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Free keywords:
CYLINDRICAL-VECTOR BEAMS; PLASMON RESONANCE; SURFACE-PLASMONS; LIGHT;
NANOPRISMS; NANOANTENNA; EMISSION; DEVICES; RANGE; SHAPEPhysics;
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. (C) 2015 AIP Publishing LLC.