Optically Levitated Nanodumbbell Torsion Balance and GHz Nanomechanical Rotor.

  title={Optically Levitated Nanodumbbell Torsion Balance and GHz Nanomechanical Rotor.},
  author={Jonghoon Ahn and Zhujing Xu and Jaehoon Bang and Yu-Hao Deng and Thai M. Hoang and Qinkai Han and Ren‐Min Ma and Tongcang Li},
  journal={Physical review letters},
  volume={121 3},
Levitated optomechanics has great potential in precision measurements, thermodynamics, macroscopic quantum mechanics, and quantum sensing. Here we synthesize and optically levitate silica nanodumbbells in high vacuum. With a linearly polarized laser, we observe the torsional vibration of an optically levitated nanodumbbell. This levitated nanodumbbell torsion balance is a novel analog of the Cavendish torsion balance, and provides rare opportunities to observe the Casimir torque and probe the… 

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