(under subclass 580) Subject matter wherein a layer of insulator or spacer is placed between optical layers, the changes in thickness of this layer control the location of the transmission bands in the spectrum.
(1) Note. A layer of dielectric material placed alternatively between reflective or transmissive layers is classified in this subclass.
(2) Note. The location of the transmissive band is dependent on the distance between the reflectors. As the distance is made larger, the transmission bands move toward the higher end of the spectrum, also the width of the transmission bands and the distance between adjacent transmission bands decrease.
