Near-Perfect Broadband Infrared Metamaterial Absorber Utilizing Nickel

TL;DR

This paper presents a compact, broadband, polarization and angle-insensitive metamaterial absorber using nickel, achieving over 80% absorption across a wide infrared range with high incidence angle tolerance.

Contribution

It introduces a novel nickel-based metamaterial design with a double square-like ring resonator for broadband infrared absorption, demonstrating high efficiency and angular stability.

Findings

Achieves ~81% relative bandwidth from 3.52 to 8.32 μm.

Maintains high absorption over a wide range of incident angles.

Uses effective medium theory to analyze the absorber's parameters.

Abstract

We propose a thin, compact, broadband, polarization and angle insensitive metamaterial absorber based on a tungsten reflector, silicon spacer and a top pattern composed of a double square-like ring resonator utilizing nickel(Ni). In such a structure, a high absorption (above 80 %) bandwidth ~ 4.8 {\mu}m from 3.52 up to 8.32 {\mu}m corresponding to the relative bandwidth ~81% can be achieved with deeply subwavelength unit cell dimensions. Here the physical origin of the broadband absorption is associated with low Q-factor dipole modes of the top pattern inner and outer sides functioning as rectangular nanoantennas. Owing to the structural symmetry, the absorber shows a good incidence angle tolerance in the relatively wide range for both TE and TM polarizations. The effective parameters of the Ni-based absorber were retrieved using the constitutive effective medium theory and the absorption characteristics of the effective medium and metamaterial were compared.