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Computer simulation and experimental verification of high performance optical near-field probe by using surface plasmon polariton gap waveguide

表面等离子体激元间隙波导高性能光学近场探头的计算机模拟与实验验证

基本信息

批准号：
20560035
负责人：
TANAKA Kazuo
金额：
$ 3.16万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

项目摘要

The plasmon gap probe proposed by authors has the characteristics of low optical noise that is the advantage of the aperture probe and of high resolution that is the advantage of the scattering probe.In 2008 and 2009, the complex propagation constants of the plasmon gap waveguide (PGW) have been calculated in order to obtain the optimum shape of the probe. The code of the numerical valuation based on the method of line (MoL) has been made and developed. The complex propagation constants for various shapes of SPGW have been calculated by using the MoL code. Considering these kinds of numerical evaluations, it is found that the staggered structure of SPGW can make a localized and enhanced optical field on the probe tip without increasing the attenuation constant. The basic characteristics of the optical fields, especially vector fields, on the probe tip have been investigated in detail and it is found that they strongly depend on the nanometric structure of the probe tip. These results s … More how that the design of the shape of the probe tip must be carefully performed in the practical applications.In 2010, the computer simulation code used for the evaluation of the plasmonic gap probe, has been improved and extended. In the most of the laboratories who are investigating the subjects in the fields of the plasmonic-nanophotonics, the commercial simulation code based on the FDTD method is employed. Contrary, in the author's laboratory, the hand-made simulation code based on the volume integral equation with iteration method and fast Fourier transformation (VIE-FFT) is employed for the numerical simulations. Comparing the simulation results between by the FDTD and by the VIE-FFT, it is found that the results by VIE-FFT give the more accurate and more useful results than those by FDTD. For example, in the collaborate study with a group of Munster niversity, the authors could obtain the more accurate results than those by FDTD method for the analysis of the optical filed distribution of the tetrahedral plasmonic probe. The reason of these results is based on the facts that the VIE-FFT does not require the numerical stability conditions and absorbing conditions that are essential in the FDTD method and troublesome to set optimum conditions. Furthermore, the VIE-FFT simulation code is extended and improved for the large-scale problems by making the software packeg BLAS double precision and parallel code by the openMP. Less

作者提出的等离子体间隙探针具有孔径探针的低噪声和散射探针的高分辨率的特点，并在2008年和2009年计算了等离子体间隙波导（PGW）的复传播常数，以获得探针的最佳形状。编制了基于直线法的数值计算程序。用MoL程序计算了各种形状的SPGW的复传播常数。通过数值计算发现，SPGW的交错结构可以在不增加衰减常数的情况下，在探针针尖上形成局域化的增强光场。光场的基本特性，特别是矢量场，在探针针尖上进行了详细的研究，发现它们强烈依赖于探针针尖的纳米结构。这些结果s ...更多信息 2010年，用于等离子体间隙探针评估的计算机模拟代码得到了改进和扩展。在等离子体纳米光子学领域的研究中，大多数实验室都采用基于FDTD方法的商业仿真程序。而在作者的实验室中，数值模拟采用的是基于体积积分方程的迭代法和快速傅立叶变换（VIE-FFT）的手编模拟程序。将时域有限差分法和VIE-FFT法的仿真结果进行了比较，发现VIE-FFT法的仿真结果比时域有限差分法的仿真结果更准确，更实用。例如，在与Munster大学的合作研究中，对四面体等离子体探针的光场分布进行了分析，得到了比FDTD方法更精确的结果。这些结果的原因是基于这样的事实，即VIE-FFT不需要数值稳定性条件和吸收条件是必要的FDTD方法和麻烦的设置最佳条件。在此基础上，对VIE-FFT仿真程序进行了扩展和改进，使其具有双精度，并利用openMP实现了BLAS软件包的并行化。少