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Coupling into tapered metal parallel plate waveguides using a focused terahertz beam

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3 Author(s)
Gerhard, M. ; Department of Electrical and Computer Engineering, University of Kaiserslautern, 67663 Kaiserslautern, Rhineland-Palatinate, Germany ; Theuer, M. ; Beigang, R.

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Coupling of focused terahertz radiation into tapered metal parallel plate waveguides with sub-wavelength gap widths is presented. A line-focus terahertz time-domain spectroscopy setup with flexible foci is used to investigate coupling of broadband terahertz radiation from free-space into waveguides for different gap widths. Various waveguide lengths are compared in experiment and calculation in terms of occurring loss and divergence phenomena. Amplitude coupling ratios of 80% from free-space into the waveguides are obtained.

Published in:

Applied Physics Letters  (Volume:101 ,  Issue: 4 )

Date of Publication:

Jul 2012

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