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

M. Theuer | Zendy; S. Sree Harsha | Zendy; D. Grischkowsky | Zendy

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

Author(s) -

M. Theuer,

S. Sree Harsha,

D. Grischkowsky

Publication year - 2010

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.3516307

Subject(s) - terahertz radiation , materials science , spectroscopy , optics , terahertz spectroscopy and technology , collimated light , coupling (piping) , optoelectronics , waveguide , resolution (logic) , physics , quantum mechanics , artificial intelligence , computer science , metallurgy , laser

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

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