Asymmetric directional transmission-emission based on hyperbolic metastructure covering the short-wave near-infrared region
Tinghao Zhang, Bao-Fei Wan, Yu-Qi Zhao, Xingzhou Tang, Haifeng Zhang
Abstract
Stealth and camouflage technology in the infrared band has been a topic of wide interest in recent years. Wave propagation direction control is an important technology to achieve electromagnetic stealth. One-dimensional photonic crystals (1D PhC) composed of isotropic and anisotropic dielectric is an approach for achieving orientation selection. Asymmetric directional transmission-emission is an important component in energy issues and heat transfer. The hyperbolic metamaterial (HMM) plate can realize asymmetric performances by combining 1D PhC with an HMM plate to achieve asymmetric directional control. Among them, an HMM plate comprises metallic silver and an isotropic dielectric. 1D PhC consists of an isotropic dielectric and a layered structure with uniaxial properties. The resulting performance is effective within 270-390 terahertz, achieving a relative bandwidth of 36.3% and coverage of short-wave near-infrared. The asymmetry is reflected in the directional absorption-emission function for electromagnetic waves incident at positive angles and the directional transmission passage for electromagnetic waves incident at negative angles. It has an extremely broad application prospect in infrared stealth, radiative cooling, thermal camouflage, and so on.