High quality planar silicon nitride microdisk resonators for integrated photonics in the visible wavelength range

Abstract
High quality factor (Q≈3.4×106) microdisk resonators are demonstrated in a Si3N4 on SiO2 platform at 652–660 nm with integrated in-plane coupling waveguides. Critical coupling to several radial modes is demonstrated using a rib-like structure with a thin Si3N4 layer at the air-substrate interface to improve the coupling.