Generation of Vortex Beams with Strong Longitudinally Polarized Magnetic Field by Using a Metasurface
Abstract
A novel method of generation and synthesis of azimuthally E-polarized vortex beams is presented. Along the axis of propagation such beams have a strong longitudinally polarized magnetic field where ideally there is no electric field. We show how these beams can be constructed through the interference of Laguerre-Gaussian beams carrying orbital angular momentum. As an example, we present a metasurface made of double-split ring slot pairs and report a good agreement between simulated and analytical results. Both a high magnetic-to-electric-field contrast ratio and a magnetic field enhancement are achieved. We also investigate the metasurface physical constraints to convert a linearly polarized beam into an azimuthally E- polarized beam and characterize the performance of magnetic field enhancement and electric field suppression of a realistic metasurface. These findings are potentially useful for novel optical spectroscopy related to magnetic dipolar transitions and for optical manipulation of particles with spin and orbital angular momentum.
Keywords
Cite
@article{arxiv.1409.3547,
title = {Generation of Vortex Beams with Strong Longitudinally Polarized Magnetic Field by Using a Metasurface},
author = {Mehdi Veysi and Caner Guclu and Filippo Capolino},
journal= {arXiv preprint arXiv:1409.3547},
year = {2015}
}
Comments
11 pages, 9 figures