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An optically levitated nonspherical particle in a vacuum is great for torque sensing and rotational quantum mechanics. Recently, we optically levitated silica nanodumbbells in a vacuum and drove them to rotate beyond 5 GHz. With an optically levitated nanorotor, we demonstrated a torque sensor with a record-high sensitivity [Nature Nanotechnology, 15, 89 (2020)]. Such an ultrasensitive torque sensor will have the potential to detect the long-sought quantum vacuum friction. We also demonstrated 5D cooling and observed nonlinear dynamics of an optically levitated nanodumbbell in a vacuum. This work is an important step towards full quantum control of the rigid-body motion of a levitated nonspherical particle.
Tongcang Li
"5D cooling and torque detection with optically levitated nanoparticles", Proc. SPIE 11798, Optical Trapping and Optical Micromanipulation XVIII, 1179816 (1 August 2021); https://doi.org/10.1117/12.2595487
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Tongcang Li, "5D cooling and torque detection with optically levitated nanoparticles," Proc. SPIE 11798, Optical Trapping and Optical Micromanipulation XVIII, 1179816 (1 August 2021); https://doi.org/10.1117/12.2595487