Work

Topological flatband of edge states for rainbow trapping in Z2 photonic crystals

Year: 2025

Type: article

Abstract: Topological photonics has provided a new perspective to manipulate the light and inspires the innovation of various nanophotonic devices. In this work, we propose a novel Z 2 topological PhC structure featuring an edge state flatband with extremely low group velocity across the entire Brillouin zone and protected by a large bandgap. By gradually varying the fusion degree of the dielectric cylinders in the unit cells along the topological waveguide, the flatband can be tailored to different frequency range at different locations of the waveguide, resulting in compact rainbow trapping of the topological interface states. This work provides a novel insight to the functional development of on-chip topological devices for optical buffering and frequency routing.

Source: Optics & Laser Technology

DOI: 10.1016/j.optlastec.2025.113336

Authors: Yutao Zhang, Zihang Cui, Wei Guo, Jin Tao, Guozhen Liang, Yongquan Zeng

Institutions: Wuhan University, Wuhan Institute of Quantum Technology, Peng Cheng Laboratory

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,230

Funders: National Natural Science Foundation of China, State Key Laboratory of Optical Communication Technologies and Networks, Wuhan Research Institute of Posts and Telecommunications, Fundamental Research Funds for the Central Universities, Shenzhen Science and Technology Innovation Program