Gap solitons in photorefractive medium with PT-symmetric optical lattices

Title
Gap solitons in photorefractive medium with PT-symmetric optical lattices
Authors
정영대
Keywords
COMPETING NONLINEARITY; SPATIAL SOLITONS; CRYSTALS; SPECTRA
Issue Date
2015-03
Publisher
ELSEVIER SCIENCE BV
Citation
PHYSICS LETTERS A, v. 379, Page. 676-679
Abstract
We find the existence and stability conditions of semi-infinite gap solitons in photorefractive media with parity and time (PT) reversal symmetric complex optical lattices. When the strength of the gain/loss term of complex potential is below the critical value, where the PT-symmetry of the system is unbroken, both the finite and semi-infinite bandgap solitons can exist. The dynamical propagation, Vakhitov-Kolokolov (VK) stability criterion, and linear perturbation stability analysis confirm the stability of the semi-infinite bandgap solitons. All gap solitons in the finite bandgap are found to be dynamically unstable even though they satisfy the VK criterion for stability. We reveal that for the complex potential strength above the critical value only unstable semi-infinite bandgap solitons exist due to the presence of complex propagation constant as a result of the broken PT-symmetry. (C) 2014 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0375960114012717http://hdl.handle.net/20.500.11754/22778
ISSN
0375-9601; 1873-2429
DOI
http://dx.doi.org/10.1016/j.physleta.2014.12.031
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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