Metasurfaces are increasingly investigated for applications of efficient photo-thermal energy conversion . Especially appealing is application for the sky radiator, a solution for cooling a room through optical windows exploiting high transparency of air at 8-13 m mid-IR spectral range. Typical metasurfaces for absorption control are made using a MIM layout of a Metal base plate, Insulator and Metal nanostructures. Thick (∼ 200 nm) metal base plate prevent the optical transmission at any wavelength. The concept of radiation cooling is that the thermal energy generated in the room can be emitted by a metasurface at the atmospheric IR transparency window. In these applications, metasurfaces are assumed to use a transparent (at visible) window or paint materials compatible with use in practical building/architecture solutions. Especially for the optical window applications, it is important to have properties of transparency at visible wavelengths while keeping a blocking (absorption and reflection) capability at the mid-infrared (MIR) spectral range.