Mie scattering of Laguerre-Gaussian beams: photonic nanojets and near-field optical vortices

Abstract

We study Mie scattering of Laguerre-Gaussian (LG) light beams remodelled using the method of far-field matching. The theoretical results are used to analyze the optical field in the near-field region for purely azimuthal LG beams characterized by a nonzero azimuthal mode number $m_{LG}$. The mode number $m_{LG}$ is found to have a profound effect on the morphology of photonic nanojets and the near-field structure of optical vortices associated with the components of the electric field.

22 pages, 7 figures

References in corpus (3)

• Multipole expansion of strongly focussed laser beams
• Excitation of single multipolar modes with engineered cylindrically symmetric fields
• The role of the angular momentum of light in Mie scattering. Excitation of dielectric spheres with Laguerre-Gaussian modes

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• Longitudinal Angular Momentum in Magneto-Mie Scattering: Quantum Vacuum Correction to the Einstein-De Haas effect
• Optical trapping by Laguerre-Gaussian beams: Symmetries, stability and equilibria