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Optical Manipulation and Structured Materials Conference (OMC)

What will be done by optical manipulation of magnetically trapped superconducting micro-particles?

Masaaki Ashida, Shota Sasaki, Jun Naoi, Masato Takamune, Daisei Kondo, Yuta Takahashi, M. Kumakura, Yoshiki Moriwaki

Published Sep 20, 2023• 0 citations
Publisher

Abstract

Magnetic trapping and optical manipulation of micro-particles are combined in superfluid helium. Irradiation of pulsed light to a magnetically trapped superconducting particle causes simple damped oscillation of the particle. The analysis of the trajectory gives rise to the estimation of viscosity of the superfluid helium along with some properties of the trapped particle.

DOI
10.1117/12.3008353

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Magnetic trapping and optical manipulation of micro-particles are combined in superfluid helium. Irradiation of pulsed light to a magnetically trapped superconducting particle causes simple damped oscillation of the particle. The analysis of the trajectory gives rise to the estimation of viscosity of the superfluid helium along with some properties of the trapped particle.
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We demonstrate the trapping of millimeter-scale superfluid helium drops in high vacuum. The drops are sufficiently isolated that they remain trapped indefinitely, cool by evaporation to 330 mK, and exhibit mechanical damping that is limited by internal processes. The drops are also shown to host optical whispering gallery modes. The approach described here combines the advantages of multiple techniques, and should offer access to new experimental regimes of cold chemistry, superfluid physics, and optomechanics.
Superfluid helium is an important model system to study quantum hydrodynamics. Numerous researches have been reported on fascinating phenomena including superfluidity, unusually low viscosity, and the emergence of the quantum vortex. Here, we demonstrated the visualization of the quantum vortices, which are intrinsically unable to be seen. We prepared many nanoparticles in superfluid helium by using the laser ablation technique. The fabricated nanoparticles are trapped at the core of the quantum vortices. By imaging the scattered light from the nanoparticles, we visualized the motion of the quantum vortices.
A magneto-optic trap for micro-objects is described. Magnetic beads were trapped by optical tweezers while being rotated by a new integrated magnetic manipulator. Rotation was achieved with eight electromagnets with tip-pole geometry. The time orbital potential technique was used to achieve rotation of magnetic beads. Trapping in three dimensions and rotation of magnetic beads on three axes are demonstrated with forces up to 230 pN and force momenta of up to 10(-16)N m . A position-detection apparatus based on an interferometric scheme provides nanometer sensitivities in a few milliseconds.