超分辨拉曼散射成像的偏振调控理论分析  

Theoretical Analysis of Polarization Regulation in Super-Resolution Raman ScatteringImaging

作　　者：刘钊杰 肖康 李文文[1,2] 田立君 王中阳[2] Liu Zhaojie;Xiao Kang;Li Wenwen;Tian Lijun;Wang Zhongyang(College of Sciences,Shanghai University,Shanghai 201900,China;Research Center of Quantum Macro-Phenomenon and Application,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 200120,China)

机构地区：[1]上海大学理学院物理系,上海201900 [2]中国科学院上海高等研究院宏观量子现象与应用研究中心,上海200120

出　　处：《激光与光电子学进展》2019年第20期157-166,共10页Laser & Optoelectronics Progress

基　　金：国家自然科学基金（11674337）;国家科技部项目（2016YFC0100603)

摘　　要：利用表面增强拉曼散射(SERS)技术可增强金属表面某些位置(热点)的电场强度。选定Ag纳米颗粒二聚体这一金属纳米结构体系,研究其作为超分辨SERS成像基底的可行性。采用时域有限差分(FDTD)法,计算分析Ag纳米颗粒二聚体在不同波长和偏振方向的激发光作用下的电场分布特点。结果表明:Ag二聚体的电场分布具有高度局域化的特点,并且Ag二聚体中热点的电场强度可由激发光的偏振方向调控,这使其可以作为实现超分辨SERS成像的基底。Surface-enhanced Raman scattering(SERS)technique can be applied to enhance the electric field intensity at some locations(hot spots)on the metal surface.In this paper,the feasibility for silver dimer to be a substrate for super-resolution SERS imaging is researched.According to the finite-difference time-domain(FDTD)method,the electric field distribution of silver dimer under excitation light of different wavelengths and polarization directions are calculated and studied.The results show that the electric field distribution of silver dimer is highly localized,and the electric field intensity of hot spots in silver dimer can be controlled by the polarization direction of excitation light,which make it an effective substrate to realize super-resolution Raman imaging.

关 键 词：表面光学 Ag二聚体 时域有限差分(FDTD)法 表面增强拉曼散射(SERS) 超分辨成像 

分 类 号：O433.1[机械工程—光学工程]