1064nm激励下的表面增强拉曼散射效应仿真及优化

Simulation and optimization of SERS effect under the 1064 nm excitation

利用有限元方法建立了周期性三角银柱结构的表面增强拉曼散射(SERS)仿真模型,并与已发表的时域有限差分模型结构相比较,验证了模型的正确性。在1064 nm波长激发下,对不同三角形纳米粒子结构基底的SERS效应进行了仿真,并与相同结构常用波段激励下的SERS效应进行了比较分析。仿真结果表明,对于该三角柱结构模型,1064 nm激励下三角柱结构与常用波段一样具有较强的增强因子,并在入射角为62°、高100 nm、厚度为13 nm时可产生最大的增强因子。

A triangular column structure surface enhanced Raman scattering （SERS） simulation model is established by finite element method and compared with published experimental model estab- lished by finite difference time domain method （FDTD）. The result proves the accuracy of the model. In 1064 nm wavelength excitation, simulation is carried out for different triangular nanoparticles SERS effect of substrate, and compared with the same particle structure in common wavelength excitation SERS effect. The simulation results show that, for the triangular column structure model, triangular column structure has strong Raman enhancement in 1064 nm excitation as same as the common wavelength exci- tation;and when the incident angle is 62° ,the length of the height is 100 nm,the thickness is 13 nm,the structure can produce the maximum Raman enhancement.