Infrared-Shielding of Plasmonic Random Metasurface Constructed by Cesium-Doped Tungsten Bronze

TL;DR

This paper theoretically investigates how randomness in nanoparticle arrangement and shape in a plasmonic metasurface affects its infrared heat-shielding properties, revealing that higher coverage and shape randomness improve reflection.

Contribution

It introduces a theoretical analysis of the impact of nanoparticle randomness on infrared shielding in plasmonic metasurfaces, highlighting the role of effective coverage and shape variability.

Findings

High coverage reduces near-infrared reflection by at least 20% with randomness.

Low coverage shows negligible effect of randomness on reflection.

Shape randomness enhances near-infrared reflection performance.

Abstract

The heat-shielding properties of random metasurface, composed of spherical or spheroidal nanoparticles with random displacements and/or random deformation, were theoretically investigated using the finite difference time domain method. The effective coverage was defined using the total area of nanoparticles in the metasurface, and the robustness of the near-infrared light reflection against randomness was investigated. When the effective coverage was high, the near-infrared light reflection was reduced by at least 20% in both nanoparticle arrangement and shape randomness compared to the hexagonal close-packed perfect metasurface. In contrast, when effective coverage was low, the randomness of the nanoparticle arrangement had almost no effect on the near-infrared light reflection. Furthermore, the near-infrared light reflection performance was improved by the randomness of the nanoparticle shape.