Broadband Absorbers and Selective Emitters based on Plasmonic Brewster Metasurfaces

TL;DR

This paper presents a novel design for broadband, omnidirectional absorbers and angularly selective thermal emitters using plasmonic Brewster metasurfaces, leveraging nonresonant effects for wide frequency range performance.

Contribution

It introduces a nonresonant approach combining plasmonic Brewster funneling and adiabatic focusing to achieve broadband absorption and emission, surpassing resonant limitations.

Findings

Demonstrates broadband absorption and emission across terahertz, infrared, and optical frequencies.

Achieves compact and efficient energy and defense applications.

Utilizes nonresonant effects for improved bandwidth performance.

Abstract

We discuss the possibility of realizing utlrabroadband omnidirectional absorbers and angularly selective coherent thermal emitters based on properly patterned plasmonic metastructures. Instead of relying on resonant concentration effects that inherently limit the bandwidth, we base our design on the combination of two inherently nonresonant effects: plasmonic Brewster funneling and adiabatic plasmonic focusing. With this approach, we demonstrate compact, broadband absorption and emission spanning terahertz, infrared and optical frequencies, ideal for various energy and defense applications.