Patent ID: 11914179
Assignee: ZHEJIANG UNIVERSITY
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A radiative cooling optical filter, comprising a substrate, wherein
one side of the substrate is polished, a rough side of the substrate is provided with a metal reflective layer, a polished side of the substrate is subsequently provided with an intermediate layer and a top layer,
the intermediate layer comprises alternatingly arranged layers A and layers B, thickness of each layer A and layer B is 50-400 nm respectively,
a material of the layer A is silicon dioxide or aluminum oxide, and a material of the layer B is titanium dioxide, silicon nitride or silicon carbide,
or, the material of the layer A is titanium dioxide or aluminum oxide, and the material of the layer B is silicon dioxide, silicon nitride or silicon carbide,
a material of the top layer is ytterbium fluoride, yttrium fluoride or zinc sulfide,
the intermediate layer and the top layer jointly constitute a multi-resonant absorption enhancer in an atmospheric transparent window.