Wave length filter for e.g. optical mirror, has three cells consecutively juxtaposed on substrate, where one cell has two sections that are juxtaposed along propagation axis and differ by their refraction indexes and widths

摘要

The filter has three cells (C1-C3) consecutively juxtaposed on an optical substrate. One cell comprises of two sections (S1, S2) juxtaposed along a propagation axis of the filter. The two sections differ by their refraction indexes and widths. The section (S1) has a perturbation zone. The perturbation zone is primarily composed of same material as the rest of the section (S1).