摘要
We present an ultrathin and flexible Janus radiative cooler designed to enhance passive heat dissipation in energy-efficient systems. The Janus radiative cooler is composed of a top selective emitter and a bottom broadband emitter, enabling directional thermal radiation within the 8- 13 μm atmospheric window. Simulation results indicate that the excitation of spoof surface plasmon polaritons (sSPPs) facilitates enhanced mid-infrared emissivity, yielding an average emissivity exceeding 80 percent within the atmospheric transparency window. To evaluate system-level cooling performance, we constructed a thermal sensing platform in which the Janus radiative cooler serves as the top cover under continuous internal heating conditions. Finite element analysis reveals that this configuration facilitates directional heat transport: the top layer radiates excess thermal energy into outer space, while the bottom layer absorbs mid- to far-infrared heat from the enclosed space. Overall, the proposed ultrathin and flexible Janus radiative cooler demonstrates strong potential for passive thermal management.