Direct phase mapping of broadband Laguerre-Gaussian metasurfaces
Optics
2018-07-18 v1
Abstract
We report on the fabrication of metasurface phase plates consisting of gold nanoantenna arrays that generate Laguerre-Gaussian modes from a circularly polarized Gaussian input beam. The corresponding helical phase profiles with radial discontinuities are encoded in the metasurfaces by the orientation of the nanoantennas. A common-path interferometer is used to determine the orbital angular momentum of the generated beams. Additionally, we employ digital holography to record detailed phase profiles of the Laguerre-Gaussian modes. Experiments with different laser sources demonstrate the broadband operation of the metasurfaces.
Keywords
Cite
@article{arxiv.1807.06342,
title = {Direct phase mapping of broadband Laguerre-Gaussian metasurfaces},
author = {Alexander Faßbender and Jiří Babocký and Petr Dvořák and Vlastimil Křápek and Stefan Linden},
journal= {arXiv preprint arXiv:1807.06342},
year = {2018}
}