Investigation of rotation characteristics of optically levitated particles

被引：0
|
作者：
Zeng K. [1 ]
Pu J. [1 ]
Wu Y. [1 ]
Xiao D. [1 ]
Wu X. [1 ]
机构：
[1] College of Intelligence Science and Technology, National University of Defense Technology, Changsha
来源：
Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2023年 / 53卷 / 08期
关键词：
levitated optomechanical systems; optically induced rotation; stability of rotation; ultra-fast rotation;
D O I：
10.1360/SST-2023-0080
中图分类号：
学科分类号：
摘要：
A levitated optomechanical system levitates particles in the air or vacuum, which insulates the environment noise well and plays an important role in many fields related to precision measurement and quantum science. This system uses a circularly polarized laser to drive particles to spin, which can carry out research on torque measurement, gas identification, and vacuum friction. This paper describes a vacuum optical levitation and rotation experimental device based on the rotating dynamics model of optically levitated particles. The average speed and fluctuation of the rotational speed of levitated particles are studied. The results show that the stronger the laser power that affects the optical torque and the closer the laser polarization is to the circularly polarized light, the greater the average rotational speed of particles. However, the main factor that affects the average rotational speed of particles is the damping torque. The average rotational speed can be increased by reducing the ambient pressure to reduce the rotational damping of particles. When the pressure decreases to 0.1 Pa, we drive the spherical vaterite microsphere with a diameter of 4 μm at a speed of 3.93 MHz. Simultaneously, in a low-damping environment, the thermal motion of particles also becomes obvious, resulting in a change in the equivalent laser power of levitated particles with the thermal motion. Subsequently, the rotational speed fluctuation also increases with pressure decrease. This paper, for the first time, investigated the rotational frequency fluctuation under unchanged pressure and varying mean rotational frequency. These conditions further illustrate the effect of thermal motion on rotational frequency. Besides, the relative fluctuation of rotation with changing pressure is investigated, and the results allow for the potential application of optically levitated rotors in the field of gyroscopes. These results are of great significance for improving the existing applications of optical levitation systems and opening new fields. © 2023 Chinese Academy of Sciences. All rights reserved.
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页码：1351 / 1359
页数：8
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