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arXiv · 2412.00698

Nearfield Vortex Dynamics of Supercell Bloch Modes

Xiaona Ye·Guangfeng Wang·Xiaoyang Duan·Ziwei Wang·Zengya Li·Tongtong Jia·Tingxin Li·Luqi Yuan·Bo Wang·Xianfeng Chen
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Abstract

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.

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Xiaona Ye, Guangfeng Wang, Xiaoyang Duan, Ziwei Wang, Zengya Li, Tongtong Jia, Tingxin Li, Luqi Yuan, Bo Wang, Xianfeng Chen. 2024-12-01. Nearfield Vortex Dynamics of Supercell Bloch Modes. https://doi.org/10.1103/svcj-vgzw

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