Fabrication and characterization of Er-doped Silicon-Rich Oxide toroidal microcavities on chip

The fabrication process of Ultrahigh-Q toroidal microcavities and integration of erbium-doped silicon-rich oxide thin film inside these structures are reported. Using micro-photoluminescence setup, we achieve selective detection of whispering gallery modes at room temperature. Quality factors as high as 3200 are measured, limited by the setup resolution.