Enhanced light trapping in the mid-infrared using gold-black phosphorus nanostructured absorbers

Romil Audhkhasi; Michelle L. Povinelli

doi:10.1117/12.2576932

5 March 2021 Enhanced light trapping in the mid-infrared using gold-black phosphorus nanostructured absorbers

Proceedings Volume 11688, 2D Photonic Materials and Devices IV; 116880Y (2021) https://doi.org/10.1117/12.2576932
Event: SPIE OPTO, 2021, Online Only

Conference Poster

Abstract

We propose a gold -based nanostructured design for achieving enhanced absorption in black phosphorus (BP) thin films in the 3 – 5 microns 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 microns. In addition, we compute the absorption enhancement factor of these absorbers and compare it against the conventional 4n2 limit. For a BP layer thickness of 5 nm, we are able to achieve an enhancement of around 561 at a wavelength of 4 microns which is significantly greater than the conventional value of 34 for an isolated textured layer.

Conference Presentation

Citation Download Citation

Romil Audhkhasi and Michelle L. Povinelli "Enhanced light trapping in the mid-infrared using gold-black phosphorus nanostructured absorbers", Proc. SPIE 11688, 2D Photonic Materials and Devices IV, 116880Y (5 March 2021); https://doi.org/10.1117/12.2576932

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