Two-Dimensional Optical Lattice Solitons in Photovoltaic-Photorefractive Crystals  

作　　者：GUO Jian-Bang LU Ke-Qing NIU Ping-Juan YU Li-Yuan XING Hai-Ying 郭建邦;卢克清;牛萍娟;于莉媛;邢海英(State Key Laboratory of Transient Optics and Photonics,Xi'an Institute of Optics and Precision Mechanics,Chinese Academic of Sciences,Xi'an 710119;School of Electronics and Information Engineering,Tianjin Polytechnic University,Tianjin 300160)

机构地区：[1]State Key Laboratory of Transient Optics and Photonics,Xi'an Institute of Optics and Precision Mechanics,Chinese Academic of Sciences,Xi'an 710119 [2]School of Electronics and Information Engineering,Tianjin Polytechnic University,Tianjin 300160

出　　处：《Chinese Physics Letters》2012年第8期127-130,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No 10674176).

摘　　要：We study two families of two-dimensional bright lattice solitons in photovoltaic-photorefractive crystals.It is shown that self-focusing and self-defocusing lattice solitons are possible only when their power level exceeds a critical threshold.It is found that self-focusing lattice solitons exist not only in the semi-infinite band gap,but also in the first band gap,whereas self-defocusing lattice solitons exist only in the first band gap.The structures of these lattice solitons are also analyzed.Our results indicate that a self-focusing lattice soliton in the semi-infinite band gap is more confined than in the first band gap so its tails in the first band gap occupy many lattice sites;when a self-defocusing lattice soliton is close to the second band,the self-defocusing lattice soliton is more confined so its tails occupy a few lattice sites.

关 键 词：SOLITON LATTICE SOLITONS 

分 类 号：O41[理学—理论物理]