Open AccessLocalization and oscillation of optical beams in Moiré lattices
Author(s) -
Rui-Dong Xue,
Wei Wang,
Luqi Wang,
HaoLin Chen,
Ruipeng Guo,
Jing Chen
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.005788
Subject(s) - physics , talbot effect , optics , beam (structure) , oscillation (cell signaling) , light beam , optical lattice , beam splitter , excitation , lattice (music) , bragg's law , diffraction , laser , condensed matter physics , quantum mechanics , superfluidity , genetics , acoustics , biology
We study the propagation of optical beams in two-dimensional Moiré lattices, and demonstrate position-dependent beam dynamics when a quasi-Bragg condition is satisfied. We show that when the optical beam is incident to a peak of the lattice envelop, an optical Zitterbewegung is obtained. If the optical beam is incident to a node of the envelop, a field localization effect takes place. The localized beam oscillates with a much larger spatial period than that of the optical Zitterbewegung. Variation of the oscillation period versus the split in periods is discussed. The position-dependent beam dynamics are explained by the excitation of proper bandedge eigenmodes of the Moiré lattice, and can be engineered via tuning the periods of the two superimposed Bragg lattices.