Remote Excitation Polarization-Dependent Surface Photochemical Reaction by Plasmonic Waveguide
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For the first time, we report remote excitation polarization-dependent surface photochemical reaction by plasmonic waveguide. Remote excitation polarization-dependent surface-enhanced Raman scattering (SERS) spectra indicate a surface photochemical reaction that p-aminothiophenol is converted to p,p′-dimercaptoazobenzene (DMAB) induced by the plasmonic waveguide. Surface plasmon polaritons generated at the end of a silver nanowire can propagate efficiently along the nanowire, and be coupled by nanoparticles near the nanowire as a nanoantenna. Massive electromagnetic enhancement is generated in the nanogap between the nanowire and the nanoparticles. The remote excitation polarization-dependent SERS spectra can be obtained experimentally in the nanogaps; furthermore, the remote excitation polarization-dependent SERS spectra of DMAB reveal the occurrence of this surface catalytic reaction. Theoretical simulations using finite-difference time-domain methods strongly support our experimental results.
KeywordsRemote excitation Polarization-dependent Surface photochemical reaction Plasmonic waveguide
This work was supported by the National Natural Science Foundation of China (grant nos. 90923003, 10874234, 20703064, and 10904171). We thank Dr. Steven L. Suib for helpful suggestions.
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