应用边界元法分析金属纳米粒对入射光的响应

Analysis of the Response of the Metallic Nanoparticle to the Light with the Boundary Element Method

应用边界元方法(BEM),研究单个金属纳米粒与光的相互作用,以及耦合金属纳米粒与不同方向人射光的相互作用.结果表明:对于不同半径的单个金属纳米粒,对应有不同的谐振入射光波长和不同的谐振条件下的场分布;对于3个耦合金属纳米粒,在不同方向入射光的照射下,会有不同的谐振波长和场分布.这些结果可以应用于光通信技术,集成纳米光子学和微小光学元器件的设计中,微粒耦合产生的局部场增强还可以应用于表面增强拉曼光谱学(SERS)实验和单个分子的探测.

The Boundary Element Method （BEM） is applied to investigate the interaction of light with single metallic nanoparticle and the interaction of light having different incident angle with coupled metallic nanoparticles. The result shows that there is different resonant wavelength and field distribution for the different single metallic nanoparticle with different radius. For three coupled metallic nanoparticles, it will have different reso- nant wavelength and field distribution for different incident angle. These results can be applied to optical communication technology, integrated nanophotonics and the designing of nanoscale optical devices. The enhancing of the local electric field intensity can be used for Surface Enhanced Raman Spectroscopy（SERS） experiment and single molecule detection.