中国物理B ›› 2019, Vol. 28 ›› Issue (8): 84702-084702.doi: 10.1088/1674-1056/28/8/084702

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Opto propeller effect on Micro-Rotors with different handedness

Yiwen Tang(唐怡闻), Zhibing Li(李志兵)   

  1. School of Physics, Sun Yat-sen University, Guangzhou 510275, China
  • 收稿日期:2019-04-22 修回日期:2019-06-06 出版日期:2019-08-05 发布日期:2019-08-05
  • 通讯作者: Zhibing Li E-mail:stslzb@mail.sysu.edu.cn
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2013CB933601), the National Key Research and Development Project of China (Grant No. 2016YFA0202001), and the Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (the second phase).

Opto propeller effect on Micro-Rotors with different handedness

Yiwen Tang(唐怡闻), Zhibing Li(李志兵)   

  1. School of Physics, Sun Yat-sen University, Guangzhou 510275, China
  • Received:2019-04-22 Revised:2019-06-06 Online:2019-08-05 Published:2019-08-05
  • Contact: Zhibing Li E-mail:stslzb@mail.sysu.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2013CB933601), the National Key Research and Development Project of China (Grant No. 2016YFA0202001), and the Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (the second phase).

摘要: Manipulating biomacromolecules and micro-devices with light is highly appealing. Opto driving torque can propel micro-rotors to translational motion in viscous liquid, and then separate microsystems according to their handedness. We study the torque of dielectric loss generated by circular polarized lasers. The unwanted axial force which causes the handedness independent translational motion is cancelled by the counter propagating reflection beams. The propelling efficiency and the friction torque of water are obtained by solving the Navier-Stokes equation. In the interesting range of parameters, the numerical friction torque is found to be linear to the angular velocity with a slope depending on the radius of rotor as r3. The time-dependent distribution of angular velocity is obtained as a solution of the Fokker-Planck equation, with which the thermal fluctuation is accounted. The results shed light on the micro-torque measurement and suggest a controllable micro-carrier.

关键词: micro-rotors with different handedness, propeller effect, dielectric loss

Abstract: Manipulating biomacromolecules and micro-devices with light is highly appealing. Opto driving torque can propel micro-rotors to translational motion in viscous liquid, and then separate microsystems according to their handedness. We study the torque of dielectric loss generated by circular polarized lasers. The unwanted axial force which causes the handedness independent translational motion is cancelled by the counter propagating reflection beams. The propelling efficiency and the friction torque of water are obtained by solving the Navier-Stokes equation. In the interesting range of parameters, the numerical friction torque is found to be linear to the angular velocity with a slope depending on the radius of rotor as r3. The time-dependent distribution of angular velocity is obtained as a solution of the Fokker-Planck equation, with which the thermal fluctuation is accounted. The results shed light on the micro-torque measurement and suggest a controllable micro-carrier.

Key words: micro-rotors with different handedness, propeller effect, dielectric loss

中图分类号:  (Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS))

  • 47.61.Fg
47.10.ad (Navier-Stokes equations) 77.22.Gm (Dielectric loss and relaxation) 05.10.Gg (Stochastic analysis methods)