Surface-enhanced Raman scattering on dual-layer metallic gratingstructures  

作　　者：GUAN ZhiQiang HAKANSON Ulf ANTTU Nicklas WEI Hong XU HongQi MONTELIUS Lars XU HongXing 

机构地区：[1]Nanoscale Physics and Devices Laboratory, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2]Division of Solid State Physics/The Nanometer Structure Consortium, Lund University, Lund S-221 00, Sweden

出　　处：《Chinese Science Bulletin》2010年第24期2643-2648,共6页

基　　金：supported by the International S&T Cooperation Program of China(2006DFB02020);the National Basic Research Program of China(2007CB936800 and 2009CB930704);the Hundred Talents Program of the Chinese Academy of Sciences.

摘　　要：Dual-layer Metallic grating(DMG)structures as surface-enhanced Raman scattering(SERS)substrates are studied using benzenethiol as the probe analyte.The DMG structure consists of a SiO2 grating and 100-nm-thick gold coating layers.An enhancement factor of 105 is achieved by optimizing the SiO 2 grating height within the range from 165 to 550 nm.The enhancement factor dependence on the SiO2 grating height is due to the surface plasmon excitation,which is dependent on the polarization of the incident light,and confirmed by finite difference time domain simulations.This study demonstrates the advantages of high uniformity,reproducibility and sensitivity in the DMG structures for SERS applications.Dual-layer Metallic grating （DMG） structures as surface-enhanced Raman scattering （SERS） substrates are studied using benzenethiol as the probe analyte. The DMG structure consists of a SiO2 grating and 100-nm-thick gold coating layers. An enhancement factor of 105 is achieved by optimizing the SiO2 grating height within the range from 165 to 550 nm. The enhancement factor dependence on the SiO2 grating height is due to the surface plasmon excitation, which is dependent on the polarization of the incident light, and confirmed by finite difference time domain simulations. This study demonstrates the advantages of high uniformity, reproducibility and sensitivity in the DMG structures for SERS applications.

关 键 词：表面增强拉曼散射 光栅结构 双层金属 表面增强拉曼光谱 二氧化硅 表面等离子体 有限差分模拟 增强因子 

分 类 号：O657.37[理学—分析化学] TQ597.92[理学—化学]