Nearfield Vortex Dynamics of Supercell Bloch Modes

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.

30 pages, 17 figures

References in corpus (18)

• Asymmetric metasurfaces with high-$Q$ resonances governed by bound states in the continuum
• Resonantly Trapped Bound State in the Continuum Laser
• Individual nanoantennas empowered by bound states in the continuum for nonlinear photonics
• Observation of topological valley transport of sound in sonic crystals
• Observation of intrinsic chiral bound states in the continuum
• A Silicon-on-Insulator Slab for Topological Valley Transport
• Topologically-protected refraction of robust kink states in valley photonic crystals
• Circularly polarized states spawning from bound states in the continuum
• Valley Vortex States in Sonic Crystals
• Selection Rules for Quasi-Bound States in the Continuum
• High-harmonic generation from metasurfaces empowered by bound states in the continuum
• Dirac-vortex topological cavity
• Chi2 and chi3 harmonic generation at a critical power in inhomogeneous doubly resonant cavities
• All-optical polarization and amplitude modulation of second-harmonic generation in atomically thin semiconductors
• Doubly-resonant ${\chi }^{(2)}$ nonlinear photonic crystal cavity based on a bound state in the continuum
• Realization of the kagome spin ice state in a frustrated intermetallic compound
• Doubly resonant second-harmonic generation of a vortex beam from a bound state in the continuum
• Efficient Second Harmonic Generation from Silicon Slotted Nanocubes with Bound States in the Continuum