Inspired by the studies of topological materials, topological edge states—striking examples that support robust energy transport in photonic systems—have enriched condensed matter physics. Here we propose all-dielectric photonic crystals manipulating topologically protected defect modes at the edge of the configuration, which is distinct from previous platforms where helical edge states were excited at the interface between trivial and nontrivial crystals. The localization of frequency dispersion of one-way propagating defect modes is measured. Topological protection gives rise to the pseudospin-dependent transport and robustness against perturbations. Our proposal that enables one-way defect modes is promising for benefitting the microminiaturization and application of photonic topological structures.

中文翻译：

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全介电光子晶体中受拓扑保护的缺陷模式

受拓扑材料研究的启发，拓扑边缘状态（支持光子系统中可靠的能量传输的惊人示例）丰富了凝聚态物理。在这里，我们提出了全电介质光子晶体，该晶体在结构的边缘处操纵了拓扑保护的缺陷模式，这与以前的平台不同，之前的平台在平凡和非平凡的晶体之间的界面处激发了螺旋边缘态。测量了单向传播缺陷模式的频率色散局部。拓扑保护引起伪自旋相关的传输和抵抗干扰的鲁棒性。我们提出的使单向缺陷模式成为可能的提议，有望有益于光子拓扑结构的微小型化和应用。