竞争非局域向列相液晶中艾里高斯光束的相互作用  

Interaction of Airy Gaussian Beams in Nematic Liquid Crystals with Competing Nonlocality

作　　者：任思琪 浦绍质 梁影 杜明欣 张萌[1] REN Siqi;PU Shaozhi;LIANG Ying;DU Mingxin;ZHANG Meng(School of Measurement and Control Technology and Communication Engineering,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]哈尔滨理工大学测控技术与通信工程学院,哈尔滨150080

出　　处：《光子学报》2024年第4期244-256,共13页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61405049);黑龙江省自然科学基金(Nos.QC2015086,F2016023)。

摘　　要：基于JUNG P S等提出的新型竞争非局域模型数值研究了艾里高斯光束在该模型中的相互作用,采用分步傅里叶算法数值模拟艾里高斯光束在竞争型非局域非线性向列相液晶中的相互作用。结果表明,可以通过调节初始振幅、初始间距、位相差以及非局域程度控制艾里高斯光束间的相互作用。初始振幅增大会使相互作用力增大;分子取向非局域程度的增加导致艾里高斯光束宽度展宽,使反相艾里光束吸引力增强,热非局域程度的改变使初始振幅较大的反相艾里高斯光束由相互排斥作用变为相互吸引作用,使反相艾里高斯光束出现排斥和吸引作用动态平衡;同时还发现增大热非线性系数能使反相艾里高斯光束出现吸引或排斥。In this paper,based on the new competing nonlocal model proposed by JUNG P S et al,the interaction of the Airy Gaussian beam is numerically investigated by the split-step Fourier scheme.Usually,in nonlocal media with competing nonlinearities,the nonlinear refractive index is induced by two types of independent nonlinearities.However,when the beam propagates in the nematic liquid crystal,the nonlinear refractive index will be induced by molecular orientational effects and thermal effects.In this case,the beam propagation in liquid crystals is guided by the model proposed by JUNG P S.According to the new competitive nonlocal model,the refractive index changes induced by the two nonlinear effects are not independent of each other,so the light-induced refractive index change becomes the refractive index change caused by the two nonlinear effects in the form of multiplication.It is shown that the interaction between Airy Gaussian beams can be controlled by the adjustment of the distribution factor,the beam amplitude,beam separation,phase difference,and the nonlocality.The results show that the distribution factors(the degree of molecular orientation nonlocality,thermal nonlinearity coefficient,and the initial spacing)all affect the interaction between the Airy Gaussian beam.Among the above factors,the degree of thermal nonlocality has the smallest effect on the beam interaction under the condition of in-phase or out-of-phase interaction.For in-phase Airy Gaussian beams interaction,the period of the breather obtained from the fusion of the Airy Gaussian beam decreases with the increase of the distribution factor and gradually fuses into quasi-solitons.For the out-of-phase Airy Gaussian beams interaction,the two Airy Gaussian beams became two independent solitons.The angle between the soliton pairs increases with the decrease of the distribution factor.It is found that an increase in the beam amplitude will increase the interaction force.The increase in the nonlocality of the reorientation nonlinearity will lead to an i

关 键 词：艾里高斯光束 相互作用 竞争 非局域 液晶 

分 类 号：O437[机械工程—光学工程]