Journal
OPTICS EXPRESS
Volume 18, Issue 2, Pages 1289-1295Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.001289
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Funding
- Korean Government (MEST) [R11-2008-095-01000-0]
- MKE (The Ministry of Knowledge Economy), Korea [NIPA-2009-C1090-0903-0007]
- Ministry of Public Safety & Security (MPSS), Republic of Korea [C1090-1021-0015] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2008-0062257] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (C) 2010 Optical Society of America
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