Tunable selective metasurface emitter for laser and infrared compatible stealth with radiative cooling

Adjusting and controlling emissivity is a vital method for infrared camouflage and thermal radiation management. However, it remains challenging to achieve multispectral compatible stealth with radiation cooling. In this paper, a kind of grating-type selective metasurface emitter (GSME) for laser and infrared compatible stealth with radiative cooling is reported based on In 3 SbTe 2 (IST), which is composed of Ti/Ge/IST/Al₂O₃/Ti multilayer thin films. The ability to switch between the two phases of IST enables the utilization of the two states of GSME for emission management functions in various scenarios. For GSME in the crystalline phase, infrared stealth can be achieved, while for GSME in the amorphous phase, infrared stealth, laser stealth, and radiative heat dissipation can be simultaneously realized. Furthermore, the resonance mechanism of high emissivity is revealed by analyzing the electromagnetic field distribution, which is related to the modulation of the coupling between the Fabry-Pérot cavity resonance and the propagating surface plasmon resonance. Additionally, thermal imaging and temperature calculations indicate that the temperature difference between the object and background can reach 44.1°C, which further substantiates the effectiveness and adaptability of the infrared stealth performance. The proposed selective metasurface emitter provides new insights into multispectral compatible stealth, energy harvesting, and thermal management.