Journal
JOURNAL OF APPLIED PHYSICS
Volume 108, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3516307
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Funding
- Fraunhofer Gesellschaft FhG
- National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0757680] Funding Source: National Science Foundation
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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. (C) 2010 American Institute of Physics. [doi:10.1063/1.3516307]
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