AI 中文总结
研究人员利用滑移对称谷光子晶体的正交谷与类SSH拓扑畴壁，实现了连续可调的高Q二维纳米腔，为紧凑型谐振器件及光与物质相互作用增强提供了方案。
AI 中文摘要
谷光子晶体可实现谷依赖的传输与手性选择发射，但要实现波长尺度的光限制仍存在挑战。现有谷光子晶体腔依赖有限缺陷或局部晶格修改，需针对特定结构优化，且连续调控能力有限。本文在理论与实验上，利用滑移对称谷光子晶体中的两条正交畴壁，实现了二维纳米腔限制：谷畴壁横向限制导行界面模式，类SSH畴壁纵向限制该模式。从胡须界面波导中滑移对称保护的狄拉克点出发，相邻三角形孔的可控位移会在连续导行模式色散中打开拓扑带隙，位移幅度ΔR可调控带隙、模式体积及固有辐射品质因数Q。该结构制备于硅光子晶体平板中，在拓扑模式带隙内呈现局域共振，并随ΔR表现出系统的光谱调谐，测得的最大负载Q因子为1.2×10⁴。该方法可实现连续可调、高Q纳米腔，集成于拓扑波导网络，用于紧凑型谐振器件及增强光与物质的相互作用。
英文摘要
Valley photonic crystals enable valley-dependent transport and chirality-selective emission, but incorporating wavelength-scale localization remains challenging. Existing valley-photonic-crystal cavities rely on finite defects or local lattice modifications that require structure-specific optimization and offer limited continuous control. Here, we theoretically and experimentally demonstrate two-dimensional nanocavity confinement using two orthogonal domain walls in a glide-symmetric valley photonic crystal. A valley domain wall confines the guided interface mode transversely, while an SSH-like domain wall localizes it longitudinally. Starting from a glide-symmetry-protected Dirac point in a bearded-interface waveguide, controlled displacements of adjacent triangular holes open a topological gap in the continuous guided-mode dispersion. The displacement amplitude $ΔR$ tunes the gap, mode volume, and intrinsic radiative $Q$ factor. Implemented in a silicon photonic-crystal slab, the structure exhibits localized resonances within the topological mode gap and systematic spectral tuning with $ΔR$. The maximum measured loaded $Q$ factor is $1.2\times10^{4}$. This approach enables continuously tunable, high-$Q$ nanocavities integrated into topological waveguide networks for compact resonant devices and enhanced light--matter interactions.
Comments32 pages, 10 figures
