Towards an optical far-field measurement of higher-order multipole contributions to the scattering response of nanoparticles
arXiv:1411.4808 · doi:10.1063/1.4914117
Abstract
We experimentally show an all-optical multipolar decomposition of the lowest-order Eigenmodes of a single gold nanoprism using azimuthally and radially polarized cylindrical vector beams. By scanning the particle through these tailored field distributions, the multipolar character of the Eigenmodes gets encoded into 2D-scanning intensity maps even for higher-order contributions to the Eigenmode that are too weak to be discerned in the direct far-field scattering response. This method enables a detailed optical mode analysis of individual nanoparticles.
arXiv comment5 pages, 3 figures
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