Dipole and quadrupole solitons in optically-induced two-dimensional defocusing photonic lattices

PHYSICA D-NONLINEAR PHENOMENA

卷:237

Article

Susanto, H.¹  Law, K. J. H.¹  Kevrekidis, P. G.¹  Tang, L.²  Lou, C.²  Wang, X.³  Chen, Z.^2,3 

[1] Univ Massachusetts, Dept Math & Stat, Amherst, MA 01003 USA

[2] Nankai Univ, Minist Educ, Key Lab Weak Light Nonlinear Photon, Tianjin 300457, Peoples R China

[3] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA

关键词: Dipoles;    Quadrupoles;    Solitons;    Defocusing photonic lattices;   

DOI  :  10.1016/j.physd.2008.05.017

来源: Elsevier

【 摘 要 】

Dipole and quadrupole solitons in a two-dimensional optically induced defocusing photonic lattice are theoretically predicted and experiment ally observed. It is shown that in-phase nearest-neighbor and out-of-phase next-nearest-neighbor dipoles exist and can be stable in the intermediate intensity regime. There are also different types of dipoles that are always unstable. In-phase nearest-neighbor quadrupoles are also numerically obtained, and may also be linearly stable. Out-of-phase, nearest-neighbor quadrupoles are found to be typically unstable. These numerical results are found to be aligned with the main predictions obtained analytically in the discrete nonlinear Schrodinger model. Finally, experimental results are presented for both dipole and quadrupole structures, indicating that self-trapping of such structures in the defocusing lattice can be realized for the length of the nonlinear crystal 10 mm). (C) 2008 Elsevier B.V. All rights reserved.

【 授权许可】

Free