Whispering-gallery-mode terahertz pulse propagation on a curved metallic plate

Mendis, Rajind; Mittleman, Daniel M.
July 2010
Applied Physics Letters;7/19/2010, Vol. 97 Issue 3, p031106
Academic Journal
We demonstrate terahertz (THz) pulse propagation on a cylindrical aluminum plate, with low loss and negligible dispersion via transverse-electric type whispering gallery (WG) modes. We observe an apparent superluminal effect where the group velocity is greater than c, and explain this phenomenon by means of a plane-wave description of the WG modes. The propagation loss is dominated by the diffraction loss due to unbounded lateral spreading, with a negligible ohmic-loss contribution. Both experimental and theoretical results indicate a total loss as low as 2.6 dB/m at a frequency of 0.47 THz.


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