Journal
APPLIED OPTICS
Volume 55, Issue 13, Pages 3502-3509Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.55.003502
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Funding
- Japan Society for the Promotion of Science (JSPS) [15H05441, 24740182]
- Mitsubishi Foundation [24]
- ISAS Strategic Development Fund
- Grants-in-Aid for Scientific Research [15H05441, 15H05891, 24740182, 13J03626] Funding Source: KAKEN
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We report on the first use of laser ablation to make submillimeter, broadband, antireflection coatings (ARCs) based on subwavelength structures (SWSs) on alumina and sapphire. We used a 515 nm laser to produce pyramid-shaped structures with a pitch of about 320 mu m and a total height of near 800 mu m. Transmission measurements between 70 and 140 GHz are in agreement with simulations using electromagnetic propagation software. The simulations indicate that SWS-ARCs with the fabricated shape should have a fractional bandwidth response of Delta nu/nu(center) = 0.55 centered on 235 GHz for which reflections are below 3%. Extension of the bandwidth to both lower and higher frequencies, between a few tens of gigahertz and a few terahertz, should be straightforward with appropriate adjustment of laser ablation parameters. (C) 2016 Optical Society of America
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