Shen Hong, Nguyen Ngoc, Gachet David, Maillard Vincent, Toury Timothée, Brasselet Sophie
ICD-LNIO, UMR STMR CNRS 6279, Universit´e de Technologie de Troyes 12 rue Marie Curie, CS 42060, 10004 Troyes cedex, France.
Opt Express. 2013 May 20;21(10):12318-26. doi: 10.1364/OE.21.012318.
We report spatial and vectorial imaging of local fields' confinement properties in metal nanoparticles with branched shapes, using Second Harmonic Generation (SHG) microscopy. Taking advantage of the coherent nature of this nonlinear process, the technique provides a direct evidence of the coupling between the excitation polarization and both localization and polarization specificities of local fields at the sub-diffraction scale. These combined features, which are governed by the nanoparticles' symmetry, are not accessible using other contrasts such as linear optical techniques or two-photon luminescence.
我们利用二次谐波产生（SHG）显微镜报告了分支形状金属纳米颗粒中局部场限制特性的空间和矢量成像。利用这种非线性过程的相干性质，该技术直接证明了激发极化与亚衍射尺度下局部场的定位和极化特异性之间的耦合。这些由纳米颗粒对称性决定的综合特征，是使用其他对比度（如线性光学技术或双光子发光）无法获得的。
