Abstract: The present invention relates to a method for preparing a metamaterial in the form of a film having high visible light transmittance and excellent radiative cooling characteristics even with a small thickness by powder coating. In the present invention, a metamaterial in the form of a highly transparent film can be prepared by powder coating of aerogel particles, an optical modulator, and a base resin. The metamaterial formed according to the present invention can exhibit excellent visible light transmittance and heat dissipation characteristics and, since a powder coating process is used, a metamaterial coating can be formed regardless of the shape of an object and the coating can be thin and uniform.

Abstract: The present invention relates to a metamaterial composition having excellent radiative cooling characteristics and a film prepared from same. The metamaterial of the present invention comprises a base material, aerogel particles and optical control agent, and thus can exhibit high visible light transmittance and excellent infrared emissivity even with a thin thickness. Therefore, the metamaterial of the present invention can be used as a radiative cooling film requiring transparency, and can be usefully applied to, especially, a cover window for a display.