Light absorber, bolometer, infrared absorber, solar thermal power generator, radiation cooling film, and method of manufacturing light absorber

摘要

In order to realize a light absorber capable of adjusting a wavelength range to be absorbed, in one embodiment of the present invention, a light absorber 100 comprising a group of dielectric convex portions 102, a conductive thin film 104, and a conductive thick film 108. Is provided. In the group of dielectric convex portions, each dielectric convex portion protrudes at random positions along the dielectric surface. The conductive thin film is disposed on or above at least a portion of the surface of each dielectric protrusion and on or over at least a portion of the dielectric surface where the dielectric protrusion is not present. The conductive thick film separates from the conductive thin film and spreads along the dielectric surface. The group of dielectric convex portions can also be realized by arranging dielectric particles at random positions in the plane. Furthermore, a bolometer using the light absorber, an infrared absorber, a solar thermal power generator, a radiation cooling film, and a method for producing the light absorber are also provided.