Vertically coupled photonic molecule laser

摘要

A photonic molecule semiconductor microdisk laser consisting of three vertically coupled disks of 1.4 nm in diameter is fabricated and optically pumped. Clear mode splitting arising from the strong vertical optical coupling is observed and confirmed by the coupled mode theory. The inter-coupling strength～0.40THz of optical modes between adjacent disks is calculated and agrees well with the experiment. Moreover the multiple stacked microdisk laser has a large spontaneous emission factor (β～0.72) by fitting the L-L curves and provides some potential functional devices in cavity quantum electrodynamics systems and highly-dense photonic integrated circuits.