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



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.



Journal of Applied PhysicsAmerican Institute of Physics

Published: Dec 1, 2010

Keywords: metallic thin films; silicon; submillimetre wave couplers; terahertz wave spectra; time resolved spectra

DOI: 10.1063/1.3516307

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