Light pass filter and light sensing system having the same

Abstract

A light pass filter includes a base material and a multilayer film structure disposed on the base material. The multilayer film structure is formed by alternately stacking a plurality of silicon layers and a plurality of low refractive index layers along a longitudinal direction. The number of stacking pairs of the plurality of silicon layers and the plurality of low refractive index layers is at least five pairs. Accordingly, the light pass filter can effectively suppress visible light transmission under high-angle incidence conditions while significantly reducing the overall film stack thickness.

Images