Abstract

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 America

Far-infrared dichroic bandpass filters

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