Origin of optical second-harmonic generation in spherical gold nanoparticles: Local surface and nonlocal bulk contributions
Origin of optical second-harmonic generation in spherical gold nanoparticles: Local surface and nonlocal bulk contributions
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DOI：
10.1103/physrevb.82.235403
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发表时间：
2010-12-01
影响因子：
3.7
通讯作者：
Brevet, P-F
中科院分区：
文献类型：
--
作者：
Bachelier, G.;Butet, J.;Brevet, P-F
对150 nm球形金纳米粒子的二次谐波产生进行了理论和实验研究。我们证明了偶极和八极等离子体激元之间的干涉效应可以作为一个指纹来区分本地表面和非本地批量的二次谐波产生的贡献。通过对实验数据与有限元法模拟计算的电场进行拟合，评价了表征非线性源效率的Rudnick和Stern参数，并对流体动力学模型和局域密度近似方法的有效性进行了讨论。
The second-harmonic generation of 150 nm spherical gold nanoparticles is investigated both experimentally and theoretically. We demonstrate that the interference effects between dipolar and octupolar plasmons can be used as a fingerprint to discriminate the local surface and nonlocal bulk contributions to the second-harmonic generation. By fitting the experimental data with the electric fields computed with finite-element method simulations, the Rudnick and Stern parameters weighting the relative nonlinear sources efficiencies are evaluated and the validity of the hydrodynamic model and the local density approximation approaches are discussed.