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  • Letter
  • Open Access

Quadratic optomechanical cooling of a cavity-levitated nanosphere

N. P. Bullier*, A. Pontin†, and P. F. Barker‡

  • Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom

  • *Present address: National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom.
  • †a.pontin@ucl.ac.uk
  • ‡p.barker@ucl.ac.uk

Phys. Rev. Research 3, L032022 – Published 28 July, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L032022

Abstract

We report on cooling of the center-of-mass motion of a nanoparticle via a coupling between its motion and the optical field within a high finesse cavity. The resulting coupling is purely quadratic in displacement and gives rise to a van der Pol nonlinear damping. These dynamics are analogous to conventional parametric feedback where the cavity provides passive feedback without an additional measurement. We show experimentally that as feedback cooling, the resulting energy distribution is strongly nonthermal and can be controlled by the nonlinear damping induced by the cavity. Our work represents a demonstration of a cavity cooling dominated by this type of coupling across all optomechanical platforms.

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