Laser-induced rotation and cooling of a trapped microgyroscope in vacuum

Yoshihiko Arita (), Michael Mazilu and Kishan Dholakia ()
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Yoshihiko Arita: SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews
Michael Mazilu: SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews
Kishan Dholakia: SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Quantum state preparation of mesoscopic objects is a powerful playground for the elucidation of many physical principles. The field of cavity optomechanics aims to create these states through laser cooling and by minimizing state decoherence. Here we demonstrate simultaneous optical trapping and rotation of a birefringent microparticle in vacuum using a circularly polarized trapping laser beam—a microgyroscope. We show stable rotation rates up to 5 MHz. Coupling between the rotational and translational degrees of freedom of the trapped microgyroscope leads to the observation of positional stabilization in effect cooling the particle to 40 K. We attribute this cooling to the interaction between the gyroscopic directional stabilization and the optical trapping field.

Date: 2013
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DOI: 10.1038/ncomms3374

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