Quadratic optomechanical cooling of a cavity-levitated nanosphere
Quadratic optomechanical cooling of a cavity-levitated nanosphere
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DOI：
10.1103/physrevresearch.3.l032022
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发表时间：
2021-07-28
影响因子：
4.2
通讯作者：
Barker, P. F.
中科院分区：
文献类型：
--
作者：
Bullier, N. P.;Pontin, A.;Barker, P. F.
我们报告冷却的质心运动的纳米粒子通过其运动和光场之间的耦合在一个高精细腔。由此产生的耦合在位移上是纯二次的，并产生货车der Pol非线性阻尼。这些动力学类似于传统的参数反馈，其中腔提供无源反馈而无需额外的测量。实验结果表明，作为反馈冷却，所产生的能量分布是强烈的非热，可以控制的非线性阻尼诱导的腔。我们的工作是一个示范的腔冷却主导的这种类型的耦合在所有的光机平台。
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.