Nonlinear Dynamics and Strong Cavity Cooling of Levitated Nanoparticles
Nonlinear Dynamics and Strong Cavity Cooling of Levitated Nanoparticles
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DOI：
10.1103/physrevlett.117.173602
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发表时间：
2016-10-21
影响因子：
8.6
通讯作者：
Barker, P. F.
中科院分区：
文献类型：
--
作者：
Fonseca, P. Z. G.;Aranas, E. B.;Barker, P. F.
光机械系统探索并利用光与宏观物质的机械运动之间的耦合。非线性耦合在量子和经典领域都提供了丰富的新物理现象。我们研究一种动态的（与通常研究的静态情况相反）非线性光机械系统，它由一个悬浮在混合电光阱中的纳米球组成。该腔能够读出与位置呈线性和与位置呈二次方（非线性）的光与物质的耦合，同时在高真空下对纳米球进行无限时长的冷却。我们通过线性和非线性耦合观察冷却动力学。随着背景气体压力降低，在当前装置中温度降至读出灵敏度以下之前，我们观察到温度降低了1000多倍。这篇快报为腔与一个很大程度上与其环境解耦的纳米粒子之间的强耦合量子动力学开辟了道路。
Optomechanical systems explore and exploit the coupling between light and the mechanical motion of macroscopic matter. A nonlinear coupling offers rich new physics, in both quantum and classical regimes. We investigate a dynamic, as opposed to the usually studied static, nonlinear optomechanical system, comprising a nanosphere levitated in a hybrid electro-optical trap. The cavity offers readout of both linear-in-position and quadratic-in-position (nonlinear) light-matter coupling, while simultaneously cooling the nanosphere, for indefinite periods of time and in high vacuum. We observe the cooling dynamics via both linear and nonlinear coupling. As the background gas pressure was lowered, we observed a greater than 1000-fold reduction in temperature before temperatures fell below readout sensitivity in the present setup. This Letter opens the way to strongly coupled quantum dynamics between a cavity and a nanoparticle largely decoupled from its environment.