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.