Multi-twist polarization ribbon topologies in highly-confined optical fields

Language
en
Document Type
Article
Issue Date
2022-02-15
First published
2019-05-08
Issue Year
2019
Authors
Bauer, Thomas
Banzer, Peter
Bouchard, Frédéric
Orlov, Sergej
Marrucci, Lorenzo
Santamato, Enrico
Boyd, Robert W
Karimi, Ebrahim
Leuchs, Gerd
Editor
Publisher
IOP Publishing
Abstract

Abstract Electromagnetic plane waves, solutions to Maxwell’s equations, are said to be ‘transverse’ in vacuum. Namely, the waves’ oscillatory electric and magnetic fields are confined within a plane transverse to the waves’ propagation direction. Under tight-focusing conditions however, the field can exhibit longitudinal electric or magnetic components, transverse spin angular momentum, or non-trivial topologies such as Möbius strips. Here, we show that when a suitably spatially structured beam is tightly focused, a three-dimensional polarization topology in the form of a ribbon with two full twists appears in the focal volume. We study experimentally the stability and dynamics of the observed polarization ribbon by exploring its topological structure for various radii upon focusing and for different propagation planes.

Journal Title
New Journal of Physics
Volume
21
Issue
5
Citation
New Journal of Physics 21.5 (2019): 053020. <https://iopscience.iop.org/article/10.1088/1367-2630/ab171b>
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