The Japan Society of Applied Physics

2023 International Conference on Solid State Devices and Materials

2023 International Conference on Solid State Devices and Materials

Sep 5, 2023 - Oct 31, 2023
Nagoya Congress Center

10:00 AM - 10:15 AM

[H-3-04] Rate Equation Analysis for Deterministic and Unidirectional Lasing in Ring Resonators with an S-shaped Coupler

○Zhiwei Dai1, Wenbo Lin2, Satoshi Iwamoto1,3 (1. RCAST, Univ. of Tokyo (Japan), 2. KIS, Univ. of Tokyo (Japan), 3. IIS, Univ. of Tokyo (Japan))

https://doi.org/10.7567/SSDM.2023.H-3-04

A ring resonator that achieves unidirectional lasing becomes important in the on-chip generation of novel optical beams like optical vortexes and in exploring non-Hermitian photonics. We numerically analyzed the lasing characteristics in a ring resonator equipped with an S-shaped coupler using the rate equation model. Our results show that cross-gain saturation is key to highly unidirectional and backscattering-robust lasing, while unsymmetrical coupling due to the S-shaped coupler guarantees deterministic lasing in the desired direction.