Spiraling light: from donut modes to a Magnus effect analogy
- URL: http://arxiv.org/abs/2109.03937v2
- Date: Thu, 4 Nov 2021 12:47:20 GMT
- Title: Spiraling light: from donut modes to a Magnus effect analogy
- Authors: Robert J.C. Spreeuw
- Abstract summary: Coupling of transverse orbital and spin angular momentum in tightly focused laser beams produces interesting new effects.
Optical vortex beams carry orbital angular momentum (OAM), which emerged in Leiden about 30 years ago.
New avenues to control the state of motion of atoms in optical tweezers as well as potential applications in quantum gates and interferometry.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The insight that optical vortex beams carry orbital angular momentum (OAM),
which emerged in Leiden about 30 years ago, has since led to an ever expanding
range of applications and follow-up studies. This paper starts with a short
personal account of how these concepts arose. This is followed by a description
of some recent ideas where the coupling of transverse orbital and spin angular
momentum (SAM) in tightly focused laser beams produces interesting new effects.
The deflection of a focused light beam by an atom in the focus is reminiscent
of the Magnus effect known from aerodynamics. Momentum conservation dictates an
accompanying light force on the atom, transverse to the optical axis. As a
consequence, an atom held in an optical tweezer will be trapped at a small
distance of up to $\lambda/2\pi$ away from the optical axis, which depends on
the spin state of the atom and the magnetic field direction. This opens up new
avenues to control the state of motion of atoms in optical tweezers as well as
potential applications in quantum gates and interferometry.
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