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Strong Broadband Terahertz Optical Activity through Control of the Blaschke Phase with Chiral Metasurfaces

Publication ,  Journal Article
Cole, MA; Chen, WC; Liu, M; Kruk, SS; Padilla, WJ; Shadrivov, IV; Powell, DA
Published in: Physical Review Applied
July 21, 2017

We demonstrate terahertz chiral metamaterials that achieve resonant transmission and strong optical activity. This response is realized in a metasurface coupled to its Babinet complement, with additional twist. Uniquely, the optical activity achieved in this type of metamaterial is weakly dispersive around the resonant transmission maxima, but it can be highly dispersive around the transmission minima. It has recently been shown that this unique optical activity response is closely related to zeros in the transmission spectra of circular polarizations through the Kramers-Kronig relations and strong resonant features in the optical activity spectrum corresponding to the Blaschke phase terms. Here we demonstrate how modifying the meta-atom geometry greatly affects the location and magnitude of these Blaschke phase terms. We study three different meta-atoms, which are variations on the simple cross structure. Their responses are measured using terahertz time-domain spectroscopy and analyzed via numerical simulations.

Duke Scholars

Published In

Physical Review Applied

DOI

EISSN

2331-7019

Publication Date

July 21, 2017

Volume

8

Issue

1

Related Subject Headings

  • 51 Physical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
 

Citation

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Cole, M. A., Chen, W. C., Liu, M., Kruk, S. S., Padilla, W. J., Shadrivov, I. V., & Powell, D. A. (2017). Strong Broadband Terahertz Optical Activity through Control of the Blaschke Phase with Chiral Metasurfaces. Physical Review Applied, 8(1). https://doi.org/10.1103/PhysRevApplied.8.014019
Cole, M. A., W. C. Chen, M. Liu, S. S. Kruk, W. J. Padilla, I. V. Shadrivov, and D. A. Powell. “Strong Broadband Terahertz Optical Activity through Control of the Blaschke Phase with Chiral Metasurfaces.” Physical Review Applied 8, no. 1 (July 21, 2017). https://doi.org/10.1103/PhysRevApplied.8.014019.
Cole MA, Chen WC, Liu M, Kruk SS, Padilla WJ, Shadrivov IV, et al. Strong Broadband Terahertz Optical Activity through Control of the Blaschke Phase with Chiral Metasurfaces. Physical Review Applied. 2017 Jul 21;8(1).
Cole, M. A., et al. “Strong Broadband Terahertz Optical Activity through Control of the Blaschke Phase with Chiral Metasurfaces.” Physical Review Applied, vol. 8, no. 1, July 2017. Scopus, doi:10.1103/PhysRevApplied.8.014019.
Cole MA, Chen WC, Liu M, Kruk SS, Padilla WJ, Shadrivov IV, Powell DA. Strong Broadband Terahertz Optical Activity through Control of the Blaschke Phase with Chiral Metasurfaces. Physical Review Applied. 2017 Jul 21;8(1).

Published In

Physical Review Applied

DOI

EISSN

2331-7019

Publication Date

July 21, 2017

Volume

8

Issue

1

Related Subject Headings

  • 51 Physical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences