Whispering-gallery-mode terahertz pulse propagation on a curved metallic plate
نویسندگان
چکیده
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. © 2010 American Institute of Physics. doi:10.1063/1.3466909
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