Thin-film linear polarizers are glass substrates with specially designed and deposited optical coatings (polarizers). The thin film polarizer can either be parallel, working at a particular incidence angle, or a wedge of glass that is cemented to a second wedge to form a polarization cube with the optical coating cutting diagonally across the center.
Example: A 50-layer thin film polarizer designed by OptiLayer for the spectral range from 780 nm to 820 nm and the incidence angle of 45 degrees. Materials: Nb2O5 and SiO2; Thinnest layer is 64 nm.
You can design such a filter in several seconds.
You can reduce the number of layers step by step (for example, removing neighbor pairs of layer H and L) and make the refinement and obtain a structure with a smaller number of layers. With the of Digitize option you can control the ratio between Ts and Tp and achieve a balance between the required ratio as well as acceptable number of layers.