Self-trapping and oscillation of quadruple beams in high band gap of 2D photonic lattices

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（9）
• 页码范围: 21-24
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL201311.090801

摘要

Higher-band self-trapping and oscillation (rotation) of nonlinear quadruple beams in two-dimensional (2D)square photonic lattices are numerically demonstrated.Under appropriate conditions of nonlinearity,a quadruple-like beam can self-trap into localized modes that reside in the second Bragg reflection gap through single-site excitation.By changing the initial orientation of the incident quadruple beam related to the lattices,periodic oscillations of the localized quadruple mode may be obtained.The localized quadruple state becomes a rotating doubly charged optical vortex (DCV) during rotation and should undergo charge-flipping when the rotating direction is reversed.