Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3430740
Keywords
terahertz spectroscopy; terahertz waves
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Funding
- Fraunhofer Gesellschaft FhG
- National Science Foundation
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We report on the adiabatic free-space coupling of broadband terahertz (THz) radiation through a subwavelength gap using metal flares. Amplitude coupling ratios better than 30% are obtained by optimizing the curvature. This scheme shows a large potential for increasing the sensitivity in THz spectroscopy using high spatial confinement without the need of transmission optics or high precision components. The intrinsic curvature of metal sheets is already sufficient to carry out experiments downsizing the microwave approach. (C) 2010 American Institute of Physics. [doi:10.1063/1.3430740]
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