![]() ![]() To approach this new emissive characteristic, based on PDMS film, we exploited the guided-mode resonance in the two-dimensional photonic crystal, which introduces a reflectance window between the two atmospheric windows. The proposed emitter has greater cooling potential than both selective and broadband emitters according to our calculations, expect for the extreme sub-ambient conditions. In this work, we put forward a new type of emitter which has high emissivity in the two atmospheric windows (8–13 μm & 16–25 μm) while maintaining high reflectance at other wavelengths. Blackbody-like broadband emitter and 8–13 μm selective emitter are the two major types of emitters used in current techniques. ![]() Due to the increasing power consumption for air-conditioning, the power-free passive radiative cooling technique has drawn great attentions in recent years. ![]()
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