OPTICAL FUNCTIONAL FILM FOR INFRARED LIGHT

摘要

To provide an optical functional film for infrared light, which has excellent durability and excellent optical function for serving as an optical member for infrared light. An optical functional film for infrared light having a multilayer structure, which comprises a plurality of optical function layers on a substrate. The optical functional film for infrared light is characterized in that: an adhesion enhancing layer, which has a film thickness smaller than any one of the plurality of optical function layers, is disposed in at least one space among the plurality of optical function layers; and the adhesion enhancing layer is a Y2O3 layer or an HfO2 layer. It is preferable that ZnS layers are contained as the optical functional layers.