Observation of self-trapping and rotation of higher-band gap solitons in two-dimensional photonic lattices

被引:7
作者
Xia, Shiqiang [1 ]
Song, Daohong [1 ]
Zong, Yuanyuan [1 ]
Tang, Liqin [1 ]
Chen, Zhigang [1 ,2 ]
机构
[1] Nankai Univ, TEDA Appl Phys Inst & Sch Phys, MOE Key Lab Weak Light Nonlinear Photon, Tianjin 300457, Peoples R China
[2] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA
基金
中国国家自然科学基金;
关键词
WAVE-GUIDE ARRAYS; DISCRETE SOLITONS; VORTICES;
D O I
10.1364/OE.23.004397
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We demonstrate self-trapping and rotation of higher-band dipole and quadruple-like gap solitons by single-site excitation in a two-dimensional square photonic lattice under self-focusing nonlinearity. Experimental results show that the second-band dipole gap solitons reside in the first photonic (Bragg reflection) gap, whereas the quadruple-like gap solitons are formed in an even higher photonic gap, resulting from modes of the third-band. Moreover, both dipole and quadruple-like gap solitons exhibit dynamical rotation around the lattice principle axes and the direction of rotation is changing periodically during propagation, provided that they are excited under appropriate initial conditions. In the latter case, the nonlinear rotation is accompanied by periodic transitions between quadruple and doubly-charged vortex states. Our numerical simulations find good agreement with the experimental observations. (C) 2015 Optical Society of America
引用
收藏
页码:4397 / 4405
页数:9
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