Strong optical coupling between semiconductor microdisk lasers: From whispering gallery modes to collective modes

Abstract

In the present paper, we investigate a special type of optical coupling between two electrically pumped semiconductor whispering gallery mode lasers. We fabricate microdisk lasers with a conjunction between the laser cavities, making the coupling stronger. Our experimental results combined with numerical calculations demonstrate a variety of mode families that exist in such systems. Furthermore, we confirm the generation of resonance modes that exist only under simultaneous pumping conditions. These modes are attributed to the collective mode family, which can lead to a single mode operation.

Nanogap Enabled Trajectory Splitting and 3D Optical Coupling in Self-Assembled Microtubular Cavities

“…Optical microcavities guiding resonant light along a ring trajectory (i.e., the path of resonant light) in carefully designed geometries form whispering-gallery-mode (WGM) resonances by self-interferences and have been employed as a versatile photonic structure for many applications in lasing, nonlinear optics, and light–matter interactions. − To further explore the manipulation of resonant light, optically coupled WGM microcavities with hybridized resonant trajectories were explored to tune the resonant eigenfrequency and the spatial distribution of the resonant modes, indicating a variety of nontrivial physical phenomena and practical applications ranging from mode-selective lasing to non-Hermitian photonics. − In these coupling systems, the microcavity geometries ( i.e. , microtoroids, , microdisks, − microrings, − or microspheres , ) and the intercavity coupling gap play important roles to ensure sufficient spectral match and efficient coupling. In general, the optical coupling and energy transfer happen at a tangent site of two or multiple resonant trajectories located separately in the neighboring WGM microcavities. ,, It should be noted that the above-mentioned WGM microcavities support 2D confined resonant modes where the corresponding optical coupling is fixed at one 2D plane.…”