Electric dipole origin of the second harmonic generation of small metallic particles
Electric dipole origin of the second harmonic generation of small metallic particles
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DOI：
10.1103/physrevb.71.165407
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发表时间：
2005-04-01
影响因子：
3.7
通讯作者：
Brevet, PF
中科院分区：
文献类型：
--
作者：
Nappa, J;Revillod, G;Brevet, PF
对金金属纳米粒子进行了偏振分辨超瑞利散射实验。这些结果明确地表明，纳米颗粒的二次谐波产生过程是纯电偶极子起源的最小的颗粒，而不是纯电四极，并延迟效应发挥较大的尺寸。它还表明，这种电偶极子发射的谐波频率是由于偏离的颗粒形状从一个完美的球体，而不是从缺陷的颗粒的晶体结构。
Polarization-resolved hyper Rayleigh scattering experiments were performed on gold metallic nanoparticles. These results unambiguously indicate that the second harmonic generation process of a nanoparticle is of pure electric dipole origin for the smallest particles as opposed to pure electric quadrupole, and that retardation effects come into play for larger sizes. It is furthermore demonstrated that this electric dipole emission at the harmonic frequency is due to a deviation of the particle shape from that of a perfect sphere and not from defects in the crystalline structure of the particle.