Authors
Ziyi Fu, Cai Luo, Zhixiang Yu, Nannan Hu, Yi Wang, Xizheng Ding, Enbo Gao, Baoli Liu, Geng Li, Xiaofeng Fan, Jianmei Li, Changzhi Gu, Yang Guo
Published in
Nano letters. Jul 06, 2026. Epub Jul 06, 2026.
Abstract
Topological photonics provides a route to disorder-robust optical states, among which the Jackiw-Rebbi (JR) state is a prototypical zero-mode bound to an interface. While realized in dielectric platforms, such states typically exhibit extended mode volumes limited by the photonic group velocity. Here we report the experimental observation of a plasmonic JR state in a 1D metal-dielectric grating. By varying a single geometric parameter, we induce a topological band inversion characterized by the change of Zak phases. At the interface between two different topological phases, we observe a sharp midgap state. Its lateral localization length is experimentally bounded above by <5 μm and simulated to be ∼0.7 μm. This enhanced confinement arises from the intrinsically flattened dispersion of plasmonic excitations, which reduces the group velocity and compresses the mode profile while preserving topological protection. Our work establishes a platform that combines topological robustness with compact field confinement.
PMID:
42407045
Bibliographic data and abstract were imported from PubMed on 07 Jul 2026.
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