Ruslan Röhrich, Chris Hoekmeijer, C. I. Osorio, A. Koenderink
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Polarimetric and interferometric measurement of orbital angular momentum imparted by single plasmon nano-antennas
We report an experimental technique for quantitative analysis of amplitude, phase, directivity and polarization of wavefronts scattered by single nano-objects. As a demonstration we quantify the spin and orbital angular momentum imposed by plasmonic spiral nano-antennas.