Broadband Absorption Based on Thin Refractory Titanium Nitride Patterned Film Metasurface

Abstract

In this paper, a thin metasurface perfect absorber based on refractory titanium nitride (TiN) is proposed. The size parameter of the metasurface is investigated based on the finite difference time domain method and transfer matrix method. With only a 15-nm-thick TiN layer inside the silica/TiN/silica stacks standing on the TiN substrate, the near-perfect absorption throughout the visible regime is realized. The cross-talk between the upper and lower dielectric layers enables the broadening of the absorption peak. After patterning the thin film into a nanodisk array, the resonances from the nanodisk array emerge to broaden the high absorption bandwidth. As a result, the proposed metasurface achieves perfect absorption in the waveband from 400 to 2000 nm with an average absorption of 95% and polarization-insensitivity under the normal incidence. The proposed metasurface maintains average absorbance of 90% up to 50-degree oblique incidence for unpolarized light. Our work shows promising potential in the application of solar energy harvesting and other applications requiring refractory metasurfaces.

Numerical Study of Ultra-Broadband Metamaterial Perfect Absorber Based on Four-Corner Star Array

“…Benefiting the absorption mechanism of the broadband absorber proposed in this paper can be summarized as the result of localized surface plasmon resonance, strong plasma near-field coupling, Fabry–Perot resonance and the unique properties of high-loss materials [ 19 , 24 , 25 , 27 , 28 ]. In order to better explain the internal mechanism causing wide spectrum absorption, this paper further studies the electric field intensity distribution diagram and the magnetic field intensity distribution diagram corresponding to three absorption peaks, as shown in Figure 3 , in which (a)–(f) are the electric field diagrams in X–Y plane and the X–Z plane, and (g)–(l) are the magnetic field diagrams in X–Y plane and the X–Z plane.…”

MXene-Based Polarization-Insensitive UV-VIS-NIR Meta-Absorber

“…Shafique et al demonstrated VN/SiO2 based meta-absorber for solar thermophotovoltaic (STPV) system with 99% efficiency [28]. Similarly in another study TiN was explored by Hou et al for achieving >90% absorption in a waveband ranging from 400 to 2000 nm [29]. In another investigation, tungsten metal was explored for high absorption demonstration in the VOLUME XX, 2019 visible range by utilizing the polarization insensitive cylindrical geometry [30].…”

Perfect Optical Absorbers by All-Dielectric Photonic Crystal/Metal Heterostructures Due to Optical Tamm State

“…Optical absorbers have attracted considerable research attention for their potential to be used in applications, including solar energy [1,2], sensing [3,4], thermal radiation [5,6], imaging [7], and optical switching [8]. With the development of electromagnetic simulation and micro-nano processing technology, scientists have proposed a variety of perfect optical absorbers that can perfectly absorb light waves based on various micro/nano-structures, such as metamaterials [3,9,10], metasurface [11][12][13], and photonic crystals [14][15][16]. Micro/nano-structures that can excite the interface mode have also been used in the development of perfect optical absorbers in recent years.…”