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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Computer simulation of surface-enhanced Raman scattering in nanostructured metamaterials
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Computer simulation of surface-enhanced Raman scattering in nanostructured metamaterials

机译：纳米结构超材料中表面增强拉曼散射的计算机模拟

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摘要

The simulation of local field fluctuations and surface-enhanced Raman scattering in percolation systems at the percolation threshold is described. An approximate real-space renormalization group method was used in the simulation. It allows one to radically reduce the computation time compared to an exact calculation and to obtain detailed information about the electromagnetic field. The local fields in real macroscopic systems can be calculated by using this approximation. A computer simulation of the local fields in metal island (percolation) films has been performed by the developed method. The calculation has confirmed the existence of giant local field fluctuations. In turn, the local electric field excites Raman scattering. The local fields of surface-enhanced Raman scattering have been calculated for the first time. The dependence of the Raman scattering enhancement factor on the reference frequency and Stokes shift has been derived. An experimental observation of this dependence could be considered as a confirmation of the electromagnetic nature of the enhancement.
机译：描述了在渗滤阈值下渗滤系统中的局部场波动和表面增强拉曼散射的模拟。仿真中使用了近似的实空间重归一化组方法。与精确的计算相比，它可以从根本上减少计算时间，并获得有关电磁场的详细信息。可以使用此近似值来计算实际宏观系统中的局部场。通过开发的方法对金属岛（渗滤）膜中的局部场进行了计算机模拟。计算结果证实存在巨大的局部场波动。反过来，局部电场激发拉曼散射。首次计算了表面增强拉曼散射的局部场。已经得出了拉曼散射增强因子对参考频率和斯托克斯频移的依赖性。对这种依赖性的实验观察可以被认为是增强的电磁性质的确认。

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