Abstract
We propose a width-tunable topological pseudospin-dependent waveguide (TPDW) which can manipulate the optical beam width using a heterostructure of all-dielectric photonic crystals (PhCs). The heterostructure can be realized by introducing a PhC featuring double Dirac cones into the other two PhCs with different topological indices. The topological pseudospin-dependent waveguide states (TPDWSs) achieved from the TPDW exhibit unidirectional transport and immunity against defects. As a potential application of our work, using these characteristics of TPDWSs, we further design a topological pseudospin-dependent beam expander which can expand a narrow beam into a wider one at the communication wavelength of 1.55 µm and is robust against three kinds of defects. The proposed TPDW with widely adjustable width can better dock with other devices to achieve stable and efficient transmission of light. Meanwhile, all-dielectric PhCs have negligible losses at optical wavelengths, which provides the prospect of broad application in photonic integrated devices.
© 2022 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Xinyue Yu, Jianfeng Chen, Zhi-Yuan Li, and Wenyao Liang
Photon. Res. 11(6) 1105-1112 (2023)
Yuting Yang, Xinyue Qian, Liwei Shi, Xiaopeng Shen, Yifan Wang, and Zhi Hong Hang
Opt. Express 30(4) 5731-5738 (2022)
Yulin Zhao, Feng Liang, Jianfei Han, Xiangru Wang, Deshuang Zhao, and Bing-Zhong Wang
Opt. Express 30(22) 40515-40530 (2022)