A reflective narrow-band filter with multi-layer porous microstructure

Abstract

A reflective narrow-band optical filter with a multi-layer porous microstructure belongs to the field of optical technology. In order to overcome the problems of aging and falling off of the film layer of the optical filter and absorbing light energy in the prior art, the optical filter is directly placed on the surface of the optical glass. Scribing the formation of multiple groups of porous microstructures, which include: optical material substrate; the first group of high refractive index porous microstructures, which are directly connected to the optical material substrate; the second group of low refractive index porous microstructures, which are located On the first group of high-refractive-index porous microstructures; the third group of high-refractive-index porous microstructures is located on the second group of low-refractive-index porous microstructures; the surfaces of the three groups of porous microstructures are evenly distributed with micropores structure, the micropores are in the shape of a crock pot, and the cross-section is super-hemispherical, and the center points of adjacent micropores are connected in turn to form a hexagon; the centers of the three groups of porous microstructures are aligned up and down, and the first group of high refractive index holes The refractive index of the shape microstructure and the refractive index of the third group of high refractive index hole microstructures are greater than the refractive index of the second group of low refractive index hole microstructures.

Description

technical field [0001] The invention relates to a narrow-band optical filter, in particular to a narrow-band high-reflection multi-layer porous microstructure, which belongs to the field of optical technology. Background technique [0002] Interference filter is a multi-layer film system made by using the principle of multi-beam interference to filter out a small band from a wide spectrum, while allowing the rest of the short-wave and long-wave cut-off or reflection optical device. There are two commonly used interference filters, one is called all-dielectric interference filter: two sets of quarter-wavelength films are coated on flat glass, and the two sets of films can be regarded as two sets of high reflection films. There is a spacer layer in the middle; the other is a metal reflective film interference filter: a layer of high-reflectivity silver film is coated on the substrate, a dielectric film is coated on the silver film, and a layer of high-reflectivity silver film...

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a reflective narrow-band optical filter with a multi-layer porous microstructure in order to overcome the problems of aging and shedding of the optical filter film layer and absorbing light energy in the prior art.

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