Abstract

The coupled cavity-waveguide approach provides a flexible platform to design integrated photonic devices that are widely applied in optical communications and information processing. Topological photonic crystals that can excite the nontrivial edge state (ES) and corner state (CS) have an unprecedented capability to manipulate electromagnetic (EM) waves, leading to a variety of unusual functionalities that are impossible to achieve with conventional cavity-waveguide systems. In this Letter, two-dimensional photonic crystals consisting of an ES waveguide, a CS cavity, and a trivial cavity are proposed as a means to robustly control the transmission characteristics of electromagnetic waves. As a proof-of-principle example, the analog of electromagnetically induced transparency (EIT) that is tolerated in disorders due to the robustness of the CS is numerically demonstrated. In addition, the analog of multi-EIT is also verified by introducing a trivial cavity with two degenerate orthogonal modes. This unique approach for robustly manipulating EM waves may open an avenue to the design of high-performance filters, modulators, and on-chip processors.

© 2022 Optica Publishing Group

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)

Manipulating the optical beam width in topological pseudospin-dependent waveguides using all-dielectric photonic crystals

Zhong Hu, Meibao Qin, He Lingjuan, Wenxing Liu, Tianbao Yu, Shuyuan Xiao, and Qinghua Liao
Opt. Lett. 47(20) 5377-5380 (2022)

Collective topological corner modes in all-dielectric photonic crystal supercell arrays

Zhaojian Zhang, Junbo Yang, Te Du, Hansi Ma, and Xinpeng Jiang
Opt. Lett. 47(7) 1642-1645 (2022)

Topological edge solitons in χ⁽²⁾ waveguide arrays

Yaroslav V. Kartashov
Opt. Lett. 47(22) 5945-5948 (2022)

Topological edge states of a long-range surface plasmon polariton at the telecommunication wavelength

Ran Gladstein Gladstone, Sukrith Dev, Jeffery Allen, Monica Allen, and Gennady Shvets
Opt. Lett. 47(17) 4532-4535 (2022)