On the basis that metal films possess the properties of high reflection for infrared and induced transmission for visible bands, the authors have designed a broadband dichroic filter capable of transmitting visible and reflecting infrared bands through stacking to form a combined dielectric-metal-dielectric thin-film system. Experimental results show its transmittance in the visible region is 80–88%, while its reflectance in the intermediate and far-infrared regions is 90%.
© 1985 Optical Society of Amiierica
Qiongrui Li and Hengyi Li, "Design of a broadband dichroic filter for transmitting visible and reflecting infrared bands," Appl. Opt. 24, 1180-1182 (1985)