Visualization of guided and leaky wave behaviors in an indium tin oxide metallic slab waveguide


Journal Article

© 2015 Optical Society of America. We explored the use of the optically transparent semiconductor indium tin oxide (ITO) as an alternative to optically opaque metals for the fabrication of photonic structures in terahertz (THz) near-field studies. Using the polaritonics platform, we confirmed the ability to clearly image both bound and leaky electric fields underneath an ITO layer. We observed good agreement between measured waveguide dispersion and analytical theory of an asymmetric metal-clad planar waveguide with TE and TM polarizations. Further characterization of the ITO revealed that even moderately conductive samples provided sufficiently high quality factors for studying guided and leaky wave behaviors in individual transparent THz resonant structures such as antennas or split ring resonators. However, without higher conductive ITO, the limited reflection efficiency and high radiation damping measured here both diminish the applicability of ITO for high-reflecting, arrayed, or long path-length elements.

Full Text

Cited Authors

  • Teo, SM; Werley, CA; Wang, C; Fan, K; Ofori-Okai, BK; Zhang, X; Averitt, RD; Nelson, KA

Published Date

  • June 1, 2015

Published In

Volume / Issue

  • 23 / 11

Start / End Page

  • 14876 - 14896

Electronic International Standard Serial Number (EISSN)

  • 1094-4087

Digital Object Identifier (DOI)

  • 10.1364/OE.23.014876

Citation Source

  • Scopus