Manipulation of Topological Edge States and Realization of Zero-Dimensional Higher-Order Topological Point States

Topological photonics has provided revolutionary ideas for the design of next-generation photonic devices due to its unique light transmission properties. This paper proposes a honeycomb photonic crystal structure based on a mirror-symmetric interface and numerically simulates the precise manipulati...

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Published inMicromachines (Basel) Vol. 16; no. 6; p. 686
Main Authors Ren, Jiahui, Ding, Wenjing, Wang, Sihan, Tang, Shiwei
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 07.06.2025
MDPI
Subjects
Crystal defects
Crystal structure
Crystals
Energy bands
higher-order topological state
Interfaces
Light transmission
Phase transitions
Photonic crystals
Photonics
Stitching
Structure
Symmetry
topological edge state
topological photonics
Topology
topological photonics
topological edge state
higher-order topological state
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Summary:Topological photonics has provided revolutionary ideas for the design of next-generation photonic devices due to its unique light transmission properties. This paper proposes a honeycomb photonic crystal structure based on a mirror-symmetric interface and numerically simulates the precise manipulation of topological edge states and the robust excitation of high-order topological corner states in this structure. Specifically, two honeycomb photonic crystals with non-trivial topological properties form an interface through mirror-symmetric stitching. Continuous adjustment of the spacing between their coupling pillars can induce the closure and reopening of topological edge state energy bands, accompanied by significant band inversion, revealing the dynamic process of topological phase transitions. Furthermore, zero-dimensional high-order topological corner states are observed at the junction of boundaries with different topological properties. Their localized field strengths are strictly confined and exhibit strong robustness against structural defects. This study not only provides a new mechanism for the local symmetry manipulation of topological edge states but also lays a foundation for the design of high-order topological photonic crystals and the practical application of topological photonic devices.
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These authors contributed equally to this work.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi16060686