A wide-band perfect light absorber at mid-wave infrared using multiplexed metal structures

TL;DR

This paper demonstrates a wide-band near-perfect light absorber in the mid-wave infrared using multiplexed gold metal structures, achieving over 98% absorption across a broad spectral range.

Contribution

The study introduces a novel multiplexed plasmonic metal structure design that significantly broadens the absorption band compared to traditional non-multiplexed absorbers.

Findings

Multiplexed structures absorb over 98% of incident IR light.

The multiplexed design achieves a wider spectral absorption band.

Experimental validation confirms the effectiveness of the design.

Abstract

We experimentally demonstrate a wide band near perfect light absorber in the mid-wave infrared region using multiplexed plasmonic metal structures. The wide band near perfect light absorber is made of two different size gold metal squares multiplexed on a thin dielectric spacing layer on the top of a thick metal layer in each unit cell. We also fabricate regular non-multiplexed structure perfect light absorbers. The multiplexed structure IR absorber absorbs above 98% incident light over a much wider spectral band than the regular non-multiplexed structure perfect light absorbers in the mid-wave IR region.