Orbital Rotation of Nematic Liquid Crystal Microsphere Manipulated by Optical Vortex Tweezers
Chun Chuang1, Yu-Chou Chuang1*, Jia-De Lin1, Chia-Yi Huang2, Ting-Shan Mo3, Chia-Rong Lee1
1Department of Photonics and Advanced Optoelectronics Technology Center, National Cheng Kung University, Tainan, Taiwan
2Department of Applied Physics, Tunghai University, Taichung, Taiwan
3Department of Electronic Engineering, Kun Shan University of Technology, Tainan, Taiwan
* presenting author:Yu Chou Chuang, email:joes860220@gmail.com
This study demonstrates the rotation behaviors of the nematic liquid crystal (NLC) microspheres (MSs) under the incident light field of optical vortex tweezers. The orbital motions of the NLC MSs manipulated by the optical tweezers were investigated under various experimental conditions, such as the inner structure of the NLC MS, the diameter of the MS, the power and the value of the orbital angular momentum, l (l = 6, 8, 10, 12) of the incident vortex beam. Experimental results are qualitatively analyzed and showed that the orbital motion of the NLC MSs depends on the sizes of the MSs, the l value of the incident vortex beam, and the internal LC structure of the MSs.

Keywords: liquid crystal microsphere, optical vortex, optical tweezers