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Appl. Phys. Express 1 (2008) 092401 (3 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Direct Evidence of Chemical Contribution to Surface-enhanced Hyper-Raman Scattering

Almar Palonpon1, Taro Ichimura1,2, Prabhat Verma1,2,3, Yasushi Inouye1,2,3, and Satoshi Kawata1,2,4

1Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
2CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 322-0012, Japan
3Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka 565-0871, Japan
4RIKEN, Wako, Saitama 351-0198, Japan

(Received July 14, 2008; accepted August 8, 2008; published online August 29, 2008)

We report on halide-ion-assisted chemical effect in surface-enhanced hyper-Raman scattering of crystal violet (CV) adsorbed on single silver aggregate. A dramatic increase in spectral intensity was observed in the presence of halide ions as compared to their absence. By measuring the hyper-Rayleigh scattering from single aggregate treated with and without halide ions, we established that it was chemical effect, rather than electromagnetic effect that was responsible for this strong enhancement. We attribute the enhancement to a charge transfer mechanism between CV and metal surface mediated by the halide ions similar to surface-enhanced Raman scattering. ©2008 The Japan Society of Applied Physics

URL: http://apex.ipap.jp/link?APEX/1/092401/
DOI: 10.1143/APEX.1.092401


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