作　　者： ; ;

机构地区： 华南师范大学信息光电子科技学院

出　　处： 《应用激光》 2013年第4期355-358,共4页

摘　　要： 应用离散偶极子近似的方法计算了L型金纳米棒双体结构的表面等离子体共振引起的消光光谱及其近场电场分布。研究表明在入射光的偏振方向为45°时双体结构的消光谱峰位发生蓝移;当入射光的偏振方向为135°时,双体结构的消光谱峰位发生红移。两根纳米棒间距较小时,由于相邻金纳米棒之间的电场强耦合作用,表面等离子体杂化出现新的共振能级,两根金纳米棒的连接处出现强的电场分布,这些结果对于金纳米棒结构在表面增强拉曼散射方面有一定的参考意义。 The extinction spectra and field distribution of the surface plasmon coupling of L-shaped Au nanorod dimer structure are calculated by the discrete dipole approximation. It is demonstrated that the peaks of extinction spectra will be blue-shifted when the polarization direction of incident light is 45 degrees, while peaks will be red-shifted when the polarization direction of incident light is 135 degrees. Stronger local electric field distribution occurs at small separation distance and hybridization of surface plasmon leads to new energy levels for L-shaped Au nanorod dimer structure, resulting in an enhancement of field distribution around Au nanorods connection. The calculation results are expected to have potential applications in surface enhanced Raman scattering.

关 键 词： 金属纳米棒 表面等离子体共振 消光光谱 场分布

领　　域： [一般工业技术]