超材料中空心高斯光束的自陷动力学
Self-trapped dynamics of a hollow Gaussian beam in metamaterials
摘要：
本文系统地研究了空心高斯光束在超材料中的动力学行为。我们预测了HGB的自陷传输，光束的演化受无量纲色散系数（k）的影响很大，它决定了衍射色散的强度。在具有较高k值的超材料中，HGB的演变，例如单个环形强度图案的消失和具有中心亮点的图案的出现，可以在较小的传播距离下实现。另一方面，具有低k值的超材料可以在长传播距离上保持单环强度分布而不聚焦。当衍射色散强度增加时，它会显著影响光束的演化，并可能导致在中心处形成具有高峰值强度的紧聚焦光束。紧聚焦现象被发现在纳米尺寸颗粒的捕获中具有一些应用。
英文摘要：
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 (k), 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 k. On the other hand, metamaterials with low values of k 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.
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