Angular selective broadband radiative cooling based on Berreman mode

Conventional radiative coolers (RCs) exhibit excellent cooling performance in horizontally-installed scenarios but are mainly limited to roofing materials due to their emitting direction. To increase the availability of RC application on the area of a building facade, this article proposes an oblique radiation-angled photonic structure (ORAPS). ORAPS can facilitate thermal emission toward the outer space, evade the adjacent building, and reflect incoming radiative heat in a direction perpendicular to the panel. Along with the theoretical basis of designing the structure, we present simulation-based cooling performance analyses for diverse environmental parameters. This demonstrates that an ORAPS is useful not only for densely packed megacities but also for thermoregulation during the winter season.