Mode Selection Method in Spherical Optical Cavities with Thin Metal Film

A new method for the selection of radial modes a spherical microresonator by quality factor, based on effect absorption in thin metal film deposited sphere together with dielectric layer, is proposed. The was proved numerical simulation example second and third TEl,l,q, l = 455, q 2, 3 80 μm radius quartz microsphere 5 nm thick nickel film. structure metal-dielectric coating determined using analytical formulas such way that placed at node selected mode E-field distribution. finite element used to refine calculation, optimizing position terms obtaining maximum factor. As result, it shown could have relatively high factor (Q~107), while other are significantly suppressed (Q~103). In addition, carried out index number (l) simultaneously index.