Mode characteristics of subwavelength aluminum/ silica-coated InAlGaAs/InP circular nanolasers

摘要

The mode characteristics are demonstrated for InAlGaAs/InP circular nanolasers bonded on silicon wafer, which consist of a core height of 800 nm coated by silica/aluminum on the bottom and sidewalls. The lasing mode spectra agree well with the simulated mode spectra obtained by the 3D FDTD technique for 750 and 450 nm radius nanolasers. For the 250 nm radius nanoresonator, resonant modes with Q factors 400-790 are numerically predicted with a mode wavelength interval up to 200 nm. The mode selection related to the cavity size and location of the active region is critical for nanocavity lasers to operate over a wide temperature range. In addition, the size limit is estimated for high-Q dielectric mode in the nanoresonators. Finally, electric-injection circular nanolasers are discussed with the TE0;1;1 mode.