Journal article
Direct nanoimprinting of moth-eye structures in chalcogenide glass for broadband antireflection in the mid-infrared
Department of Micro- and Nanotechnology, Technical University of Denmark1
Polymer Micro & Nano Engineering, Department of Micro- and Nanotechnology, Technical University of Denmark2
Department of Photonics Engineering, Technical University of Denmark3
Fiber Sensors & Supercontinuum, Department of Photonics Engineering, Technical University of Denmark4
Surface Engineering, Department of Micro- and Nanotechnology, Technical University of Denmark5
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 (As2Se3)-based optical windows.
Using rigorous coupled-wave analysis, we identify a relief design optimized for high transmittance (<1% reflectance) at 6 μm, which when nanoimprinted features a transmittance improvement (ΔT > 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.
Language: | English |
---|---|
Year: | 2018 |
Pages: | 557-563 |
ISSN: | 23342536 |
Types: | Journal article |
DOI: | 10.1364/OPTICA.5.000557 |
ORCIDs: | Petersen, Christian Rosenberg , Taboryski, Rafael J. , Lotz, Mikkel Rønne , Markos, Christos , Bang, Ole and Jakobsen, Mogens Havsteen |