M, and Kawasaki, Z. "Gamma Ray Signatures of Neutrons From a Terrestrial Gamma Ray Flash." Geophysical Research Letters 44, no. 19 (October 16, 2017): 10,063-10,070. Full Text
  - Fu, Y, Cao, Y, Cummer, SA, Xu, Y, and Chen, H. "Coherent perfect absorber and laser modes in purely imaginary metamaterials." Physical Review A 96, no. 4 (October 2017). Full Text
  - Li, Y, Shen, C, Xie, Y, Li, J, Wang, W, Cummer, SA, and Jing, Y. "Tunable Asymmetric Transmission via Lossy Acoustic Metasurfaces." Physical review letters 119, no. 3 (July 18, 2017): 035501-. Full Text
  - Xie, Y, Ye, S, Reyes, C, Sithikong, P, Popa, B-I, Wiley, BJ, and Cummer, SA. "Microwave metamaterials made by fused deposition 3D printing of a highly conductive copper-based filament." Applied Physics Letters 110, no. 18 (May 2017): 181903-181903. Full Text
  - Carvalho, FL, Uman, MA, Jordan, DM, Hill, JD, Cummer, SA, Kotovsky, DA, and Moore, RC. "Triggered lightning sky waves, return stroke modeling, and ionosphere effective height." Journal of Geophysical Research: Atmospheres (2017). Full Text
  - Lu, G, Cummer, SA, Chen, AB, Lyu, F, Li, D, Liu, F, Hsu, R-R, and Su, H-T. "Analysis of lightning strokes associated with sprites observed by ISUAL in the vicinity of North America." Terrestrial, Atmospheric and Oceanic Sciences 28, no. 4 (2017): 583-583. Full Text
  - Wang, W, Xie, Y, Popa, B-I, and Cummer, SA. "Subwavelength diffractive acoustics and wavefront manipulation with a reflective acoustic metasurface." Journal of Applied Physics 120, no. 19 (November 21, 2016): 195103-195103. Full Text
  - Xie, Y, Shen, C, Wang, W, Li, J, Suo, D, Popa, B-I, Jing, Y, and Cummer, SA. "Acoustic Holographic Rendering with Two-dimensional Metamaterial-based Passive Phased Array." Scientific reports 6 (October 14, 2016): 35437-. Full Text
  - Li, J, Wang, W, Xie, Y, Popa, B-I, and Cummer, SA. "A sound absorbing metasurface with coupled resonators." Applied Physics Letters 109, no. 9 (August 29, 2016): 091908-091908. Full Text
  - Lyu, F, Cummer, SA, Briggs, M, Marisaldi, M, Blakeslee, RJ, Bruning, E, Wilson, JG, Rison, W, Krehbiel, P, Lu, G, Cramer, E, Fitzpatrick, G, Mailyan, B, McBreen, S, Roberts, OJ, and Stanbro, M. "Ground detection of terrestrial gamma ray flashes from distant radio signals." Geophysical Research Letters 43, no. 16 (August 28, 2016): 8728-8734. Full Text
  - Lang, TJ, Lyons, WA, Cummer, SA, Fuchs, BR, Dolan, B, Rutledge, SA, Krehbiel, P, Rison, W, Stanley, M, and Ashcraft, T. "Observations of two sprite-producing storms in Colorado." Journal of Geophysical Research: Atmospheres 121, no. 16 (August 27, 2016): 9675-9695. Full Text
  - Barrett, JP, Katko, AR, and Cummer, SA. "Transistor-based metamaterials with dynamically tunable nonlinear susceptibility." Applied Physics Letters 109, no. 6 (August 8, 2016): 061901-061901. Full Text
  - Mezentsev, A, Østgaard, N, Gjesteland, T, Albrechtsen, K, Lehtinen, N, Marisaldi, M, Smith, D, and Cummer, S. "Radio emissions from double RHESSI TGFs." Journal of Geophysical Research: Atmospheres 121, no. 13 (July 16, 2016): 8006-8022. Full Text
  - Hare, BM, Uman, MA, Dwyer, JR, Jordan, DM, Biggerstaff, MI, Caicedo, JA, Carvalho, FL, Wilkes, RA, Kotovsky, DA, Gamerota, WR, Pilkey, JT, Ngin, TK, Moore, RC, Rassoul, HK, Cummer, SA, Grove, JE, Nag, A, Betten, DP, and Bozarth, A. "Ground-level observation of a terrestrial gamma ray flash initiated by a triggered lightning." Journal of Geophysical Research: Atmospheres 121, no. 11 (June 16, 2016): 6511-6533. Full Text
  - Popa, B-I, Wang, W, Konneker, A, Cummer, SA, Rohde, CA, Martin, TP, Orris, GJ, and Guild, MD. "Anisotropic acoustic metafluid for underwater operation." The Journal of the Acoustical Society of America 139, no. 6 (June 2016): 3325-. Full Text
  - Shen, C, Xie, Y, Li, J, Cummer, SA, and Jing, Y. "Asymmetric acoustic transmission through near-zero-index and gradient-index metasurfaces." Applied Physics Letters 108, no. 22 (May 30, 2016): 223502-223502. Full Text
  - Lyu, F, Cummer, SA, Lu, G, Zhou, X, and Weinert, J. "Imaging lightning intracloud initial stepped leaders by low-frequency interferometric lightning mapping array." Geophysical Research Letters 43, no. 10 (May 28, 2016): 5516-5523. Full Text
  - Lu, G, Cummer, SA, Tian, Y, Zhang, H, Lyu, F, Wang, T, Stanley, MA, Yang, J, and Lyons, WA. "Sprite produced by consecutive impulse charge transfers following a negative stroke: Observation and simulation." Journal of Geophysical Research: Atmospheres 121, no. 8 (April 27, 2016): 4082-4092. Full Text
  - Popa, B-I, and Cummer, SA. "Preserving omnidirectionality in optimized asymmetric transformation optics designs." Journal of Optics 18, no. 4 (April 1, 2016): 044018-044018. Full Text
  - Liu, N, Boggs, LD, and Cummer, SA. "Observation-constrained modeling of the ionospheric impact of negative sprites." Geophysical Research Letters 43, no. 6 (March 28, 2016): 2365-2373. Full Text
  - Cummer, SA, Christensen, J, and Alù, A. "Controlling sound with acoustic metamaterials." Nature Reviews Materials 1, no. 3 (February 16, 2016): 16001-16001. Full Text
  - Kolmašová, I, Santolík, O, Farges, T, Cummer, SA, Lán, R, and Uhlíř, L. "Subionospheric propagation and peak currents of preliminary breakdown pulses before negative cloud-to-ground lightning discharges." Geophysical Research Letters 43, no. 3 (February 16, 2016): 1382-1391. Full Text
  - Boggs, LD, Liu, N, Splitt, M, Lazarus, S, Glenn, C, Rassoul, H, and Cummer, SA. "An analysis of five negative sprite-parent discharges and their associated thunderstorm charge structures." Journal of Geophysical Research: Atmospheres 121, no. 2 (January 27, 2016): 759-784. Full Text
  - Barrett, JP, Katko, AR, and Cummer, SA. "BANDWIDTH TUNING IN TRANSISTOR EMBEDDED METAMATERIALS USING VARIABLE RESISTANCE." Progress In Electromagnetics Research 157 (2016): 49-61. Full Text
  - Xu, L, Chen, H, Tyc, T, Xie, Y, and Cummer, SA. "Perfect conformal invisible device with feasible refractive indexes." Physical Review B 93, no. 4 (January 2016). Full Text
  - McTague, LE, Cummer, SA, Briggs, MS, Connaughton, V, Stanbro, M, and Fitzpatrick, G. "A lightning-based search for nearby observationally dim terrestrial gamma ray flashes." Journal of Geophysical Research: Atmospheres 120, no. 23 (December 16, 2015): 12,003-12,017. Full Text
  - Shen, C, Xie, Y, Sui, N, Wang, W, Cummer, SA, and Jing, Y. "Broadband Acoustic Hyperbolic Metamaterial." Physical review letters 115, no. 25 (December 16, 2015): 254301-. Full Text
  - Barrett, JP, and Cummer, SA. "Design and Full Characterization of Planar Active Magnetic RF Metamaterials." IEEE Antennas and Wireless Propagation Letters 14 (December 2015): 943-946. Full Text
  - Somu, VB, Rakov, VA, Haddad, MA, and Cummer, SA. "A study of changes in apparent ionospheric reflection height within individual lightning flashes." Journal of Atmospheric and Solar-Terrestrial Physics 136 (December 2015): 66-79. Full Text
  - Cummer, SA, Lyu, F, Briggs, MS, Fitzpatrick, G, Roberts, OJ, and Dwyer, JR. "Lightning leader altitude progression in terrestrial gamma-ray flashes." Geophysical Research Letters 42, no. 18 (September 28, 2015): 7792-7798. Full Text
  - Lyu, F, Cummer, SA, and McTague, L. "Insights into high peak current in-cloud lightning events during thunderstorms." Geophysical Research Letters 42, no. 16 (August 28, 2015): 6836-6843. Full Text
  - Xie, Y, Tsai, T-H, Konneker, A, Popa, B-I, Brady, DJ, and Cummer, SA. "Single-sensor multispeaker listening with acoustic metamaterials." Proceedings of the National Academy of Sciences of the United States of America 112, no. 34 (August 10, 2015): 10595-10598. Full Text
  - Qin, J, Pasko, VP, Celestin, S, Cummer, SA, McHarg, MG, and Stenbaek-Nielsen, HC. "Effects of Phosphor Persistence on High-Speed Imaging of Transient Luminous Events." IEEE Transactions on Plasma Science 43, no. 8 (August 2015): 2738-2742. Full Text
  - Popa, B-I, Shinde, D, Konneker, A, and Cummer, SA. "Active acoustic metamaterials reconfigurable in real time." Physical Review B 91, no. 22 (June 2015). Full Text
  - Lang, TJ, Cummer, SA, Petersen, D, Flores-Rivera, L, Lyons, WA, MacGorman, D, and Beasley, W. "Large charge moment change lightning on 31 May to 1 June 2013, including the El Reno tornadic storm." Journal of Geophysical Research: Atmospheres 120, no. 8 (April 27, 2015): 3354-3369. Full Text
  - Popa, B-I, and Cummer, SA. "Water-based metamaterials: Negative refraction of sound." Nature materials 14, no. 4 (April 2015): 363-364. Full Text
  - Liu, N, Spiva, N, Dwyer, JR, Rassoul, HK, Free, D, and Cummer, SA. "Upward electrical discharges observed above Tropical Depression Dorian." Nature communications 6 (January 21, 2015): 5995-. Full Text
  - Cummer, SA. "Active and applied functional rf metamaterials." Springer Series in Materials Science 200 (January 1, 2015): 21-33. Full Text
  - Cummer, SA, Briggs, MS, Dwyer, JR, Xiong, S, Connaughton, V, Fishman, GJ, Lu, G, Lyu, F, and Solanki, R. "The source altitude, electric current, and intrinsic brightness of terrestrial gamma ray flashes." Geophysical Research Letters 41, no. 23 (December 16, 2014): 8586-8593. Full Text
  - Cummer, SA, Briggs, MS, Dwyer, JR, Xiong, S, Connaughton, V, Fishman, GJ, Lu, G, Lyu, F, and Solanki, R. "The source altitude, electric current, and intrinsic brightness of terrestrial gamma ray flashes." Geophysical Research Letters 41, no. 23 (December 16, 2014): 8586-8593. Full Text
  - Lyu, F, Cummer, SA, Solanki, R, Weinert, J, McTague, L, Katko, A, Barrett, J, Zigoneanu, L, Xie, Y, and Wang, W. "A low-frequency near-field interferometric-TOA 3-D Lightning Mapping Array." Geophysical Research Letters 41, no. 22 (November 28, 2014): 7777-7784. Full Text
  - Beavis, NK, Lang, TJ, Rutledge, SA, Lyons, WA, and Cummer, SA. "Regional, Seasonal, and Diurnal Variations of Cloud-to-Ground Lightning with Large Impulse Charge Moment Changes." Monthly Weather Review 142, no. 10 (October 2014): 3666-3682. Full Text
  - Wang, W, Xie, Y, Konneker, A, Popa, B-I, and Cummer, SA. "Design and demonstration of broadband thin planar diffractive acoustic lenses." Applied Physics Letters 105, no. 10 (September 8, 2014): 101904-101904. Full Text
  - Liu, L, Katko, AR, Li, D, and Cummer, SA. "Broadband electromagnetic metamaterials with reconfigurable fluid channels." Physical Review B 89, no. 24 (June 2014). Full Text
  - Katko, AR, Barrett, JP, and Cummer, SA. "Time-varying transistor-based metamaterial for tunability, mixing, and efficient phase conjugation." Journal of Applied Physics 115, no. 14 (April 14, 2014): 144501-144501. Full Text
  - Xie, Y, Konneker, A, Popa, BI, and Cummer, SA. "Tapered labyrinthine acoustic metamaterials for coherent controlling of acoustic wave." The Journal of the Acoustical Society of America 135, no. 4 (April 2014): 2222-. Full Text
  - Xie, Y, Tsai, TH, Brady, DJ, and Cummer, SA. "Compressive acoustic imaging with metamaterials." The Journal of the Acoustical Society of America 135, no. 4 (April 2014): 2394-. Full Text
  - Zigoneanu, L, Popa, B-I, and Cummer, SA. "Three-dimensional broadband omnidirectional acoustic ground cloak." Nature materials 13, no. 4 (April 2014): 352-355. (Letter) Full Text Open Access Copy
  - Beavis, NK, Lang, TJ, Rutledge, SA, Lyons, WA, and Cummer, SA. "Regional, seasonal, and diurnal variations of cloud-to-ground lightning with large impulse charge moment changes." Monthly Weather Review 142, no. 10 (January 1, 2014): 3666-3682. Full Text
  - Cummer, SA. "Applied physics. Selecting the direction of sound transmission." Science (New York, N.Y.) 343, no. 6170 (January 2014): 495-496. Full Text
  - Popa, B-I, and Cummer, SA. "Non-reciprocal and highly nonlinear active acoustic metamaterials." Nature communications 5 (January 2014): 3398-. Full Text
  - Xie, Y, Wang, W, Chen, H, Konneker, A, Popa, B-I, and Cummer, SA. "Wavefront modulation and subwavelength diffractive acoustics with an acoustic metasurface." Nature communications 5 (January 2014): 5553-. Full Text
  - Yaniv, R, Yair, Y, Price, C, Bór, J, Sato, M, Hobara, Y, Cummer, S, Li, J, and Devir, A. "Ground-based observations of the relations between lightning charge-moment-change and the physical and optical properties of column sprites." Journal of Atmospheric and Solar-Terrestrial Physics 107 (January 1, 2014): 60-67. Full Text
  - Zigoneanu, L, Popa, B-I, and Cummer, SA. "Three-dimensional broadband omnidirectional acoustic ground cloak." Nature Materials 13, no. 4 (2014): 352-355. Full Text
  - Katko, AR, and Cummer, SA. "Functional metamaterials for wireless phase conjugation." CLEO: QELS_Fundamental Science, CLEO:QELS FS 2013 (November 21, 2013).
  - Xie, Y, Konneker, A, Popa, B-I, and Cummer, SA. "Tapered labyrinthine acoustic metamaterials for broadband impedance matching." APPLIED PHYSICS LETTERS 103, no. 20 (November 11, 2013). Full Text Link to Item
  - Hawkes, AM, Katko, AR, and Cummer, SA. "A microwave metamaterial with integrated power harvesting functionality." APPLIED PHYSICS LETTERS 103, no. 16 (October 14, 2013). Full Text Open Access Copy Link to Item
  - Qin, J, Celestin, S, Pasko, VP, Cummer, SA, McHarg, MG, and Stenbaek-Nielsen, HC. "Mechanism of column and carrot sprites derived from optical and radio observations." Geophysical Research Letters 40, no. 17 (September 16, 2013): 4777-4782. Full Text
  - Lang, TJ, Cummer, SA, Rutledge, SA, and Lyons, WA. "The meteorology of negative cloud-to-ground lightning strokes with large charge moment changes: Implications for negative sprites." JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 118, no. 14 (July 27, 2013): 7886-7896. Full Text Link to Item
  - Popa, B-I, Zigoneanu, L, and Cummer, SA. "Tunable active acoustic metamaterials." PHYSICAL REVIEW B 88, no. 2 (July 16, 2013). Full Text Link to Item
  - Lu, G, Cummer, SA, Li, J, Zigoneanu, L, Lyons, WA, Stanley, MA, Rison, W, Krehbiel, PR, Edens, HE, Thomas, RJ, Beasley, WH, Weiss, SA, Blakeslee, RJ, Bruning, EC, MacGorman, DR, Meyer, TC, Palivec, K, Ashcraft, T, and Samaras, T. "Coordinated observations of sprites and in-cloud lightning flash structure." JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 118, no. 12 (June 27, 2013): 6607-6632. Full Text Link to Item
  - Meyer, TC, Lang, TJ, Rutledge, SA, Lyons, WA, Cummer, SA, Lu, G, and Lindsey, DT. "Radar and lightning analyses of gigantic jet-producing storms." JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 118, no. 7 (April 16, 2013): 2872-2888. Full Text Link to Item
  - Cummer, SA, Lyons, WA, and Stanley, MA. "Three years of lightning impulse charge moment change measurements in the United States." Journal of Geophysical Research: Atmospheres 118, no. 11 (2013): 5176-5189. Full Text
  - Dwyer, JR, and Cummer, SA. "Radio emissions from terrestrial gamma-ray flashes." Journal of Geophysical Research: Space Physics 118, no. 6 (2013): 3769-3790. Full Text
  - Katko, AR, and Cummer, SA. "Functional metamaterials for wireless phase conjugation." 2013 Conference on Lasers and Electro-Optics, CLEO 2013 (January 1, 2013).
  - Marshall, T, Stolzenburg, M, Karunarathne, S, Cummer, S, Lu, G, Betz, H-D, Briggs, M, Connaughton, V, and Xiong, S. "Initial breakdown pulses in intracloud lightning flashes and their relation to terrestrial gamma ray flashes." Journal of Geophysical Research D: Atmospheres 118, no. 19 (2013): 10907-10925. Full Text
  - Østgaard, N, Gjesteland, T, Carlson, BE, Collier, AB, Cummer, SA, Lu, G, and Christian, HJ. "Simultaneous observations of optical lightning and terrestrial gamma ray flash from space." Geophysical Research Letters 40, no. 10 (2013): 2423-2426. Full Text
  - Zigoneanu, L, Popa, BI, and Cummer, SA. "Sound manipulation with acoustic metamaterials." 41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012 2 (December 1, 2012): 1555-1562.
  - Li, D, Zigoneanu, L, Popa, B-I, and Cummer, SA. "Design of an acoustic metamaterial lens using genetic algorithms." J Acoust Soc Am 132, no. 4 (October 2012): 2823-2833. Full Text Link to Item
  - Dwyer, JR, Smith, DM, and Cummer, SA. "High-energy atmospheric physics: Terrestrial gamma-ray flashes and related phenomena." Space Science Reviews 173, no. 1-4 (2012): 133-196. Full Text
  - Haddad, MA, Rakov, VA, and Cummer, SA. "New measurements of lightning electric fields in Florida: Waveform characteristics, interaction with the ionosphere, and peak current estimates." Journal of Geophysical Research: Atmospheres 117, no. 10 (2012). Full Text
  - Hager, WW, Sonnenfeld, RG, Feng, W, Kanmae, T, Stenbaek-Nielsen, HC, McHarg, MG, Haaland, RK, Cummer, SA, Lu, G, and Lapierre, JL. "Charge rearrangement by sprites over a north Texas mesoscale convective system." Journal of Geophysical Research: Atmospheres 117, no. 22 (2012). Full Text
  - Katko, AR, Shvets, G, and Cummer, SA. "Phase conjugation metamaterials: Particle design and imaging experiments." Journal of Optics (United Kingdom) 14, no. 11 (2012). Full Text
  - Li, J, Cummer, S, Lu, G, and Zigoneanu, L. "Charge moment change and lightning-driven electric fields associated with negative sprites and halos." Journal of Geophysical Research: Space Physics 117, no. 9 (2012). Full Text
  - Li, J, and Cummer, S. "Relationship between sprite streamer behavior and lightning-driven electric fields." Journal of Geophysical Research: Space Physics 117, no. 1 (2012). Full Text
  - Lu, G, Cummer, SA, Blakeslee, RJ, Weiss, S, and Beasley, WH. "Lightning morphology and impulse charge moment change of high peak current negative strokes." Journal of Geophysical Research: Atmospheres 117, no. 4 (2012). Full Text
  - Popa, B-I, and Cummer, SA. "Nonreciprocal active metamaterials." Physical Review B - Condensed Matter and Materials Physics 85, no. 20 (2012). Full Text
  - Thompson, RT, and Cummer, SA. "Transformation optics." Advances in Imaging and Electron Physics 171 (2012): 195-295. Full Text
  - Popa, B-I, Zigoneanu, L, and Cummer, SA. "Experimental acoustic ground cloak in air." Phys Rev Lett 106, no. 25 (June 24, 2011): 253901-. Full Text Link to Item
  - Cummer, SA, Lu, G, Briggs, MS, Connaughton, V, Xiong, S, Fishman, GJ, and Dwyer, JR. "The lightning-TGF relationship on microsecond timescales." Geophysical Research Letters 38, no. 14 (2011). Full Text
  - Cummer, SA, Lu, G, Li, J, Blakeslee, RJ, Smith, DM, Dwyer, JR, Briggs, MS, Connaughton, V, and Fishman, GJ. "Detailed observations of lightning flashes and processes associated with terrestrial gamma ray flashes." 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 (2011). Full Text
  - Cummer, SA, Lu, G, Li, J, Lyons, WA, Beasley, WH, MacGorman, DR, Krehbiel, PR, Rison, W, Cohen, MB, Velde, OVD, Lang, TJ, and Rutledge, SA. "Observations of lightning flash development associated with gigantic jets." 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 (2011). Full Text
  - Cummer, SA, Popa, B-I, and Katko, A. "Powered and active RF metamaterials." 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 (2011). Full Text
  - Cummer, SA, and Thompson, RT. "Frequency conversion by exploiting time in transformation optics." Journal of Optics 13, no. 2 (2011). Full Text
  - Gamerota, WR, Cummer, SA, Li, J, Stenbaek-Nielsen, HC, Haaland, RK, and McHarg, MG. "Comparison of sprite initiation altitudes between observations and models." Journal of Geophysical Research: Space Physics 116, no. 2 (2011). Full Text
  - Han, F, Cummer, SA, Li, J, and Lu, G. "Daytime ionospheric D region sharpness derived from VLF radio atmospherics." Journal of Geophysical Research: Space Physics 116, no. 5 (2011). Full Text
  - Katko, AR, Hawkes, AM, Barrett, JP, and Cummer, SA. "RF limiter metamaterial using p-i-n diodes." IEEE Antennas and Wireless Propagation Letters 10 (2011): 1571-1574. Full Text
  - Katko, AR, Popa, B-I, Barrett, JP, Hawkes, AM, and Cummer, SA. "Powered and nonlinear RF metamaterials." Proceedings of SPIE - The International Society for Optical Engineering 8093 (2011). Full Text
  - Lang, TJ, Li, J, Lyons, WA, Cummer, SA, Rutledge, SA, and MacGorman, DR. "Transient luminous events above two mesoscale convective systems: Charge moment change analysis." Journal of Geophysical Research: Space Physics 116, no. 10 (2011). Full Text
  - Li, J, and Cummer, S. "Estimation of electric charge in sprites from optical and radio observations." Journal of Geophysical Research: Space Physics 116, no. 1 (2011). Full Text
  - Lu, G, Cummer, SA, Li, J, Han, F, Smith, DM, and Grefenstette, BW. "Characteristics of broadband lightning emissions associated with terrestrial gamma ray flashes." Journal of Geophysical Research: Space Physics 116, no. 3 (2011). Full Text
  - Lu, G, Cummer, SA, Lyons, WA, Krehbiel, PR, Li, J, Rison, W, Thomas, RJ, Edens, HE, Stanley, MA, Beasley, W, MacGorman, DR, Velde, OAVD, Cohen, MB, Lang, TJ, and Rutledge, SA. "Lightning development associated with two negative gigantic jets." Geophysical Research Letters 38, no. 12 (2011). Full Text
  - Neubert, T, Chanrion, O, Arnone, E, Zanotti, F, Cummer, S, Li, J, Füllekrug, M, Soula, S, and Velde, OVD. "The properties of a gigantic jet reflected in a simultaneous sprite: Observations interpreted by a model." Journal of Geophysical Research: Space Physics 116, no. 12 (2011). Full Text
  - Popa, B-I, and Cummer, SA. "Homogeneous and compact acoustic ground cloaks." Physical Review B - Condensed Matter and Materials Physics 83, no. 22 (2011). Full Text
  - Popa, B-I, and Cummer, SA. "Complex coordinates in transformation optics." Physical Review A - Atomic, Molecular, and Optical Physics 84, no. 6 (2011). Full Text
  - Smith, DM, Dwyer, JR, Hazelton, BJ, Grefenstette, BW, Martinez-Mckinney, GFM, Zhang, ZY, Lowell, AW, Kelley, NA, Splitt, ME, Lazarus, SM, Ulrich, W, Schaal, M, Saleh, ZH, Cramer, E, Rassoul, H, Cummer, SA, Lu, G, Shao, X-M, Ho, C, Hamlin, T, Blakeslee, RJ, and Heckman, S. "A terrestrial gamma ray flash observed from an aircraft." Journal of Geophysical Research: Atmospheres 116, no. 20 (2011). Full Text
  - Smith, DM, Dwyer, JR, Hazelton, BJ, Grefenstette, BW, Martinez-Mckinney, GFM, Zhang, ZY, Lowell, AW, Kelley, NA, Splitt, ME, Lazarus, SM, Ulrich, W, Schaal, M, Saleh, ZH, Cramer, E, Rassoul, HK, Cummer, SA, Lu, G, and Blakeslee, RJ. "The rarity of terrestrial gamma-ray flashes." Geophysical Research Letters 38, no. 8 (2011). Full Text
  - Thompson, RT, Cummer, SA, and Frauendiener, J. "Generalized transformation optics of linear materials." Journal of Optics 13, no. 5 (2011). Full Text
  - Thompson, RT, Cummer, SA, and Frauendiener, J. "A completely covariant approach to transformation optics." Journal of Optics 13, no. 2 (2011). Full Text
  - Zhai, Y, Cummer, SA, Green, JL, Reinisch, BW, Kaiser, ML, Reiner, MJ, and Goetz, K. "Magnetospheric radio tomographic imaging with IMAGE and Wind." Journal of Geophysical Research: Space Physics 116, no. 12 (2011). Full Text
  - Zigoneanu, L, Popa, B-I, Starr, AF, and Cummer, SA. "Design and measurements of a broadband two-dimensional acoustic metamaterial with anisotropic effective mass density." Journal of Applied Physics 109, no. 5 (2011). Full Text
  - Zigoneanu, L, Popa, B-I, and Cummer, SA. "Design and measurements of a broadband two-dimensional acoustic lens." Physical Review B - Condensed Matter and Materials Physics 84, no. 2 (2011). Full Text
  - Katko, AR, Gu, S, Barrett, JP, Popa, B-I, Shvets, G, and Cummer, SA. "Phase conjugation and negative refraction using nonlinear active metamaterials." Phys Rev Lett 105, no. 12 (September 17, 2010): 123905-. Full Text Open Access Copy Link to Item
  - Chou, JK, Kuo, CL, Tsai, LY, Chen, AB, Su, HT, Hsu, RR, Cummer, SA, Li, J, Frey, HU, Mende, SB, Takahashi, Y, and Lee, LC. "Gigantic jets with negative and positive polarity streamers." JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 115 (July 15, 2010). Full Text Open Access Copy Link to Item
  - Thomas, JN, Solorzano, NN, Cummer, SA, and Holzworth, RH. "Polarity and energetics of inner core lightning in three intense North Atlantic hurricanes." JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 115 (March 12, 2010). Full Text Open Access Copy Link to Item
  - Cohen, MB, Inan, US, Said, RK, Briggs, MS, Fishman, GJ, Connaughton, V, and Cummer, SA. "A lightning discharge producing a beam of relativistic electrons into space." Geophysical Research Letters 37, no. 18 (2010). Full Text Open Access Copy
  - Cummer, SA. "Transformation acoustics." 17th International Congress on Sound and Vibration 2010, ICSV 2010 1 (2010): 197-202.
  - Gu, S, Barrett, JP, Hand, TH, Popa, B-I, and Cummer, SA. "A broadband low-reflection metamaterial absorber." Journal of Applied Physics 108, no. 6 (2010). Full Text Open Access Copy
  - Han, F, and Cummer, SA. "Midlatitude daytime D region ionosphere variations measured from radio atmospherics." Journal of Geophysical Research: Space Physics 115, no. 10 (2010). Full Text Open Access Copy
  - Han, F, and Cummer, SA. "Midlatitude nighttime D region ionosphere variability on hourly to monthly time scales." Journal of Geophysical Research: Space Physics 115, no. 9 (2010). Full Text Open Access Copy
  - Hand, TH, and Cummer, SA. "Reconfigurable reflectarray using addressable metamaterials." IEEE Antennas and Wireless Propagation Letters 9 (2010): 70-74. Full Text
  - Inan, US, Cummer, SA, and Marshall, RA. "A survey of ELF and VLF research on lightning-ionosphere interactions and causative discharges." Journal of Geophysical Research: Space Physics 115, no. 6 (2010). Full Text Open Access Copy
  - Lang, TJ, Lyons, WA, Rutledge, SA, Meyer, JD, MacGorman, DR, and Cummer, SA. "Transient luminous events above two mesoscale convective systems: Storm structure and evolution." Journal of Geophysical Research: Space Physics 115, no. 5 (2010). Open Access Copy
  - Lu, G, Blakeslee, RJ, Li, J, Smith, DM, Shao, X-M, McCaul, EW, Buechler, DE, Christian, HJ, Hall, JM, and Cummer, SA. "Lightning mapping observation of a terrestrial gamma-ray flash." Geophysical Research Letters 37, no. 11 (2010). Full Text Open Access Copy
  - Popa, B-I, and Cummer, SA. "Design of layered transformation-optics devices of arbitrary shape." Physical Review A - Atomic, Molecular, and Optical Physics 82, no. 3 (2010). Full Text Open Access Copy
  - Popa, B-L, and Cummer, SA. "Theory and design of practical metamaterials for acoustic cloaking." ASME International Mechanical Engineering Congress and Exposition, Proceedings 15 (2010): 113-114. Full Text
  - Rodger, CJ, Carson, BR, Cummer, SA, Gamble, RJ, Clilverd, MA, Green, JC, Sauvaud, J-A, Parrot, M, and Berthelier, J-J. "Contrasting the efficiency of radiation belt losses caused by ducted and nonducted whistler-mode waves from ground-based transmitters." Journal of Geophysical Research: Space Physics 115, no. 12 (2010). Full Text Open Access Copy
  - Sabbas, FTS, Taylor, MJ, Pautet, P-D, Bailey, M, Cummer, S, Azambuja, RR, Santiago, JPC, Thomas, JN, Pinto, O, Solorzano, NN, Schuch, NJ, Freitas, SR, Ferreira, NJ, and Conforte, JC. "Observations of prolific transient luminous event production above a mesoscale convective system in Argentina during the Sprite2006 Campaign in Brazil." Journal of Geophysical Research: Space Physics 115, no. 11 (2010). Full Text Open Access Copy
  - Sajuyigbe, S, Ross, M, Geren, P, Cummer, SA, Tanielian, MH, and Smith, DR. "Wide angle impedance matching metamaterials for waveguide-fed phased-array antennas." IET Microwaves, Antennas and Propagation 4, no. 8 (2010): 1063-1072. Full Text
  - Velde, OAVD, Bór, J, Li, J, Cummer, SA, Arnone, E, Zanotti, F, Füllekrug, M, Haldoupis, C, Naitamor, S, and Farges, T. "Multi-instrumental observations of a positive gigantic jet produced by a winter thunderstorm in Europe." Journal of Geophysical Research: Atmospheres 115, no. 24 (2010). Full Text Open Access Copy
  - Williams, ER, Lyons, WA, Hobara, Y, Mushtak, VC, Asencio, N, Boldi, R, Bór, J, Cummer, SA, Greenberg, E, Hayakaw, M, Holzworth, RH, Kotroni, V, Li, J, Morales, C, Nelson, TE, Price, C, Russell, B, Sato, M, Sátori, G, Shirahata, K, Takahashio, Y, and Yamashitao, K. "Ground-based detection of sprites and their parent lightning flashes over Africa during the 2006 AMMA campaign." Quarterly Journal of the Royal Meteorological Society 136, no. SUPPL. 1 (2010): 257-271. Full Text
  - Ybarra, GA, Collins, LM, Huettel, LG, Coonley, KD, Massoud, HZ, Board, JA, Cummer, SA, Choudhury, RR, Gustafson, MR, Jokerst, NM, Brooke, MA, Willett, RM, Kim, J, and Absher, MS. "Integrated sensing and information processing theme-based redesign of the undergraduate electrical and computer engineering curriculum at Duke University." Advances in Engineering Education 2, no. 4 (2010).
  - Lyons, WA, Stanley, MA, Meyer, JD, Nelson, TE, Rutledge, SA, Lang, TL, and Cummer, SA. "The meteorological and electrical structure of TLE-producing convective storms." (December 1, 2009): 387-415. (Chapter) Full Text
  - Yuan, Y, Popa, B-I, and Cummer, SA. "Zero loss magnetic metamaterials using powered active unit cells." Opt Express 17, no. 18 (August 31, 2009): 16135-16143. Link to Item
  - Zhai, Y, and Cummer, SA. "Fast tomographic reconstruction strategy for diffuse optical tomography." Opt Express 17, no. 7 (March 30, 2009): 5285-5297. Link to Item
  - Adachi, T, Cummer, SA, Li, J, Takahashi, Y, Hsu, R-R, Su, H-T, Chen, AB, Mende, SB, and Frey, HU. "Estimating lightning current moment waveforms from satellite optical measurements." Geophysical Research Letters 36, no. 18 (2009). Full Text
  - Allen, J, Kundtz, N, Roberts, DA, Cummer, SA, and Smith, DR. "Electromagnetic source transformations using superellipse equations." Applied Physics Letters 94, no. 19 (2009). Full Text
  - Cummer, SA, Kundtz, N, and Popa, B-I. "Electromagnetic surface and line sources under coordinate transformations." Physical Review A - Atomic, Molecular, and Optical Physics 80, no. 3 (2009). Full Text
  - Cummer, SA, Li, J, Han, F, Lu, G, Jaugey, N, Lyons, WA, and Nelson, TE. "Quantification of the troposphere-to-ionosphere charge transfer in a gigantic jet." Nature Geoscience 2, no. 9 (2009): 617-620. Full Text
  - Cummer, SA, Liu, R, and Cui, TJ. "A rigorous and nonsingular two dimensional cloaking coordinate transformation." Journal of Applied Physics 105, no. 5 (2009). Full Text
  - Cummer, SA. "Electromagnetic source transformations and applications." IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) (2009). Full Text
  - Farrell, WM, Plaut, JJ, Cummer, SA, Gurnett, DA, Picardi, G, Watters, TR, and Safaeinili, A. "Is the Martian water table hidden from radar view?." Geophysical Research Letters 36, no. 15 (2009). Full Text
  - Hand, TH, and Cummer, SA. "Controllable magnetic metamaterial using digitally addressable split-ring resonators." IEEE Antennas and Wireless Propagation Letters 8 (2009): 262-265. Full Text
  - Hand, TH, and Cummer, SA. "A dynamic frequency selective surface using addressable metamaterials." IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) (2009). Full Text
  - Hazelton, BJ, Grefenstette, BW, Smith, DM, Dwyer, JR, Shao, X-M, Cummer, SA, Chronis, T, Lay, EH, and Holzworth, RH. "Spectral dependence of terrestrial gamma-ray flashes on source distance." Geophysical Research Letters 36, no. 1 (2009). Full Text
  - Kuo, C-L, Chou, JK, Tsai, LY, Chen, AB, Su, HT, Hsu, RR, Cummer, SA, Frey, HU, Mende, SB, Takahashi, Y, and Lee, LC. "Discharge processes, electric field, and electron energy in ISUAL recorded gigantic jets." Journal of Geophysical Research: Space Physics 114, no. 4 (2009). Full Text
  - Li, J, and Cummer, SA. "Measurement of sprite streamer acceleration and deceleration." Geophysical Research Letters 36, no. 10 (2009): L10812-. Full Text
  - Lu, G, Cummer, SA, Li, J, Han, F, Blakeslee, RJ, and Christian, HJ. "Charge transfer and in-cloud structure of large-charge-moment positive lightning strokes in a mesoscale convective system." Geophysical Research Letters 36, no. 15 (2009). Full Text
  - Popa, B-I, Allen, J, and Cummer, SA. "Conformal array design with transformation electromagnetics." Applied Physics Letters 94, no. 24 (2009). Full Text
  - Popa, B-I, and Cummer, SA. "Design and characterization of broadband acoustic composite metamaterials." Physical Review B - Condensed Matter and Materials Physics 80, no. 17 (2009). Full Text
  - Popa, B-I, and Cummer, SA. "Cloaking with optimized homogeneous anisotropic layers." Physical Review A - Atomic, Molecular, and Optical Physics 79, no. 2 (2009). Full Text
  - Sajuyigbe, S, Cummer, SA, and Smith, DR. "Utilization of metamaterials for wide angle impedance matching (WAIM) in phased array antennas." IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) (2009). Full Text
  - Kundtz, N, Roberts, DA, Allen, J, Cummer, S, and Smith, DR. "Optical source transformations." Opt Express 16, no. 26 (December 22, 2008): 21215-21222. Link to Item
  - Yuan, Y, Bingham, C, Tyler, T, Palit, S, Hand, TH, Padilla, WJ, Jokerst, NM, and Cummer, SA. "A dual-resonant terahertz metamaterial based on single-particle electric-field-coupled resonators." Applied Physics Letters 93, no. 19 (November 10, 2008): 191110-191110. Full Text
  - Hand, TH, Yu, Y, Palit, S, Bingham, C, Rahm, M, Smith, DR, Padilla, WJ, Jokerst, N, and Cummer, SA. "Dual-band planar electric THz metamaterial with resonator yield analysis." 2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS (September 15, 2008). Full Text
  - Hand, TH, Yuan, Y, Palit, S, Bingham, C, Rahm, M, Smith, DR, Padilla, WJ, Jokerst, N, and Cummer, SA. "Dual-band planar electric THz metamaterial with resonator yield analysis." Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series (September 15, 2008). Full Text
  - Yuan, Y, Bingham, C, Tyler, T, Palit, S, Hand, TH, Padilla, WJ, Smith, DR, Jokerst, NM, and Cummer, SA. "Dual-band planar electric metamaterial in the terahertz regime." Optics Express 16, no. 13 (June 2008): 9746-9752. Full Text
  - Popa, B-I, and Cummer, SA. "Compact dielectric particles as a building block for low-loss magnetic metamaterials." Phys Rev Lett 100, no. 20 (May 23, 2008): 207401-. Full Text Link to Item
  - Rahm, M, Cummer, SA, Schurig, D, Pendry, JB, and Smith, DR. "Optical design of reflectionless complex media by finite embedded coordinate transformations." Phys Rev Lett 100, no. 6 (February 15, 2008): 063903-. Full Text Link to Item
  - Cummer, SA, Popa, B-I, Schurig, D, Smith, DR, Pendry, J, Rahm, M, and Starr, A. "Scattering theory derivation of a 3D acoustic cloaking shell." Phys Rev Lett 100, no. 2 (January 18, 2008): 024301-. Full Text Link to Item
  - Liu, R, Cheng, Q, Hand, T, Mock, JJ, Cui, TJ, Cummer, SA, and Smith, DR. "Experimental demonstration of electromagnetic tunneling through an epsilon-near-zero metamaterial at microwave frequencies." Phys Rev Lett 100, no. 2 (January 18, 2008): 023903-. Full Text Link to Item
  - Cummer, SA, Popa, B-I, and Hand, TH. "Q-based design equations and loss limits for resonant metamaterials and experimental validation." IEEE Transactions on Antennas and Propagation 56, no. 1 (2008): 127-132. Full Text
  - Cummer, SA, Popa, BI, Schurig, D, Smith, DR, Pendry, J, Rahm, M, and Starr, A. "Scattering theory derivation of a 3D acoustic cloaking shell." Physical Review Letters 1, no. 2 (January 2008). (Academic Article)
  - Cummer, SA, Rahm, M, and Schurig, D. "Material parameters and vector scaling in transformation acoustics." New Journal of Physics 10 (2008). Full Text
  - Erentok, A, Ziolkowski, RW, Nielsen, JA, Greegor, RB, Parazzoli, CG, Tanielian, MH, Cummer, SA, Popa, B-I, Hand, T, Vier, DC, and Schultz, S. "Lumped element-based, highly sub-wavelength, negative index metamaterials at UHF frequencies." Journal of Applied Physics 104, no. 3 (2008). Full Text
  - Farrell, WM, Clifford, SM, Milkovich, SM, Plaut, JJ, Leuschen, CJ, Picardi, G, Gurnett, DA, Watters, TR, Safaeinili, A, Ivanov, AB, Phillips, RJ, Stofan, ER, Heggy, E, Cummer, SA, and Espley, JR. "MARSIS subsurface radar investigations of the South Polar reentrant Chasma Australe." Journal of Geophysical Research E: Planets 113, no. 4 (2008). Full Text
  - Hand, TH, Gollub, J, Sajuyigbe, S, Smith, DR, and Cummer, SA. "Characterization of complementary electric field coupled resonant surfaces." Applied Physics Letters 93, no. 21 (2008). Full Text
  - Hand, TH, Yuan, Y, Palit, S, Bingham, C, Rahm, M, Smith, DR, Padilla, WJ, Jokerst, N, and Cummer, SA. "Dual-band planar electric THz metamaterial with resonator yield analysis." Optics InfoBase Conference Papers (January 1, 2008).
  - Hand, TH, Yuan, Y, Palit, S, Bingham, C, Rahm, M, Smith, DR, Padilla, WJ, Jokerst, N, and Cummer, SA. "Dual-band planar electric THz metamaterial with resonator yield analysis." Optics InfoBase Conference Papers (January 1, 2008).
  - Hand, TH, and Cummer, SA. "Frequency tunable electromagnetic metamaterial using ferroelectric loaded split rings." Journal of Applied Physics 103, no. 6 (2008). Full Text
  - Li, J, Cummer, SA, Lyons, WA, and Nelson, TE. "Coordinated analysis of delayed sprites with high-speed images and remote electromagnetic fields." Journal of Geophysical Research: Atmospheres 113, no. 20 (2008). Full Text
  - Liu, R, Cheng, Q, Hand, T, Mock, JJ, Cui, TJ, Cummer, SA, and Smith, DR. "Experimental demonstration of electromagnetic tunneling through an epsilon-near-zero metamaterial at microwave frequencies." Physical Review Letters 1, no. 2 (January 2008). (Academic Article)
  - Lyons, WA, Cummer, SA, Stanley, MA, Huffines, GR, Wiens, KC, and Nelson, TE. "Supercelles and sprites." Bulletin of the American Meteorological Society 89, no. 8 (2008): 1165-1174. Full Text
  - Lyons, WA, Cummer, SA, Stanley, MA, Huffines, GR, Wiens, KC, and Nelson, TE. "Supercells and sprites." Journal of Atmospheric and Oceanic Technology 89, no. 8 (2008): 1165-1174. Full Text
  - Rahm, M, Schurig, D, Roberts, DA, Cummer, SA, Smith, DR, and Pendry, JB. "Design of electromagnetic cloaks and concentrators using form-invariant coordinate transformations of Maxwell's equations." Photonics and Nanostructures - Fundamentals and Applications 6, no. 1 (2008): 87-95. Full Text
  - Ross, M, Cummer, SA, Nielsen, TK, and Zhang, Y. "Simultaneous remote electric and magnetic field measurements of lightning continuing currents." Journal of Geophysical Research: Atmospheres 113, no. 20 (2008). Full Text
  - Taylor, MJ, Bailey, MA, Pautet, PD, Cummer, SA, Jaugey, N, Thomas, JN, Solorzano, NN, Sabbas, FS, Holzworth, RH, Pinto, O, and Schuch, NJ. "Rare measurements of a sprite with halo event driven by a negative lightning discharge over Argentina." Geophysical Research Letters 35, no. 14 (2008). Full Text
  - Kuo, C-L, Chen, AB, Lee, YJ, Tsai, LY, Chou, RK, Hsu, RR, Su, HT, Lee, LC, Cummer, SA, Frey, HU, Mende, SB, Takahashi, Y, and Fukunishi, H. "Modeling elves observed by FORMOSAT-2 satellite." JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 112, no. A11 (November 22, 2007). Full Text Link to Item
  - Cheng, Z, Cummer, SA, Su, H-T, and Hsu, R-R. "Broadband very low frequency measurement of D region ionospheric perturbations caused by lightning electromagnetic pulses." Journal of Geophysical Research: Space Physics 112, no. 6 (2007). Full Text
  - Cummer, SA, and Schurig, D. "One path to acoustic cloaking." New Journal of Physics 9 (2007). Full Text
  - Erentok, A, Ziolkowski, RW, Nielsen, JA, Greegor, RB, Parazzoli, CG, Tanielian, MH, Cummer, SA, Popa, B-I, Hand, T, Vier, DC, and Schultz, S. "Low frequency lumped element-based negative index metamaterial." Applied Physics Letters 91, no. 18 (2007). Full Text
  - Frey, HU, Mende, SB, Cummer, SA, Li, J, Adachi, T, Fukunishi, H, Takahashi, Y, Chen, AB, Hsu, R-R, Su, H-T, and Chang, Y-S. "Halos generated by negative cloud-to-ground lightning." Geophysical Research Letters 34, no. 18 (2007). Full Text
  - Gollub, J, Hand, T, Sajuyigbe, S, Mendonca, S, Cummer, S, and Smith, DR. "Characterizing the effects of disorder in metamaterial structures." Applied Physics Letters 91, no. 16 (2007). Full Text
  - Hand, T, Cummer, SA, and Engheta, N. "The measured electric field spatial distribution within a metamaterial subwavelength cavity resonator." IEEE Transactions on Antennas and Propagation 55, no. 6 II (2007): 1781-1788. Full Text
  - Hand, T, and Cummer, S. "Characterization of tunable metamaterial elements using MEMS switches." IEEE Antennas and Wireless Propagation Letters 6 (2007): 401-404. Full Text
  - Hu, W, Cummer, SA, and Lyons, WA. "Testing sprite initiation theory using lightning measurements and modeled electromagnetic fields." Journal of Geophysical Research: Atmospheres 112, no. 13 (2007). Full Text
  - Kuo, C-L, Chen, AB, Lee, YJ, Tsai, LY, Chou, RK, Hsu, RR, Su, HT, Lee, LC, Cummer, SA, Frey, HU, Mende, SB, Takahashi, Y, and Fukunishi, H. "Modeling elves observed by FORMOSAT-2 satellite." Journal of Geophysical Research: Space Physics 112, no. 11 (2007). Full Text
  - Parazzoli, CG, Greegor, RB, Tanielian, MH, Smith, DR, Cummer, S, Schurig, D, and Ziolkowski, R. "Applications of metamaterials in the GHz frequency domain." IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) (2007): 1152-1155. Full Text
  - Popa, B-I, and Cummer, SA. "An architecture for active metamaterial particles and experimental validation at RF." Microwave and Optical Technology Letters 49, no. 10 (2007): 2574-2577. Full Text
  - Popa, B-I, and Cummer, SA. "Design and experimental demonstration of active RF metamaterials." IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) (2007): 2546-2549. Full Text
  - Thomas, JN, Taylor, MJ, Pautet, D, Bailey, M, Solorzano, NN, Holzworth, RH, McCarthy, MP, Kokorowski, M, Sabbas, FS, Jr, OP, Cummer, SA, Jaugey, N, Li, J, and Schuch, NJ. "A very active sprite-producing storm observed over Argentina." Eos 88, no. 10 (2007): 117+119-.
  - Velde, OAVD, Lyons, WA, Nelson, TE, Cummer, SA, Li, J, and Bunnell, J. "Analysis of the first gigantic jet recorded over continental North America." Journal of Geophysical Research: Atmospheres 112, no. 20 (2007). Full Text
  - Schurig, D, Mock, JJ, Justice, BJ, Cummer, SA, Pendry, JB, Starr, AF, and Smith, DR. "Metamaterial electromagnetic cloak at microwave frequencies." Science 314, no. 5801 (November 10, 2006): 977-980. Full Text Link to Item
  - Cummer, SA, Popa, B-I, Schurig, D, Smith, DR, and Pendry, J. "Full-wave simulations of electromagnetic cloaking structures." Phys Rev E Stat Nonlin Soft Matter Phys 74, no. 3 Pt 2 (September 2006): 036621-. Full Text Link to Item
  - Atreya, SK, Wong, A-S, Renno, NO, Farrell, WM, Delory, GT, Sentman, DD, Cummer, SA, Marshall, JR, Rafkin, SCR, and Catling, DC. "Oxidant enhancement in martian dust devils and storms: implications for life and habitability." Astrobiology 6, no. 3 (June 2006): 439-450. Full Text Link to Item
  - Delory, GT, Farrell, WM, Atreya, SK, Renno, NO, Wong, A-S, Cummer, SA, Sentman, DD, Marshall, JR, Rafkin, SCR, and Catling, DC. "Oxidant enhancement in martian dust devils and storms: storm electric fields and electron dissociative attachment." Astrobiology 6, no. 3 (June 2006): 451-462. (Review) Full Text Link to Item
  - Cheng, Z, Cummer, SA, Baker, DN, and Kanekal, SG. "Nighttime D region electron density profiles and variabilities inferred from broadband measurements using VLF radio emissions from lightning." Journal of Geophysical Research: Space Physics 111, no. 5 (2006). Full Text
  - Cummer, SA, Frey, HU, Mende, SB, Hsu, R-R, Su, H-T, Chen, AB, Fukunishi, H, and Takahashi, Y. "Simultaneous radio and satellite optical measurements of high-altitude sprite current and lightning continuing current." Journal of Geophysical Research: Space Physics 111, no. 10 (2006). Full Text
  - Cummer, SA, Jaugey, N, Li, J, Lyons, WA, Nelson, TE, and Gerken, EA. "Submillisecond imaging of sprite development and structure." Geophysical Research Letters 33, no. 4 (2006). Full Text
  - Cummer, SA, Popa, B-I, Schurig, D, Smith, DR, and Pendry, J. "Full-wave simulations of electromagnetic cloaking structures." Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 74, no. 3 (2006). Full Text
  - Farrell, WM, Marshall, JR, Cummer, SA, Delory, GT, and Desch, MD. "A model of the ULF magnetic and electric field generated from a dust devil." Journal of Geophysical Research E: Planets 111, no. 11 (2006). Full Text
  - Farrell, WM, Renno, N, Delory, GT, Cummer, SA, and Marshall, JR. "Integration of electrostatic and fluid dynamics within a dust devil." Journal of Geophysical Research E: Planets 111, no. 1 (2006). Full Text
  - Hu, W, and Cummer, SA. "An FDTD model for low and high altitude lightning-generated EM fields." IEEE Transactions on Antennas and Propagation 54, no. 5 (2006): 1513-1522. Full Text
  - Popa, B-I, and Cummer, SA. "Direct measurement of evanescent wave enhancement inside passive metamaterials." Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 73, no. 1 (2006). Full Text
  - Popa, B-I, and Cummer, SA. "Direct measurement of evanescent wave enhancement inside passive metamaterials." Phys Rev E Stat Nonlin Soft Matter Phys 73, no. 1 Pt 2 (January 2006): 016617-. Full Text Link to Item
  - Xu, Y, Cummer, SA, and Farrell, WM. "Application of an orbital radar sounder model to detecting Martian polar subsurface features." Journal of Geophysical Research E: Planets 111, no. 6 (2006). Full Text
  - Zhai, Y, Cummer, SA, and Farrell, WM. "Quasi-electrostatic field analysis and simulation of Martian and terrestrial dust devils." Journal of Geophysical Research E: Planets 111, no. 6 (2006). Full Text
  - Zhai, Y, and Cummer, SA. "An orthogonal projection and regularization technique for magnetospheric radio tomography." Journal of Geophysical Research: Space Physics 111, no. 3 (2006). Full Text
  - Cheng, Z, and Cummer, SA. "Broadband VLF measurements of lightning-induced ionospheric perturbations." Geophysical Research Letters 32, no. 8 (2005): 1-4. Full Text
  - Cummer, SA, Zhai, Y, Hu, W, Smith, DM, Lopez, LI, and Stanley, MA. "Measurements and implications of the relationship between lightning and terrestrial gamma ray flashes." Geophysical Research Letters 32, no. 8 (2005): 1-5. Full Text
  - Cummer, SA, and Lyons, WA. "Implications of lightning charge moment changes for sprite initiation." Journal of Geophysical Research: Space Physics 110, no. A4 (2005). Full Text
  - Frey, HU, Mende, SB, Cummer, SA, Chen, AB, Hsu, R-R, Su, H-T, Chang, Y-S, Adachi, T, Fukunishi, H, and Takahashi, Y. "Beta-type stepped leader of elve-producing lightning." Geophysical Research Letters 32, no. 13 (2005): 1-4. Full Text
  - Lyons, WA, and Cummer, SA. "Lightning characteristics of the aurora, NE record hailstone-producing supercell of 22-23 June 2003 during BAMEX." 85th AMS Annual Meeting, American Meteorological Society - Combined Preprints (2005): 5685-5690.
  - Popa, B-I, and Cummer, SA. "Determining the effective electromagnetic properties of negative-refractive-index metamaterials from internal fields." Physical Review B - Condensed Matter and Materials Physics 72, no. 16 (2005). Full Text
  - Zhai, Y, and Cummer, SA. "A flexible and robust direct reconstruction method for magnetospheric radio tomography." Radio Science 40, no. 3 (2005): RS3004-RS3022. Full Text
  - Farrell, WM, Smith, PH, Delory, GT, Hillard, GB, Marshall, JR, Catling, D, Hecht, M, Tratt, DM, Renno, N, Desch, MD, Cummer, SA, Houser, JG, and Johnson, B. "Electric and magnetic signatures of dust devils from the 2000-2001 MATADOR desert tests." JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 109, no. E3 (March 5, 2004). Full Text Link to Item
  - Antunovic, M, and Cummer, SA. "Adaptive filter for event-based signal extraction." Automatika (Croatia) 45, no. 3-4 (2004): 129-135. (Academic Article)
  - Antunovic, M, and Cummer, SA. "Event driven adaptive filtering." Proceedings of the Mediterranean Electrotechnical Conference - MELECON 1 (2004): 251-254.
  - Cummer, SA, and Lyons, WA. "Lightning charge moment changes in U.S. High Plains thunderstorms." Geophysical Research Letters 31, no. 5 (2004): L05114 1-4-.
  - Cummer, SA, and Popa, B-L. "Wave fields measured inside a negative refractive index metamaterial." Applied Physics Letters 85, no. 20 (2004): 4564-4566. Full Text
  - Cummer, SA. "Perfectly matched layer behavior in negative refractive index materials." IEEE Antennas and Wireless Propagation Letters 3, no. 1 (2004): 172-175. Full Text
  - Farrell, WM, Smith, PH, Delory, GT, Hillard, GB, Marshall, JR, Catling, D, Hecht, M, Tratt, DM, Renno, N, Desch, MD, Cummer, SA, Houser, JG, and Johnson, B. "Electric and magnetic signatures of dust devils from the 2000-2001 MATADOR desert tests." Journal of Geophysical Research E: Planets 109, no. 3 (2004): E03004 1-13-.
  - Hu, W, and Cummer, SA. "The nearly perfectly matched layer is a perfectly matched layer." IEEE Antennas and Wireless Propagation Letters 3, no. 1 (2004): 137-140. Full Text
  - Barros Ana, P, and Lang Timothy, J. "Monitoring the monsoon in the Himalayas: Observations in Central Nepal, June 2001." Monthly Weather Review 131, no. 7 (2003): 1408-1427. (Academic Article) Full Text Link to Item
  - Cummer, SA, Green, JL, Reinisch, BW, Fung, SF, Kaiser, ML, Pickett, JS, Christopher, I, Mutel, R, Gurnett, DA, and Escoubet, CP. "Advances in magnetospheric radio wave analysis and tomography." Advances in Space Research 32, no. 3 (2003): 329-336. Full Text
  - Cummer, SA. "Current moment in sprite-producing lightning." Journal of Atmospheric and Solar-Terrestrial Physics 65, no. 5 (2003): 499-508. Full Text
  - Cummer, SA. "Simulated causal subwavelength focusing by a negative refractive index slab." Applied Physics Letters 82, no. 10 (2003): 1503-1505. Full Text
  - Cummer, SA. "A simple, nearly perfectly matched layer for general electromagnetic media." IEEE Microwave and Wireless Components Letters 13, no. 3 (2003): 128-130. Full Text
  - Cummer, SA. "Dynamics of causal beam refraction in negative refractive index materials." Applied Physics Letters 82, no. 13 (2003): 2008-2010. Full Text
  - Farrell, WM, Delory, GT, Cummer, SA, and Marshall, JR. "A simple electrodynamic model of a dust devil." Geophysical Research Letters 30, no. 20 (2003): PLA 2-1 - PLA 2-4-.
  - Hu, W, and Cummer, SA. "A new FDTD model for lightning generated EM wave simulation." IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) 3 (2003): 1061-1064.
  - Lyons, WA, Nelson, TE, Williams, ER, Cummer, SA, and Stanley, MA. "Characteristics of sprite-producing positive cloud-to-ground lightning during the 19 July 2000 STEPS mesoscale convective systems." Monthly Weather Review 131, no. 10 (2003): 2417-2427. Full Text
  - Xu, Y, and Cummer, SA. "Applying the nonuniform FFT to the parabolic equation split-step algorithm for high frequency propagation modeling." IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) 2 (2003): 598-601.
  - Hu, W, Cummer, SA, Lyons, WA, and Nelson, TE. "Lightning charge moment changes for the initiation of sprites." Geophysical Research Letters 29, no. 8 (2002): 120-1 - 120-4-.
  - Cummer, SA, Reiner, MJ, Reinisch, BW, Kaiser, ML, Green, JL, Benson, RF, Manning, R, and Goetz, K. "A test magnetospheric radio tomographic imaging with IMAGE and WIND." Geophysical Research Letters 28, no. 6 (2001): 1131-1134. Full Text
  - Cummer, SA, and Füllekrug, M. "Unusually intense continuing current in lightning produces delayed mesospheric breakdown." Geophysical Research Letters 28, no. 3 (2001): 495-498. Full Text
  - Østgaard, N, Stadsnes, J, Bjordal, J, Germany, GA, Vondrak, RR, Parks, GK, Cummer, SA, Chenette, DL, and Pronko, JG. "Auroral electron distributions derived from combined UV and X-ray emissions." Journal of Geophysical Research: Space Physics 106, no. A11 (2001): 26081-26089.
  - Cummer, SA, Vondrak, RR, Ostgaard, N, Stadsnes, J, Bjordal, J, Chenette, DL, Brittnacher, MJ, Parks, GK, Sigwarth, JB, and Frank, LA. "Global multispectral auroral imaging of an isolated substorm." Geophysical Research Letters 27, no. 5 (March 1, 2000): 637-640. Full Text
  - Cummer, SA, Vondrak, RR, Ostgaard, N, Stadsnes, J, Bjordal, J, Chenette, DL, Brittnacher, MJ, Parks, GK, Sigwarth, JB, and Frank, LA. "Global multispectral auroral imaging of an isolated substorm." Geophysical Research Letters 27, no. 5 (2000): 637-640. Full Text
  - Cummer, SA, and Inan, US. "Ionospheric E region remote sensing with ELF radio atmospherics." Radio Science 35, no. 6 (2000): 1437-1444. Full Text
  - Cummer, SA, and Inan, US. "Modeling ELF radio atmospheric propagation and extracting lightning currents from ELF observations." Radio Science 35, no. 2 (2000): 385-394. Full Text
  - Cummer, SA. "Modeling electromagnetic propagation in the Earth-ionosphere waveguide." IEEE Transactions on Antennas and Propagation 48, no. 9 (2000): 1420-1429. Full Text
  - Stanley, M, Brook, M, Krehbiel, P, and Cummer, SA. "Detection of daytime sprites via a unique sprite ELF signature." Geophysical Research Letters 27, no. 6 (2000): 871-874. Full Text
  - Østgaard, N, Stadsnes, J, Bjordal, J, Vondrak, RR, Cummer, SA, Chenette, DL, Schulz, M, Parks, GK, Brittnacher, MJ, McKenzie, DL, and Pronko, JG. "Global X-ray emission during an isolated substorm - A case study." Journal of Atmospheric and Solar-Terrestrial Physics 62, no. 10 (2000): 889-900.
  - Østgaard, N, Stadsnes, J, Bjordal, J, Vondrak, RR, Cummer, SA, Chenette, DL, Schulz, M, and Pronko, JG. "Cause of the localized maximum of X-ray emission in the morning sector: A comparison with electron measurements." Journal of Geophysical Research: Space Physics 105, no. A9 (2000): 20869-20883.
  - Barrington-Leigh, CP, Inan, US, Stanley, M, and Cummer, SA. "Sprites triggered by negative lightning discharges." Geophysical Research Letters 26, no. 24 (1999): 3605-3608. Full Text
  - Cummer, SA, and Farrell, WM. "Radio atmospheric propagation on Mars and potential remote sensing applications." Journal of Geophysical Research E: Planets 104, no. E6 (1999): 14149-14157.
  - Cummer, SA, and Stanley, M. "Submillisecond resolution lightning currents and sprite development: Observations and implications." Geophysical Research Letters 26, no. 20 (1999): 3205-3208. Full Text
  - Farrell, WM, Kaiser, ML, Desch, MD, Houser, JG, Cummer, SA, Wilt, DM, and Landis, GA. "Detecting electrical activity from Martian dust storms." Journal of Geophysical Research E: Planets 104, no. E2 (1999): 3795-3801.
  - Østgaard, N, Stadsnes, J, Bjordal, J, Vondrak, RR, Cummer, SA, Chenette, DL, Parks, GK, Brittnacher, MJ, and McKenzie, DL. "Global-scale electron precipitation features seen in UV and X rays during substorms." Journal of Geophysical Research: Space Physics 104, no. A5 (1999): 10191-10204.
  - Cummer, SA, and Inan, US. "Measurement of charge transfer in sprite-producing lightning using ELF radio atmospherics (vol 24, pg 1731, 1997)." GEOPHYSICAL RESEARCH LETTERS 25, no. 6 (March 15, 1998): 901-901. Full Text Link to Item
  - Cummer, SA, Inan, US, Bell, TF, and Barrington-Leigh, CP. "ELF radiation produced by electrical currents in sprites." Geophysical Research Letters 25, no. 8 (1998): 1281-1284.
  - Cummer, SA, Inan, US, and Bell, TF. "Ionospheric D region remote sensing using VLF radio atmospherics." Radio Science 33, no. 6 (1998): 1781-1792.
  - Foster, JC, Cummer, S, and Inan, US. "Midlatitude particle and electric field effects at the onset of the November 1993 geomagnetic storm." Journal of Geophysical Research: Space Physics 103, no. A11 (1998): 26359-26366.
  - Cummer, SA, and Inan, US. "Measurement of charge transfer in sprite-producing lightning using ELF radio atmospherics." Geophysical Research Letters 24, no. 14 (1997): 1731-1734.
  - Cummer, SA. "VLF remote sensing of high-energy auroral particle precipitation." Journal of Geophysical Research A: Space Physics 102, no. A4 (1997): 7477-7484.
  - Cummer, SA. "An Analysis of New and Existing FDTD methods for isotropie cold plasma and a method for improving their accuracy." IEEE Transactions on Antennas and Propagation 45, no. 3 (1997): 392-400. Full Text
  - Kelley, MC, Baker, SD, Holzworth, RH, Argo, P, and Cummer, SA. "LF and MF observations of the lightning electromagnetic pulse at ionospheric altitudes." Geophysical Research Letters 24, no. 9 (1997): 1111-1114.
  - Cummer, SA, Bell, TF, Inan, US, and Zanetti, LJ. "VLF remote sensing of the auroral electrojet." JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 101, no. A3 (March 1, 1996): 5381-5389. Full Text Link to Item
  - Bell, TF, Inan, US, Danielson, MT, and Cummer, SA. "VLF signatures of ionospheric heating by HIPAS." Radio Science 30, no. 6 (1995): 1855-1867. Full Text
  - Cummer, SA. "Another new FDTD method for linear dispersive media - but this one's the best yet." IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) 1 (1995): 208-211.
  - Liu, N, Dwyer, JR, and Cummer, SA. "Elves Accompanying Terrestrial Gamma Ray Flashes (Published online)." Journal of Geophysical Research: Space Physics . Full Text
  - Popa, B-I, and Cummer, SA. "Derivation of effective parameters of magnetic metamaterials composed of passive resonant LC inclusions." Link to Item
  - Rahm, M, Cummer, SA, Schurig, D, Pendry, JB, and Smith, DR. "Optical design of reflectionless complex media by finite embedded coordinate transformations." Phys. Rev. Lett. 100: 063903-. Full Text Link to Item
  - Xie, Y, Popa, B-I, Zigoneanu, L, and Cummer, SA. "Measurements of Broadband Negative Index in Space-Coiling Acoustic Metamaterials." Full Text Link to Item
Teaching & Mentoring
Recent Courses
Scholarly, Clinical, & Service Activities
Presentations & Appearances
- Acoustic Metamaterials. Metamaterials 2015 - Plenary Lecture. September 7, 2015 - September 10, 2015 2015
- Cloaking Sound and Light. Department of Mechanical Engineering Seminar. University of Washington . May 12, 2015 2015
Service to Duke
- Pratt Appointment, Promotion, and Tenure Committee. 2015 2015
- Executive Committee of the Graduate Faculty. 2014 2014

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