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

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18 Citations (Scopus)

Abstract

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
Pages (from-to)3502-3509
Number of pages8
JournalApplied Optics
Volume55
Issue number13
DOIs
Publication statusPublished - May 1 2016

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Matsumura, T., Young, K., Wen, Q., Hanany, S., Ishino, H., Inoue, Y., Hazumi, M., Koch, J., Suttman, O., & Schütz, V. (2016). Millimeter-wave broadband antireflection coatings using laser ablation of subwavelength structures. Applied Optics, 55(13), 3502-3509. https://doi.org/10.1364/AO.55.003502