Detailed Experiment-Theory Comparison of Mid-Infrared Metasurface Perfect Absorbers

Naoki To; Saulius Juodkazis; Yoshiaki Nishijima

doi:10.20944/preprints202003.0358.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 23 March 2020 / Approved: 27 March 2020 / Online: 27 March 2020 (12:32:57 CET)

The realization of a perfect absorber A = 1 with transmittance and reflectance T=R=0 by a thin metasurface is one of the hot topics in recent nanophotonics prompted by energy harvesting and sensor applications (A + R + T =1 is the energy conservation). Here we tested optical properties of over 400 structures of metal-insulator-metal (MIM) metasurfaces for a range of variation in thickness of insulator, the diameter of a disc and intra-disc distance experimentally and numerically. Conditions of a near-perfect absorption A > 95% with simultaneously occurring anti-reflection property (R < 5%) were experimentally determined. Differences between the bulk vs. nano-thin film properties at mid-IR of the used materials can be of interest for plasmonic multi-metal alloys and high entropy metals.

metasurface; mid infrared absorption; perfect absorption

PHYSICAL SCIENCES, Optics

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Detailed Experiment-Theory Comparison of Mid-Infrared Metasurface Perfect Absorbers

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