Room-temperature optically pumped InAs/GaAs quantum dots microdisk lasers on SiO 2 /Si chip

We report on room temperature continuous-wave optically pumped InAs/GaAs quantum dot whispering gallery mode microdisk lasers, heterogeneously integrated on silica/silicon chips. The microdisks are fabricated by photolithography and inductively coupled plasma etching. The lasing wavelength is approximately 1200 nm and the obtained lowest laser threshold is approximately 28 μ W. The experimental results show an approach of possible integrated III–V optical active materials on silica/silicon chip for low threshold WGM microdisk lasers.