Abstract
We propose a flat multilayered structure fabricated from gradient epsilon-near-zero (ENZ) materials (SiO2/Si3N4/Al2O3/AlN/TiO2/α-Ta2O5) coated on aluminium (Al) that enables broadband directional control of infrared absorption and adopt the Particle Swarm Optimization (PSO) method to optimize its structural parameters. The results demonstrate that the absorbers can exhibit high absorption (> 0.6) at specific angles (60° to 80°) and near-unity omnidirectional (0° to 80°) absorption both in p-polarization with covering the entire long-wavelength infrared (LWIR) range (8 μm to 14 μm), respectively. The directional control of the absorption with high efficiency and wide bandwidth would be great potential in applications such as thermal imaging, infrared camouflaging, and radiative cooling.
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