SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 22: Focus Session: Emerging Semiconductor Laser Concepts

HL 22.3: Invited Talk

Friday, October 1, 2021, 11:00–11:30, H4

Topological nanocavity lasers and topological high-power lasers — •Yasutomo Ota^1,2, Yasuhiko Arakawa², and Satoshi Iwamoto^2,3,4 — ¹Keio University — ²Nanoquine, The University of Tokyo — ³RCAST, The University of Tokyo — ⁴IIS, The University of Tokyo

Topological photonics offers ways to advance optical resonator design. In particular, resonators based on topological edge states emerging at the exteriors of bulk optical structures have been intensively studied because they behave robustly against certain disorders. Combinations of such topological cavities with gain materials also gather enormous interest as a straightforward route to topological lasers. In this contribution, we discuss our recent efforts on topological lasers based on 0D edge states supported in 1D photonic topological structures. We realized single-mode topological nanocavities by interfacing two topologically-distinct photonic crystal nanobeams. Combined with quantum dot gain, we demonstrated the first topological nanocavity laser. Furthermore, we theoretically extended the concept of the 0D topological cavity design to high-power lasers. We considered sizable arrays of coupled resonators that form topological optical bands. In a similar manner to the topological nanocavity, by interfacing two topologically-different cavity arrays, we designed topological interface modes broadly-distributed among the whole systems. Properly supplying gain to the system, we numerically uncovered the possibility of robust single mode lasing from the broad-area mode, paving the way to high-power and high-beam-quality topological lasers.