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20 August 2020 Direct visualization of the spin-orbit angular momentum conversion in optical trapping
Alejandro V. Arzola, Laura Pérez García, Petr Jákl, Lukáš Chvátal, Jaime Donlucas, Giorgio Volpe, Pavel Zemánek, Giovanni Volpe
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Proceedings Volume 11463, Optical Trapping and Optical Micromanipulation XVII; 1146311 (2020) https://doi.org/10.1117/12.2568015
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
A beam of light may possess both spin and orbital angular momentum. In non-paraxial conditions part of the spin converts into orbital angular momentum through the spin-orbit angular momentum conversion phenomenon. This effect has important consequences at the nanoscale, particularly in nano-manipulation and nano-photonics. In this work, we thoroughly analyze the rotation of microscopic beads subjected to a tightly focused Laguerre-Gaussian beam. Particularly, we observe the rotation of particles along circular trajectories that will depend strongly on the combination of topological charges and the state of polarization. Based on Richard and Wolf theory for non-paraxial beam focusing, we found a very good agreement between the experimental results and the theoretical model based on calculation of the optical forces using the generalized Lorenz-Mie theory.
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Alejandro V. Arzola, Laura Pérez García, Petr Jákl, Lukáš Chvátal, Jaime Donlucas, Giorgio Volpe, Pavel Zemánek, and Giovanni Volpe "Direct visualization of the spin-orbit angular momentum conversion in optical trapping", Proc. SPIE 11463, Optical Trapping and Optical Micromanipulation XVII, 1146311 (20 August 2020); https://doi.org/10.1117/12.2568015
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KEYWORDS
Visualization
Dielectric polarization
Particles
Optical tweezers
Dielectrics
Beam analyzers
Elliptical polarization
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