Off-axis dipole forces in optical tweezers by an optical analog of the {Magnus} effect

Abstract

It is shown that a circular dipole can deflect the focused laser beam that induces it, and will experience a corresponding transverse force. Quantitative expressions are derived for Gaussian and angular tophat beams, while the effects vanish in the plane-wave limit. The phenomena are analogous to the Magnus effect pushing a spinning ball onto a curved trajectory. The optical case originates in the coupling of spin and orbital angular momentum of the dipole and the light. In optical tweezers the force causes off-axis displacement of the trapping position of an atom by a spin-dependent amount up to $\lambda /2\pi$, set by the direction of a magnetic field. This suggests direct methods to demonstrate and explore these effects, for instance to induce spin-dependent motion.

5 pages, 3 figures; plus 3 pages Supplemental Material (accepted version)

References in corpus (13)

• Probing many-body dynamics on a 51-atom quantum simulator
• An atom-by-atom assembler of defect-free arbitrary 2d atomic arrays
• Angular Momenta and Spin-Orbit Interaction of Nonparaxial Light in Free Space
• An Optical Tweezer Array of Ultracold Molecules
• Alkaline earth atoms in optical tweezers
• Microscopic control and detection of ultracold strontium in optical-tweezer arrays
• Seconds-scale coherence in a tweezer-array optical clock
• Narrow-line cooling and imaging of Ytterbium atoms in an optical tweezer array
• Angular momentum of focused beams: beyond the paraxial approximation
• An atomic array optical clock with single-atom readout
• Wavelength-scale errors in optical localization due to spin-orbit coupling of light
• Sideband cooling of molecules in optical traps
• Number-resolved imaging of ${}^{88}$Sr atoms in a long working distance optical tweezer

Cited by in corpus (2)

• Transverse Polarization Gradient Entangling Gates for Trapped-Ion Quantum Computation
• Spiraling light: from donut modes to a Magnus effect analogy