Periodic evolution of the out-of-phase dipole and the single-charged vortex solitons in periodic photonic moire lattice with saturable self-focusing nonlinearity media

We survey the propagation properties of the out-of-phase (OOP) dipole solitons and the single-charged vortex (SCV) soliton in a periodic photonic moire lattice with theta = arctan(3/4) under self-focusing nonlinearity media. Since the rotation angle, periodic photonic moire lattices have peculiar energy band structures, with highly flat bands and the bandgaps being much more extensive, which is very favorable for the realization and stability of the solitons. When exciting a single point on-site with the OOP dipole beam, its evolution shows a periodic rollover around the lattice axis. Whereas, when exciting a single point on-site with the SCV beam, it transmits counterclockwise rotating periodically. Both the OOP dipole solitons and the SVC soliton maintain the local state, but their phase exhibits different variations. The phase of the OOP dipole solitons is flipped, while that of the SCV is rotated counterclockwise. Our work further complements the exploration of solitons in photonic moire lattice with nonlinearity. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement