Direct nanoimprinting of moth-eye structures in chalcogenide glass for broadband antireflection in the mid-infrared

Publication: Research - peer-reviewJournal article – Annual report year: 2018

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Fresnel reflection at the boundary between two media of differing refractive indices is a major contributing factor to the overall loss in mid-infrared optical systems based on high-index materials such as chalcogenide glasses. In this paper, we present a study of broadband antireflective moth-eye structures directly nanoimprinted on the surfaces of arsenic triselenide (As2 Se3)-based optical windows. Using rigorous coupled-wave analysis, we identify a relief design optimized for high transmittance ( 12%) in the 5.9–7.3 μm spectral range as well as improved omnidirectional properties. Finally, we demonstrate the adaptability of nanoimprinted surface reliefs by tailoring the nanostructure pitch and height, achieving both extremely broadband antireflective and highly efficient antireflective surface reliefs. The results and methods presented herein provide an efficient and scalable solution for improving the transmission of bulk optics, waveguides, and photonic devices in the mid-infrared.
Original languageEnglish
JournalOptica
Volume5
Issue number5
Pages (from-to)557-563
ISSN2334-2536
DOIs
StatePublished - 2018
CitationsWeb of Science® Times Cited: 0
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