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Self-trapped dynamics of a hollow Gaussian beam in metamaterials
Physics Letters A ( IF 2.6 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.physleta.2020.126527
A.K. Shafeeque Ali , M. Lakshmanan

Abstract We present a systematic investigation on the dynamics of a hollow Gaussian beam (HGB) in metamaterials. We predict self-trapped propagation of HGBs and evolution of the beam is highly influenced by dimensionless dispersion coefficient (κ), which determines the strength of dispersion over diffraction. The evolutions of HGBs such as disappearance of single ringed intensity pattern and appearance of patterns with a central bright spot are achievable with less propagation distance in metamaterials with higher values of κ. On the other hand, metamaterials with low values of κ can preserve single ring intensity distribution over a long propagation distance without focusing. When the strength of dispersion over diffraction increases, it significantly influences the evolution of the beam and may lead to the formation of tightly focussed beam with high peak intensity at the center. The phenomenon of tight focussing is found to have some applications in trapping of nanosized particles.

中文翻译:

超材料中空心高斯光束的自陷动力学

摘要 我们对超材料中空心高斯光束 (HGB) 的动力学进行了系统研究。我们预测 HGB 的自陷传播和光束的演化受无量纲色散系数 (κ) 的影响很大,无量纲色散系数 (κ) 决定了衍射上的色散强度。HGB 的演变,例如单环强度图案的消失和具有中心亮点的图案的出现,可以在具有较高 κ 值的超材料中以更短的传播距离实现。另一方面,具有低 κ 值的超材料可以在长传播距离内​​保持单环强度分布而无需聚焦。当衍射上的色散强度增加时,它显着影响光束的演化,并可能导致在中心形成具有高峰值强度的紧密聚焦光束。发现紧密聚焦现象在捕获纳米尺寸的粒子方面有一些应用。
更新日期:2020-07-01
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