Wide-angle perfect absorber/thermal emitter in the THz regime

TL;DR

This paper presents a design for a metallic nanostructure that acts as a near-perfect absorber and thermal emitter in the THz regime, maintaining high absorption at large angles and tunable across visible to near-infrared wavelengths.

Contribution

It introduces a scalable, high-performance nanostructure design for perfect absorption and thermal emission with stable spectral features at high temperatures.

Findings

Achieves 99.9% absorption peak in nanostructures

Maintains high absorption at large angles with minimal frequency shift

Can be tuned across visible and near-infrared regimes

Abstract

We show that a perfect absorber/thermal emitter exhibiting an absorption peak of 99.9% can be achieved in metallic nanostructures that can be easily fabricated. The very high absorption is maintained for large angles with a minimal shift in the center frequency and can be tuned throughout the visible and near-infrared regime by scaling the nanostructure dimensions. The stability of the spectral features at high temperatures is tested by simulations using a range of material parameters.