中国激光, 2016, 43 (12): 1208001, 网络出版: 2016-12-09
中心对称光折变晶体中Kagome型光格子内缺陷孤子的研究
Research on Defect Solitons in Kagome Photonic Lattices in Centrosymmetric Photorefractive Crystals
表面光学 缺陷孤子 光折变晶体 光格子 非线性光学 optics at surfaces defect solitons photorefractive crystal photonic lattices nonlinear optics
摘要
报道了中心对称光折变晶体中Kagome型光格子内缺陷孤子的存在及其稳定性。由于缺陷强度的变化,这些缺陷孤子能存在于不同的带隙内。当缺陷为正时,这些缺陷孤子只存在于半无限带隙内。利用扰动增长率和光波传播法,研究了这些缺陷孤子的稳定性。结果表明,通过扰动增长率和光波传播法得到这些缺陷孤子的稳定性是相同的,低功率正缺陷孤子是稳定的,高功率正缺陷孤子是不稳定的。当缺陷为负时,缺陷孤子存在于半无限带隙和第一带隙内。在半无限带隙内,中功率负缺陷孤子是稳定的,高功率和低功率负缺陷孤子是不稳定的。在第一带隙内,负缺陷孤子都是稳定的。
Abstract
Defect solitons and their stability are reported in Kagome photonic lattices in centrosymmetric photorefractive crystals. These defect solitons exist in different gaps due to the change of defect intensity. When the defect is positive, these defect solitons exist only in the semi-infinite gap. By using the perturbation growth rate and beam propagation method, the stability of these defect solitons is investigated. The analysis indicates that the stability of these defect solitons tested by the perturbation growth rate and beam propagation method is same, the positive defect solitons are stable in the low power region and unstable in the high power region. When the defect is negative, these defect solitons exist both in the semi-infinite gap and the first gap. Negative defect solitons in the semi-infinite gap are stable in the moderate power region and unstable in the high and low power regions. In the first gap, the negative defect solitons are always stable.
张宝菊, 卢克清, 赵冲, 高立许. 中心对称光折变晶体中Kagome型光格子内缺陷孤子的研究[J]. 中国激光, 2016, 43(12): 1208001. Zhang Baoju, Lu Keqing, Zhao Chong, Gao Lixu. Research on Defect Solitons in Kagome Photonic Lattices in Centrosymmetric Photorefractive Crystals[J]. Chinese Journal of Lasers, 2016, 43(12): 1208001.