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Proceedings Paper

Brownian dynamics of the optically trapped spinning microparticles in low pressures
Author(s): Mengjiao Lang; Wei Xiong; Guangzong Xiao; Xiang Han; Jianxun Tang
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Paper Abstract

Optical trap has become a powerful tool of biology and physics, since it has some useful functions such as optical rotator, optical spanner and optical binding. We present the translational motions in the transverse plane of a 4.4μm-diameter vaterite particle which is optically trapped in low pressures utilizing the Monte-Carlo method. We find that the air pressure around the microparticle plays an important part in the determination of dynamics of the trapped particle. According to the energy equipartition theorem, the position fluctuations of the optically trapped particle satisfy Maxwell-Bolzmann distributions. We present the features of particles’ displacements and velocities changing with air pressures in detail, and find that the modulation of the trap stiffness makes a higher position variance. The mechanical quality factor Q larger than 10 induces a high peak of power spectral density. Our research presents a powerful tool towards further discovery of dynamical characteristics of optically trapped Brownian particles in low air pressures.

Paper Details

Date Published: 25 October 2017
PDF: 8 pages
Proc. SPIE 10460, AOPC 2017: Optoelectronics and Micro/Nano-Optics, 1046010 (25 October 2017); doi: 10.1117/12.2284450
Show Author Affiliations
Mengjiao Lang, National Univ. of Defense Technology (China)
Wei Xiong, National Univ. of Defense Technology (China)
Guangzong Xiao, National Univ. of Defense Technology (China)
State Key Lab. of Transient Optics and Photonics (China)
Xiang Han, National Univ. of Defense Technology (China)
Jianxun Tang, National Univ. of Defense Technology (China)

Published in SPIE Proceedings Vol. 10460:
AOPC 2017: Optoelectronics and Micro/Nano-Optics
Min Qiu; Min Gu; Xiaocong Yuan; Zhiping Zhou, Editor(s)

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