Affiliation:
1. State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou 310027 China
2. Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University 18 Shilongshan Road Hangzhou 310024 China
3. Institute of Advanced Technology Westlake Institute for Advanced Study 18 Shilongshan Road Hangzhou 310024 China
Abstract
AbstractControlling directional thermal emission to match the ultra‐broadband atmospheric window is a long‐standing scientific challenge. Here, a strategy is introduced for achieving ultra‐broadband directional thermal emission matching the atmospheric window by combining Fabry–Perot resonances and the Brewster effect. The planar system, comprising a thin dielectric film (Ge) on a radiative substrate, exhibits high p‐polarized emissivity (> 0.9) at specific directions (76°–84°) covering the entire atmospheric window (3–5 and 8–14 µm) and high omnidirectional emission (> 0.7) in the non‐atmospheric window (5–8 µm) for simultaneous efficient radiative cooling. Moreover, it can integrate independent dual‐band (visible–IR) information encryption and the infrared information anti‐snooping function. The approach offers unique insights into controlling thermal emission using planar films, with broad implications in camouflage, thermal management, and encryption.
Funder
National Natural Science Foundation of China
Subject
Condensed Matter Physics,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials