Ge dots in Optical Microcavities--A Possible Direction for Silicon-based Light Emitting Devices

Abstract

Different silicon optical microcavities with Ge self-assembled quantum dots are fabricated and characterized. Room-temperature microphotoluminescence measurements show that strong resonant light emission from Ge dots in the cavities dominate the spectra and the photoluminescence intensity is significantly enhanced by the optical resonance in the cavity. Control of the wavelengths of resonant peaks is demonstrated by tuning the lattice constant of photonic crystal structures. A quality factor around 3000 of the resonant peak is achieved by microring resonators with Ge self-assembled dots.