Achieving efficient light trapping in the infrared using gold-black phosphorus nanostructured absorbers

Romil Audhkhasi; Michelle L. Povinelli

doi:10.1117/12.2568288

16 October 2020 Achieving efficient light trapping in the infrared using gold-black phosphorus nanostructured absorbers

Proceedings Volume 11503, Infrared Sensors, Devices, and Applications X; 115030W (2020) https://doi.org/10.1117/12.2568288
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Conference Poster

Abstract

We propose a gold -based nanostructured design for achieving enhanced absorption in ultrathin black phosphorus (BP) layers in the 3 – 5 micron wavelength range. We tune the design parameters to excite strongly localized radiation modes in layers of thicknesses ranging from 5 to 50 nm at 4 micron. In addition, we compute the absorption enhancement factor of these absorbers and compare it against the conventional 4n^2 limit. For a BP layer thickness of 5 nm, we are able to achieve an enhancement of around 150 which is significantly greater than the conventional value of 4n^2 equal to 64 for an isolated textured BP layer.

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Romil Audhkhasi and Michelle L. Povinelli "Achieving efficient light trapping in the infrared using gold-black phosphorus nanostructured absorbers", Proc. SPIE 11503, Infrared Sensors, Devices, and Applications X, 115030W (16 October 2020); https://doi.org/10.1117/12.2568288

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