High-Temperature Ultra-Broad UV-MIR High-Efficiency Absorber Based on Double Ring-Shaped Titanium Nitride Resonators

TL;DR

This paper proposes a high-temperature, ultra-broadband UV-MIR absorber using double-ring-shaped titanium nitride nanoresonators, achieving over 94.6% average absorption across 200-4000 nm, with potential applications in photovoltaics and thermal emitters.

Contribution

It introduces a novel TiN-based nanoresonator design with ultra-broadband, high-efficiency absorption that is polarization independent and suitable for high-temperature environments.

Findings

Achieves 94.6% average absorption from 200-4000 nm.

Demonstrates polarization independence and wide-angle acceptance.

Double TiN nano-rings with different heights improve absorption to over 95%.

Abstract

An ultrabroad absorber based on double-ring-shaped titanium nitride (TiN) nanoresonators, which can work in high temperatures, is proposed and numerically studied. The absorber with some optimal parameters exhibits an averaged absorption of 94.6% in the range of 200 - 4000 nm (from ultraviolet to mid-infrared) and a band from 200 - 3518 nm having an absorption > 90%. We have demonstrated in detail the physical mechanisms of the ultra-broad absorption, including the dielectric lossy property of TiN material itself in shorter wavelengths and plasmonic resonances caused by the metallic property of TiN nano-resonators in longer wavelengths. In addition, the absorber shows polarization independent and wide-angle acceptance. Another absorber with double TiN nano-rings of different heights has flatter and higher absorption efficiency (more than 95% absorption) at 200-2860 nm waveband. These properties make the proposed absorbers based on TiN has great potentials in many applications, such as light trapping, photovoltaics, thermal emitters.