Abstract

Topological photonic crystal waveguides can create edge states that may be more robust against fabrication disorder and can yield propagation modes below the light line. We present a fully three-dimensional method to modify state-of-the-art designs to achieve a significant bandwidth improvement for lossless propagation. Starting from an initial design with a normalized bandwidth of 7.5% (13.4 THz), the modification gives more than 100% bandwidth improvement to 16.2% (28.0 THz). This new design is obtained using an automatic differentiation enabled inverse design and a guided mode expansion technique to efficiently calculate the band structure and edge state modes.

© 2021 Optical Society of America

Topological rainbow based on graded topological photonic crystals

Hongyu Zhang, Long Qian, Chenyang Wang, Chang-Yin Ji, Yaotian Liu, Jiali Chen, and Cuicui Lu
Opt. Lett. 46(6) 1237-1240 (2021)

Slow light waveguides in topological valley photonic crystals

Hironobu Yoshimi, Takuto Yamaguchi, Yasutomo Ota, Yasuhiko Arakawa, and Satoshi Iwamoto
Opt. Lett. 45(9) 2648-2651 (2020)

Dynamically reconfigurable topological states in photonic crystals with liquid crystals

Weipeng Hu, Jiali Hu, Shuangchun Wen, and Yuanjiang Xiang
Opt. Lett. 46(11) 2589-2592 (2021)

Topological photonic crystal fibers based on second-order corner modes

Ruirong Gong, Ming Zhang, Haibin Li, and Zhihao Lan
Opt. Lett. 46(16) 3849-3852 (2021)

Fragile topology in double-site honeycomb lattice photonic crystal

Yizhou Wei, Bei Yan, Yuchen Peng, Aoqian Shi, Deyun Zhao, Rui Peng, Yuanjiang Xiang, and Jianjun Liu
Opt. Lett. 46(16) 3941-3944 (2021)