Terahertz filter integrated with a subwavelength structured antireflection coating

Micro-pyramid shaped subwavelength structures (SWSs) were integrated on both sides of a terahertz (THz) filter by means of stamping methods. Two silicon-based stamping molds fabricated via crystallographic wet etching were utilized to replicate SWSs onto cyclo-olefin copolymer (COC) films coated ont...

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Bibliographic Details
Published inAIP advances Vol. 5; no. 12; pp. 127238 - 127238-7
Main Authors Woo, Jeong Min, Kim, Dae-Seon, Kim, Dong-Ju, Jang, Jae-Hyung
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.12.2015
AIP Publishing LLC
Subjects
Antireflection coatings
Broadband
Crystallography
Polyolefins
Signal transmission
Stamping
Standing wave ratios
Standing waves
Substrates
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Summary:Micro-pyramid shaped subwavelength structures (SWSs) were integrated on both sides of a terahertz (THz) filter by means of stamping methods. Two silicon-based stamping molds fabricated via crystallographic wet etching were utilized to replicate SWSs onto cyclo-olefin copolymer (COC) films coated onto both sides of a THz filter at the same time. The SWSs act as an broadband antireflection coating to reduce the surface reflection loss in a frequency range of 0.2 THz to 1.4 THz. Compared to a THz filter without SWSs, the filter integrated with double-sided SWSs exhibits a low standing wave ratio inside the substrate and THz signal transmission enhancement of up to 10.8%.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4939571