Abstract

Second harmonic generation (SHG) in topological photonic crystals is chiefly concerned with frequency conversion between the same topological states. However, little attention has been paid to the effect of coupling between different topological states on the SHG. In this study, we propose a method for achieving optimal SHG in a topological cavity by matching the phase distributions of the electric fields of the topological corner state (TCS) and topological edge state (TES). Our results show that the intrinsic efficiency can be improved when the phase distributions of the fundamental wave within the TCS and the second harmonic wave within the TES have the same symmetry. Otherwise, conversion efficiency will be greatly inhibited. With this method, we achieved an optimal intrinsic efficiency of 0.165%. Such a platform may enable the development of integrated nanoscale light sources and on-chip frequency converters.

© 2023 Optica Publishing Group

Multi-topological state via the Brillouin zone overlap for nonlinear frequency conversion

Weipeng Hu, Xiaoyu Dai, Chao Liu, Shuangchun Wen, and Yuanjiang Xiang
Opt. Lett. 48(21) 5567-5570 (2023)

Coupled cavity-waveguide based on topological corner state and edge state

Aoqian Shi, Bei Yan, Rui Ge, Jianlan Xie, Yuchen Peng, Hang Li, Wei E. I. Sha, and Jianjun Liu
Opt. Lett. 46(5) 1089-1092 (2021)

Second harmonic generation enhancement and directional emission from topological corner state based on the quantum spin Hall effect

Kai Guo, Jintao Wu, Fujia Chen, Keya Zhou, Shutian Liu, and Zhongyi Guo
Opt. Express 29(17) 26841-26850 (2021)

Terahertz topological photonic crystals with dual edge states for efficient routing

Hongyang Xing, Guizhen Xu, Dan Lu, Junxing Fan, Zhanqiang Xue, Zhen Gao, and Longqing Cong
Opt. Lett. 48(11) 2805-2808 (2023)

Efficient first-order quasi-phase-matched backward second-harmonic generation

Patrick Mutter, Kjell Martin Mølster, Andrius Zukauskas, Valdas Pasiskevicius, and Carlota Canalias
Opt. Lett. 48(6) 1534-1537 (2023)