论文标题
超材料中空心高斯光束的自我捕获的动力学
Self-trapped dynamics of a hollow Gaussian beam in metamaterials
论文作者
论文摘要
我们对超材料中空心高斯梁（HGB）的动力学进行了系统的研究。我们预测HGB的自被捕的传播和光束的演变受到无量纲色散系数（K）的高度影响，这决定了分散性在衍射上的强度。 HGB的演变，例如单个环形强度模式的消失和具有中央亮点的模式的外观，在k值较高的地层中的传播距离较小，而较高的k值则可以实现。另一方面，k值较低的超材料可以在长时间的传播距离内保留单个环强度分布而无需聚焦。当分散强度对衍射的强度增加时，它会显着影响束的演变，并可能导致形成紧密聚焦的光束，中心的峰强度很高。发现紧密聚焦的现象在诱捕纳米化颗粒时具有一些应用。
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.
