Broadband tunable mid-infrared absorber based on conductive strip-like meta-atom elements

TL;DR

This paper presents a broadband mid-infrared absorber using metallic strip meta-atoms, achieving over 90% absorption, tunability, and polarization tolerance, based on detailed theoretical analysis and design optimization.

Contribution

It introduces a novel design of a tunable, broadband mid-infrared absorber using conductive strip meta-atoms with high absorption efficiency and polarization insensitivity.

Findings

Absorption cross-section exceeds geometrical area by 17 times.

Achieves over 90% absorption in 8.2-18 μm spectrum.

Exhibits polarization and incident angle tolerance.

Abstract

A metamaterial composed of thin metallic strips as an efficient broadband absorber in the mid-infrared spectrum is investigated. Here the matching between dielectric and geometrical properties of the individual elements is critical to ensure high absorption. Detailed theoretical analysis based on the electric dipole approximation is performed to characterize the absorption and scattering properties of the individual elements of the unit cell and the results are used to design the metamaterial composed of such configurations. The absorption cross-section of a strip-shaped element can exceed its longitudinal geometrical cross-section area by 17 times. It was shown that the absorptance of the Ni-based metal-insulator-metal (MIM) metamaterial structure can exceed 90 % in about 8.2 - 18 um spectrum. The broadband absorption is associated with the excitation of the low-Q-factor dipole modes of the strips. Such an absorber demonstrates good polarization and incident angle tolerance for transverse-electric (TE) waves. The absorption spectrum can be tuned by varying individual element parameters.