Multispectral compatible camouflage with thermal management based on a multilayer thin film structure

A multispectral-compatible camouflage device with effective thermal management is proposed, which consists of seven thin films with five materials (Si, Ge, SiO₂, GST and Al). Within the visible spectrum (380-780 nm), the structural color of the device can be controlled by altering the thickness of the top Si layer, allowing it to adapt to diverse environmental backgrounds. Within the infrared spectrum, the average emissivity in the atmospheric window of 3-5 μm and 8-14 μm is as low as 17.7% and 23.0% respectively. However, it is as high as 65.7% in the non-atmospheric window 5-8 μm, which can realize effective thermal management with a net radiative cooling power of 500 W/m² at an ambient temperature of 300 K and a working temperature of 350 K. For laser radar camouflage, it has a narrowband high emissivity of 81.3%, 84.8% and 81.4% at 1.06 μm, 1.55 μm and 10.6 μm respectively. Additionally, the device has excellent angular and polarization insensitivity. Using a simple film structure to realize multispectral camouflage and efficient thermal management guides coordinated control of electromagnetic waves and heat, which has wide implications in industrial manufacturing and military camouflage fields.