Coupling between mesoscopic particles levitated in vacuum is a prerequisite for the realization of a large-scale array of particles in an underdamped environment as well as potential studies at the classical–quantum interface. Here, we demonstrate for the first time, to the best of our knowledge, optical binding between two rotating microparticles mediated by light scattering in vacuum. We investigate autocorrelations between the two normal modes of oscillation determined by the center-of-mass and the relative positions of the two-particle system. The inter-particle coupling, as a consequence of optical binding, removes the degeneracy of the normal mode frequencies, which is in good agreement with theory. We further demonstrate that the optically bound array of rotating microparticles retains their optical coupling during gyroscopic cooling, and exhibits cooperative motion whose center-of-mass is stabilized.

中文翻译：

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在真空中悬浮的两个冷却的微型陀螺仪的光学结合

真空中悬浮的介观粒子之间的耦合是在欠阻尼环境中实现大规模粒子阵列以及在经典-量子界面上进行潜在研究的前提。在此，据我们所知，我们首次展示了由真空中的光散射介导的两个旋转微粒之间的光学结合。我们研究由质心和两个粒子系统的相对位置确定的两个正常振荡模式之间的自相关。由于光学结合，粒子间的耦合消除了正常模频率的简并性，这与理论非常吻合。我们进一步证明了旋转微粒的光学结合阵列在陀螺仪冷却过程中保留了它们的光学耦合，