Surface plasmon resonance enhanced second-harmonic generation in Kretschmann configuration
Surface plasmon resonance enhanced second-harmonic generation in Kretschmann configuration
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DOI：
10.1016/j.optcom.2004.11.094
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发表时间：
2005-04
影响因子：
2.4
通讯作者：
R. Naraoka;H. Okawa;K. Hashimoto;K. Kajikawa
中科院分区：
文献类型：
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作者：
R. Naraoka;H. Okawa;K. Hashimoto;K. Kajikawa
我们报道了在具有Kretschmann结构的衰减全反射（ATR）几何结构中，在表面等离子体共振（SPR）下从薄金膜中产生二次谐波（SHG）。观察到的SHG强度比薄金膜表面处的菲涅耳反射几何形状中的反射SHG强度大350-400倍。在覆盖有半花青单层的薄金膜的情况下观察到类似的增强。这些结果表明，薄金膜的SHG源位于该膜之外。基于该模型的模拟得到的增强因子为1.285，与实验结果一致，而假设SHG源位于金薄膜内部的模拟给出了超过6000的因子。该模型与金属中SHG的流体动力学模型一致，其中非线性电流在大块金属外部运行，并且电子密度在它们的界面处从金属穿透到空气。
We report second-harmonic generation (SHG) from a thin gold film at surface plasmon resonance (SPR) in an attenuated total reflection (ATR) geometry having the Kretschmann configuration. The SHG intensity was observed to be 350–400 larger than the reflected SHG intensity in the Fresnel reflection geometry at the surface of the thin gold film. A similar enhancement was observed in the case of a thin gold film covered with a hemicyanine monolayer. These results suggest that the SHG source of the thin gold film is located outside this film. Simulation based on this model yields an enhancement factor of ∼285, in agreement with the experimental results, whereas the simulation supposing that the SHG source is located inside the gold thin film gives a factor of over 6000. This model is consistent with a hydrodynamic model of SHG in a metal, in which the nonlinear current runs outside the bulk metal and the electron density penetrates from the metal to the air at their interface.