High-temperature stable polarization-multiplexed flexible absorber with low infrared emissivity based on graphene-assembled films

Due to the high-end integration, the new generation of advanced functional electronics will inevitably face challenges in thermal management. Metasurface, as a new unnatural periodic structure, can not only realize highly-effective electromagnetic wave (EM) manipulation owing to its extraordinary performance but also function in various complex environments by introducing advanced functional materials. In this work, we have proposed a polarization-multiplexed flexible metasurface absorber for microwave-infrared compatible stealth in high temperature conditions. To verify the characteristics of the proposed metasurface, the high-temperature polarization-multiplexed flexible absorber has been fabricated and measured, which is stable at temperatures up to 200 °C. For microwaves, the proposed metasurface is able to achieve individual perfect absorption at different frequencies for both x - and y -polarized incidence. For infrared, the introduction of thermal insulation materials, aerogel felt, and the patterned structure of graphene assembly film (GAF) with a large surface area filling ratio contribute to reducing the infrared emissivity to 0.40 in the range of 4-22 µm. This work proposes a polarization-multiplexed flexible absorber with excellent thermal stability and durable high-temperature stealth performance, showing great potential for thermal management applications in integrated electronic components operating under high-temperature environments.