Hyper-Rayleigh scattering and hyper-Raman scattering of dye-adsorbed silver nanoparticles induced by a focused continuous-wave near-infrared laser
Hyper-Rayleigh scattering and hyper-Raman scattering of dye-adsorbed silver nanoparticles induced by a focused continuous-wave near-infrared laser
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DOI：
10.1063/1.2172733
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发表时间：
2006-02-20
影响因子：
4
通讯作者：
Masuhara, H
中科院分区：
文献类型：
--
作者：
Itoh, T;Ozaki, Y;Masuhara, H
我们报告了超瑞利散射，表面增强超拉曼散射，和双光子激发发光间歇发生聚焦连续波近红外（cw-NIR）激光到胶体银溶液，包括罗丹明6 G（R6 G）和氯化钠（NaCl）。另一方面，在不含R6 G和NaCl的胶体银中观察到连续的超瑞利散射，表明超拉曼散射和双光子激发发光都是由R6 G引起的，其间歇性特征取决于胶体的分散性。这些结果表明，cw-NIR激光有三个角色：非线性响应的来源，纳米粒子的光学捕获，并使纳米粒子聚集体具有高活性的非线性响应。
We report that hyper-Rayleigh scattering, surface-enhanced hyper-Raman scattering, and two-photon excited luminescence occur intermittently by focusing a continuous-wave near-infrared (cw-NIR) laser into a colloidal silver solution including rhodamine 6G (R6G) and sodium chloride (NaCl). On the other hand, continuous hyper-Rayleigh scattering is observed from colloidal silver free from R6G and NaCl, demonstrating that hyper-Raman scattering and two-photon excited luminescence are attributed to R6G and their intermittent features are dependent on the colloidal dispersion. These results suggest that the cw-NIR laser has three roles; the source of the nonlinear response, optical trapping of nanoparticles, and making nanoparticle aggregates possessing the high activity for the nonlinear response.