科研之友
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摘要
We report spatial and vectorial imaging of local fields%26apos; 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%26apos; symmetry, are not accessible using other contrasts such as linear optical techniques or two-photon luminescence.
- 出版日期2013-5-20
