Radiation refrigeration optical filter, method for preparing same and application of radiation refrigeration optical filter

Abstract

The invention discloses a radiation refrigeration optical filter which comprises a substrate. A single surface of the substrate is polished, a metal reflecting layer is arranged on a rough surface ofthe substrate, and an intermediate layer and a top layer are sequentially arranged on the polished surface of the substrate; the intermediate layer comprises layers A and layers B which are alternately arranged; the thicknesses of each layer A and each layer B are 50-400 nm; the layers A are made of silicon dioxide or aluminum oxide, and the layers B are made of titanium dioxide or silicon nitrideor silicon carbide; alternatively, the layers A are made of titanium dioxide or aluminum oxide, and the layers B are made of silicon dioxide or silicon nitride or silicon carbide; the top layer is made of ytterbium fluoride or yttrium fluoride or zinc sulfide; multi-resonant absorption enhancers in wavebands of atmospheric transparent windows (with the wavebands of 8-13 micrometers) are jointly formed by the intermediate layer and the top layer. Compared with the traditional optical filters, the radiation refrigeration optical filter has the advantages that the radiation refrigeration opticalfilter can work in intense light for a long time, and radiation refrigeration can be passively implemented by the radiation refrigeration optical filter.

Description

technical field

[0001] The invention relates to the field of environmental protection, energy-saving refrigeration and decoration, in particular to a radiation refrigeration filter and its preparation method and application. Background technique

[0002] Color filter is a common optical device that selectively reflects or transmits specific wavelengths in the visible light band to present different colors. and imaging and other fields have a wide range of applications.

[0003] Optical filters can be divided into reflective filters and transmissive filters. A reflective filter means that the filter can reflect light of a specific wavelength to display a specific color. When the incident light source is white light (such as sunlight), the reflective filter displays a specific color by reflecting light of a specific band, and the light of the remaining bands can be transmitted to the space on the back surface of the filter, which is a more common practice On the back of the ...

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