Tunable self-shifting Bloch modes in anisotropic hexagonal photonic lattices

Abstract

We study controllable self-shifting Bloch modes in anisotropic hexagonal photonic lattices. The shifting results from a deformed band structure due to deformation of the index distribution in each unit cell. By reconfiguration of the index profile of the unit cell, the direction in which the Bloch modes move can be controlled. Our theoretical predictions are experimentally demonstrated in hexagonal lattices optically induced in an anisotropic nonlinear crystal.

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

“…In photonics, moiré lattice pattern is reported by the incoherent superposition of two identical sublattice beams [11,12], e.g. tetragonal [13,14] or hexagonal lattice [15,16]. Based on the optical induction method, photonic moiré lattice has been fabricated with moiré lattice pattern [17,18].…”

Discrete solitons and vortices in anisotropic hexagonal and honeycomb lattices

“…In recent years, the emphasis has somewhat shifted from the consideration of the more customary square lattices to the examination of lattices of hexagonal or honeycomb form. There, a source of emphasis has again been localization and self-trapping in the form of solitonic and vortical structures [7][8][9], but also other aspects have been studied including, e.g., Bloch states [10]. A significant fraction of the focus has been on the emulation by these optical systems of "photonic graphene", leading to numerous remarkable features, including the creation, destruction and experimental observation of topologically protected, so-called, edge states [11,12], and also the emergence of pseudospin and angular momentum [13].…”