Nonlinear Optical Response of a CdS-Coated Ag Particle
Nonlinear Optical Response of a CdS-Coated Ag Particle
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DOI：
10.1143/apex.1.062003
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发表时间：
2008-05
影响因子：
2.3
通讯作者：
T. Okamoto;H. Koizumi;M. Haraguchi;M. Fukui;A. Otomo
中科院分区：
文献类型：
--
作者：
T. Okamoto;H. Koizumi;M. Haraguchi;M. Fukui;A. Otomo
本文通过实验观察了室温下cds包覆银粒子的光学非线性特性。利用可调光学参量放大系统产生的亚皮秒脉冲，我们证实了在光子能量高于CdS带间吸收边缘对应能量时，粒子散射的光强随入射光强的增加而显著降低。本文的非线性现象是在局域表面等离子体增强CdS中的双光子吸收，使价电子被激发到CdS的导带，并在没有额外能量供应的情况下进一步移动到Ag的更高能带的情况下观察到的。
In this paper, we present an experimental observation of the optical nonlinear characteristics of a CdS-coated Ag particle at room temperature. By using sub-picosecond pulses generated by a tunable optical parametric amplification system, we confirm that the light intensity scattered by the particle considerably decreases with an increase in the incident light intensity at a photon energy higher than the energy corresponding to the interband absorption edge of CdS. The nonlinear phenomena presented in this paper are observed in an event in which localized surface plasmons enhance the two-photon absorption in CdS and cause the valence electrons to be excited into the conduction band of CdS and to further move to a higher energy band of Ag without additional energy supply.