Individual Ag Nanowire Dimer for Surface-Enhanced Raman Scattering
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We have investigated the polarization-dependent surface-enhanced Raman scattering (SERS) of an individual Ag nanowire (AgNW) dimer, which contains two parallel closely packed AgNWs with very different lengths. Similar cos2 θ dependence of signal intensities with respect to the polarization angle θ of the incident laser was observed from the dimeric part and the parts of the body as well as the tip of the longer AgNW. The dimeric part was demonstrated to exhibit the strongest SERS effect. The results agree well with our numerical simulations of the electric field distributions using finite element method. The SERS enhancement mechanisms at different parts of the dimer were also discussed which are different in origin.
KeywordsAg nanowires (AgNWs) Dimer Surface-enhanced Raman scattering (SERS) Electromagnetic (EM) coupling
This work was financially supported by the National Natural Science Foundation of China (nos. 11004103 and 60808026), the NUAA research funding (nos. NS2010186 and NS2010195), China Postdoctoral Science Foundation-funded project (nos. 20100471332 and 20110491420), Natural Science Foundation of Jiangsu Province (no. BK2010499), and Jiangsu Planned Projects for Postdoctoral Research Funds (nos. 0902016C and 1001038C).