Improvement of THz coupling using a tapered parallel-plate waveguide

This paper reports an experimental and simulation study of a tapered parallel-plate waveguide (TPPWG) to improve THz coupling to the plate separation gap. The flat- and round-type TPPWG without any silicon lens is compared to the parallel-plate waveguide (PPWG) with a plano-cylindrical silicon lens....

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Bibliographic Details
Published inOptics express Vol. 18; no. 2; pp. 1289 - 1295
Main Authors Kim, Sang-Hoon, Lee, Eui Su, Ji, Young Bin, Jeon, Tae-In
Format Journal Article
LanguageEnglish
Published United States 18.01.2010
Subjects
Computer Simulation
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Models, Theoretical
Optical Devices
Refractometry - instrumentation
Reproducibility of Results
Sensitivity and Specificity
Terahertz Radiation
Transducers
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Summary:This paper reports an experimental and simulation study of a tapered parallel-plate waveguide (TPPWG) to improve THz coupling to the plate separation gap. The flat- and round-type TPPWG without any silicon lens is compared to the parallel-plate waveguide (PPWG) with a plano-cylindrical silicon lens. The spectrum amplitudes of the input-side TPPWG and the input- and output-side TPPWG both having a 3 degrees slop angle increased about 56% and 103% at 1 THz when compared to that of the PPWG. Since the input- and output-side TPPWG had almost no impedance mismatch to the propagating THz wave, coupling to the waveguide could be improved twice compared with the PPWG.
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ISSN:1094-4087
1094-4087
DOI:10.1364/oe.18.001289