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Published May 1, 2021 | Published + Supplemental Material
Journal Article Open

AlSb as a material for high index contrast nanophotonics


High contrast materials, i.e., materials with a high refractive index and low optical loss, are of wide interest for nanophotonics and metasurface designs at optical and near infrared wavelengths. We explore aluminum antimonide (AlSb) as a high contrast nanophotonic material, using the design of high contrast gratings (HCGs) for low loss dielectric mirrors as an example. The high index of refraction and low absorption coefficient of AlSb in the visible wavelength range enable designs of HCGs that can be effectively optimized to form mirrors with 93.5% reflectivity at red visible wavelengths. We detail a co-sputtering synthesis method for AlSb films, and achieve our target high index of refraction of 3.5 for 635 nm light. We also find that the high sensitivity of AlSb oxidation requires specific handling procedures in developing deposition processes to yield a near zero absorption coefficient.

Additional Information

© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Received 8 Feb 2021; revised 13 Mar 2021; accepted 15 Mar 2021; published 2 Apr 2021. This work was supported by the Space Solar Power project and the U.S. Department of Energy, Advanced Research Projects Agency for Energy under Grant DE-AR0000627. Fabrication and analysis support and infrastructure was provided by the Kavli Nanoscience Institute at Caltech. Funding: Space Solar Power Project; Advanced Research Projects Agency - Energy (DE-AR0000627). The authors declare that there are no conflicts of interest related to this article.

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Published - ome-11-5-1334.pdf

Supplemental Material - 5141467.pdf


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August 20, 2023
October 23, 2023