Flare coupled metal parallel-plate waveguides for high resolution terahertz time-domain spectroscopy

作者：Theuer Michael^*; Harsha S Sree; Grischkowsky D

来源：Journal of Applied Physics, 2010, 108(11): 113105.

DOI：10.1063/1.3516307

We report on a new coupling scheme for high resolution terahertz spectroscopy of microcrystalline films using parallel-plate waveguides. Metal flares are used to couple the terahertz radiation into and out of the waveguide. Very good coupling ratios as high as 35% at 1 THz from a collimated free-space beam into a subwavelength gap are obtained. This microwave approach is compared in terms of coupling ratio and spectral characteristics to the established technique of quasioptic coupling to parallel-plate waveguides using silicon lenses. Various samples at room and cryogenic temperatures are measured to show the capabilities of flare coupling for high resolution terahertz spectroscopy.

• 出版日期2010-12-1