Journal
SPIE LASER DAMAGE: LASER-INDUCED DAMAGE IN OPTICAL MATERIALS 2022
Volume 12300, Issue -, Pages -Publisher
SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2641631
Keywords
Metasurface; Antireflective coating; Substrate-engraved; Etching mask
Categories
Funding
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344, LLNL-PROC-841612]
- Lawrence Livermore National Laboratory (LLNL) Laboratory Directed Research and Development grant [18-ERD-005, 21-ERD-002]
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Recent studies have faced limitations in antireflective performance due to the restricted etching depth when utilizing metal etching masks to fabricate substrate-engraved metasurfaces. This article discusses advancements in etch mask technology to achieve deeper etching and taller metasurface features. The antireflective performance of these high aspect ratio structures with broad acceptance angles and broadband antireflective performance for both polarizations is also explored.
Recent work utilizing metal etching masks to fabricate substrate-engraved metasurfaces have been handicapped by the available etching depth, restricting the bandwidth of antireflective performance. Advances made to etch mask technology to facilitate deeper etching will be discussed here, and the taller ensuant metasurface features will be presented. The antireflective performance of these high aspect ratio structures (broad acceptance angles and broadband antireflective performance for both polarizations) will be discussed.
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