Xinyang Sunny Optics Co., Ltd.

Wei Yang

Weihong Ding

Niangong Xiao

Yeqing Fang

Ce Chen

An optical filter that includes a substrate and a first set of films disposed on a first surface of the substrate, wherein the first set of films includes a high refractive index film layer, a low refractive index film layer, and a matching film layer. A material of the matching film layer includes a nitrogen-doped silicon germanium mixture having a chemical formula SiGeN, where 0≤x≤1, and 0<y≤0.1. In a wavelength range of 780 nm to 3000 nm, a refractive index of the high refractive index film layer is greater than a refractive index of the low refractive index film layer, and a refractive index of the matching film layer is not equal to a refractive index of its adjacent film layer.

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Henan, China

Wei Yang