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1 August 2021 Linear and quadratic optomechanical cooling of a cavity-levitated nanosphere
Antonio Pontin, Nathanaël P. Bullier, Peter F. Barker
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Proceedings Volume 11798, Optical Trapping and Optical Micromanipulation XVIII; 117980U (2021) https://doi.org/10.1117/12.2594482
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
We report on cooling the center-of-mass motion of a nanoparticle via a coupling between its motion and the optical field of a high finesse cavity. At the core of the experiment is a hybrid trapping potential obtained by overlapping an electrodynamic potential and an optical standing wave. By tuning the experimental parameters, the interaction between the particle and the cavity field can be made linear or purely quadratic in displacement. While both can be exploited for cooling the latter gives rise to a more interesting dynamic. Indeed, the resulting interaction generates a Van der Pol nonlinear damping, which is analogous to conventional parametric feedback where the cavity provides passive feedback without measurement. We show experimentally that like feedback cooling the resulting energy distribution is strongly nonthermal and can be controlled by the nonlinear damping induced by the cavity. As quadratic coupling has a prominent role in proposed protocols to generate non-Gaussian quantum states, our work represents a first step towards producing such states in a levitated system.
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Antonio Pontin, Nathanaël P. Bullier, and Peter F. Barker "Linear and quadratic optomechanical cooling of a cavity-levitated nanosphere", Proc. SPIE 11798, Optical Trapping and Optical Micromanipulation XVIII, 117980U (1 August 2021); https://doi.org/10.1117/12.2594482
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KEYWORDS
Electrodynamics
Nanoparticles
Nonlinear control
Particles
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