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Updated: Jul 3, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Angle-driven topological phase transition in 2D photonic crystals: a cavity-waveguide coupled system for EIT-like
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In this paper, we design two nontrivial unit cells with phase transition driven by the rotation angle. By analyzing the evolution of the energy bands and calculating the topological indices, we discover that they have different topological properties. Subsequently, using topologically distinct unit cells, we realize a topological edge state (TES) waveguide, a topological corner state (TCS), and artificially introduce a trivial cavity (TC). Interestingly, we find that the coupling of TCS, TC, and the TES waveguide can be designed as a cavity-waveguide coupled system (CWCS) to generate an electromagnetically induced transparency analogue (EIT-like) effect. Theoretical calculation and numerical simulation show good consistency. Furthermore, we verify the strong robustness of the EIT-like effect against structural defects, and the CWCS applied to refractive index sensing exhibits good sensitivity. This work is expected to lay a foundation for further developments in exploring and applying topological photonics.
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