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.Received 30 June 2020Accepted 16 June 2021DOI:https://doi.org/10.1103/PhysRevResearch.3.L032022Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasOptomechanicsPhysical SystemsNanoparticlesTechniquesChaos & nonlinear dynamicsGeneral Physics
Highlights
The field of cavity optomechanics has made significant progress over the last decade by controlling and tailoring the interaction between an optical field and a mechanical oscillator
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
Our work represents a demonstration of a cavity cooling dominated by this type of coupling across all optomechanical platforms
Summary
The field of cavity optomechanics has made significant progress over the last decade by controlling and tailoring the interaction between an optical field and a mechanical oscillator. 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. As for the membrane-in-the-middle setup, control over the oscillator mean position within the cavity standing wave enables an optical coupling that is linear or quadratic in the particle motion [25,26,27].
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