Topological invariant plays a more and more important role in modern physics with the discovery of new materials such as topological insulators. The concept of momentum space topology has also been extended to various photonic systems to realize interesting applications. In this work, a plasmonic interface state is introduced between a photonic crystal and a metasurface which is protected by the Z2 topological mirror symmetry of the photonic crystals. Here we propose a scheme to experimentally measure the topological phase in a photonic system. Using reflection spectrum measurement, we determined the existence of interface states in the gaps, and then obtained the Zak phases. The interface state is excited when the reflection phase matching condition is satisfied. The reflection phase of metasurface can be tuned by changing the structural parameter. The resonance properties of interface state can be manipulated in the process. By manipulating the anisotropic property of the metasurface, we can further tune the polarization of the interface state. Field enhancement induced by the interface state will have important applications in nonlinear and quantum optics.
Qiang Wang, Meng Xiao, Hui Liu, Shining Zhu, and Cheting Chan, "Topological interface states between a photonic crystal and a metasurface
(Conference Presentation)," Proc. SPIE 9921, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIV, 99211N (Presented at SPIE Nanoscience + Engineering: September 01, 2016; Published: 9 November 2016); https://doi.org/10.1117/12.2236284.5161456664001.
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