Open AccessDefect solitons in two-dimensional optical lattices
Author(s) -
W. H. Chen,
Xing Zhu,
Tin-Wan Wu,
R. H. Li
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.010956
Subject(s) - physics , optics , photorefractive effect , square lattice , nonlinear optics , nonlinear system , condensed matter physics , band gap , lattice (music) , power (physics) , quantum mechanics , laser , acoustics , ising model
We report on the existence and stability of solitons in a defect embedded in a square optical lattice based on a photorefractive crystal with focusing saturable nonlinearity. These solitons exist in different bandgaps due to the change of defect intensity. For a positive defect, the solitons only exist in the semi-infinite gap and can be stable in the low power region but not the high power region. For a negative defect, the solitons can exist not only in the semi-infinite gap, but also in the first gap. With increasing the defect depth, these solitons are stable within a moderate power region in the first gap while unstable in the entire semi-infinite gap.