标题： 超胞布洛赫模式的近场涡旋动力学 显示英文标题

标题： Nearfield Vortex Dynamics of Supercell Bloch Modes

摘要： 高对称性的光子晶体 Bloch 模式自然会形成密集排列的光学涡旋。然而，严格的对称性约束限制了近场涡旋的空间构型，从而限制了对光与物质相互作用的控制。在这里，我们展示了超胞光子晶体内的近场涡旋动力学。通过引入三角结构的配对旋转，我们实现了从倏逝谷模式到连续区束缚态、受挫模式和准谷模式的高品质因子 Bloch 模式转变。每个阶段都表现出独特的近场涡旋分布、非线性重叠性质和品质因数，揭示了调节光与物质相互作用的不同物理行为。值得注意的是，受挫模式的非对称涡旋构型增强了二次谐波产生，这是由于优化了非线性重叠因子。我们的配对旋转策略提供了一个通用的设计框架，用于创建具有独特近场涡旋特性的超胞光子晶体，在激光、非线性光学和光学力方面展现出广阔的应用前景。 显示英文摘要

摘要： Densely arranged optical vortices are natural solutions of high-symmetry Bloch modes in photonic crystals. However, strict symmetry constraints limit the potential spatial configurations of nearfield vortices, restricting the control over light-matter interaction. Here, we demonstrate a nearfield vortex dynamic within a supercell photonic crystal. By introducing paired rotations of triangular structures, we achieve high-quality-factor Bloch mode transition from evanescent valley modes, to quasi-bound states in the continuum, frustrated modes, and quasi-valleys. Each stage exhibits distinct nearfield vortex distributions, nonlinear overlap properties, and quality factors, revealing diverse physical behaviors for tailoring light-matter interaction. Notably, the asymmetric vortex configuration of frustrated modes enhances second harmonic generation, driven by an optimized nonlinear overlap factor. Our paired-rotation strategy offers a versatile design framework for creating supercell photonic crystals with unique nearfield vortex properties, presenting promising applications in lasing, nonlinear optics and optical forces.