Thermal infrared and broadband microwave stealth glass windows based on multi-band optimization

With the rapid development of detection technologies, compatible stealth in the infrared and radar ranges has become increasingly essential not only for military application but also for personal privacy protection. In this study, we design a metamaterial window that possesses stealth ability in both the thermal infrared and broadband microwave ranges, using a particle swarm optimization algorithm to realize multi-band optimization. We experimentally verify that the proposed structure can achieve over 90% microwave absorption in the range 5.1 to 19.2 GHz (covering the X and Ku bands), with low infrared emissivity (similar to 0.15), and also maintain visible transmittance above 60%. Moreover, the window retains good performance up to 200 degrees C owing to the intrinsic properties of the material. Our multi-band optimization method enables the application of the transparent metamaterial windows in electromagnetic shielding and stealth and can potentially be applied in smart window related industries. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

In this study, a metamaterial window with stealth ability in the thermal infrared and broadband microwave ranges was designed using a particle swarm optimization algorithm for multi-band optimization. The proposed structure achieved over 90% microwave absorption, low infrared emissivity, and maintained visible transmittance above 60%. The window showed good performance up to 200 degrees C and has potential applications in electromagnetic shielding and smart window-related industries.