Millimeter-wave broadband antireflection coatings using laser ablation of subwavelength structures

Tomotake Matsumura, Karl Young, Qi Wen, Shaul Hanany, Hirokazu Ishino, Yuki Inoue, Masashi Hazumi, Jürgen Koch, Oliver Suttman, Viktor Schütz

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


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 pyramidshaped structures with a pitch of about 320 μm and a total height of near 800 μm. 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 Δv/vcenter = 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.

Original languageEnglish (US)
Pages (from-to)3502-3509
Number of pages8
JournalApplied Optics
Issue number13
StatePublished - May 1 2016

Bibliographical note

Funding Information:
Japan Society for the Promotion of Science (JSPS) (15H05441, 24740182); Mitsubishi Foundation (24); ISAS Strategic Development Fund

Publisher Copyright:
© 2016 Optical Society of America.


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