Multiband laser stealth and long wave infrared stealth compatible metasurface based on Ge2Sb2Te5

Achieving the stealth of both guided-laser and infrared band is becoming increasingly crucial with the development of laser active detection and passive infrared imaging. It is particularly challenging due to the conflicting requirements of high absorption and low emission in the wavelengths near 10.6 μm. To address this contradiction, we propose a multiband laser stealth and long wave infrared stealth compatible metasurface based on phase change material Ge2Sb2Te5(GST). The metasurface has a multilayer stack structure, which will excite Mie resonance and localized plasmonic resonance in different spectral bands respectively. Simulations reveal that the metasurface demonstrates remarkable performance, owing to the phase change of GST. In the amorphous state, the metasurface has high absorptivity in the guided laser band (∼92%, ∼96.3% and ∼97.2% at 1.064 μm, 1.55 μm and 10.6 μm, respectively). In the crystalline state, the emissivity of the metasurface at 8-14 μm is low( 0.187). Additionally, this metasurface is polarization-insensitive and maintains a high absorptivity(∼87%, ∼91% and ∼87% at 1.064 μm, 1.55 μm and 10.6 μm, respectively) even at large incident angle(≥60°).