Remote Excitation of Surface-Enhanced Raman Scattering on Single Au Nanowire with Quasi-Spherical Termini

In this paper, remote excitation of surface-enhanced Raman scattering (SERS) based on propagating surface plasmon polariton (SPP) on single well-defined crystal Au nanowire with quasi-spherical termini has been reported. Considering the terminal shape dependence of propagating SPP on nanowires, we first study the relationship between polarization of incident laser and emission induced by propagating SPP to acquire best Raman signal at quasi-spherical terminus. This result is confirmed by simulation using finite-difference time-domain method. And then, remote excitation of SERS is achieved when polarization of incident laser was parallel to Au nanowire.