High-temperature flexible metasurface with broadband microwave polarization rotation and low infrared emissivity

Abstract

Advanced electromagnetic functional materials are more and more inclined to integrated design, for instance the compatibility in different spectra as well as wide temperature ranges. Metasurface provides an effective solution for multi-spectrum compatible design owning to its extraordinary performance. In this work, we propose a high-temperature flexible metasurface framework, which can simultaneously realize microwave polarization rotation and low infrared emissivity. As verification, a high-temperature resistant multi-spectrum compatible flexible metasurface is fabricated and measured, which can availably work up to 300 °C. For microwaves, the metasurface achieves the orthogonal polarization rotation efficiency of more than 90% in 5.2–7.5 GHz. For infrared, the metallic filling ratio of 84.42% is constructed by designing the metasurface pattern, thus reducing the infrared emissivity to 0.22 in 3–14 µm. This work provides a flexible metasurface framework for implementing multi-spectrum compatibility at high temperatures, which can be easily attached to the surface of high-temperature components and extended to more functional integration.