Wavelength-Selective Thermal Regulators with Dual-Band Radiative Dissipation for Multispectral Camouflage

The widespread application of advanced multispectral detectors in surveillance and reconnaissance poses a serious threat to military equipment and personal safety. However, achieving comprehensive and effective camouflage across the visible (VIS) to infrared spectra and specific laser wavelengths, while maintaining efficient thermal management, remains a significant challenge. Herein, we propose a wavelength-selective thermal regulator (WSTR) that achieves excellent camouflage performance across a wide spectrum, including VIS, midwave infrared (MWIR, ε_3-5μm = 0.21), long-wave infrared (LWIR, ε_8-14μm = 0.17), and laser wavelengths (ε_1.06μm = 0.99, ε_1.55μm = 0.94, and ε_10.6μm = 0.91). The regulator emits a radiative intensity of 725.2 W/m² at high temperatures and 95.7 W/m² at relatively low temperatures. It achieves efficient thermal regulation through radiative heat dissipation via two nonatmospheric windows (ε_5-8μm = 0.60, ε_14-20μm = 0.63). Additionally, by varying the thickness of the ZnS film, a range of structural colors suitable for camouflage against different backgrounds can be achieved. Besides, this regulator employs a multilayer structural design that maintains stable spectral emissivity across a wide range of incident angles, thereby further enhancing the stability of its infrared camouflage performance. This study provides valuable insights and feasible solutions for the development of multispectral camouflage technology.