Quadratic optomechanical cooling of a cavity-levitated nanosphere

We report on cooling of the center-of-mass motion a nanoparticle via coupling between its and optical field within high finesse cavity. The resulting is purely quadratic in displacement gives rise to van der Pol nonlinear damping. These dynamics are analogous conventional parametric feedback where cavity provides passive without an additional measurement. show experimentally that as cooling, energy distribution strongly nonthermal can be controlled by damping induced Our work represents demonstration dominated this type across all optomechanical platforms.Received 30 June 2020Accepted 16 2021DOI:https://doi.org/10.1103/PhysRevResearch.3.L032022Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasOptomechanicsPhysical SystemsNanoparticlesTechniquesChaos & dynamicsGeneral Physics