Opto propeller effect on Micro-Rotors with different handedness

doi:10.1088/1674-1056/28/8/084702

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.

Keywords: micro-rotors with different handedness propeller effect dielectric loss

Received: 22 April 2019
Revised: 06 June 2019
Accepted manuscript online:

PACS:	47.61.Fg	(Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS))
	47.10.ad	(Navier-Stokes equations)
	77.22.Gm	(Dielectric loss and relaxation)
	05.10.Gg	(Stochastic analysis methods)

Fund: 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).

Corresponding Authors: Zhibing Li
E-mail: stslzb@mail.sysu.edu.cn

Cite this article:

Yiwen Tang(唐怡闻), Zhibing Li(李志兵) Opto propeller effect on Micro-Rotors with different handedness 2019 Chin. Phys. B 28 084702

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