Light switching between localized and delocalized states in chiral moiré-like photonic lattice

Abstract

We constructed a chiral moiré-like lattice pattern by the interference between two sets of plane waves and two circular polarized beams. The study shows that the intensity distributions of the lattice pattern are a moiré-like structure in the transverse direction and a spiral structure in the longitudinal direction. By tuning the relative rotation angle between two sets of beams, moiré-like lattice pattern can be switched between periodic to aperiodic systems. Further, we numerically study the impacts of relative rotation angle, the screw pitch of the lattice waveguide, the width and incident direction of the probe beam on the light behavior in chiral moiré-like photonic lattice fabricated with photon-induction method. It turns out that light propagation can be switched between localization and delocalization. Our study enriches the physical content of moiré-like lattice patterns and paves a novel way to the light modulation in photonic lattices.