Concentric ring optical traps for orbital rotation of particles
Author:
Li Xing12ORCID, Dan Dan12, Yu Xianghua12, Zhou Yuan12, Zhang Yanan12, Gao Wenyu12, Li Manman1ORCID, Xu Xiaohao1, Yan Shaohui12, Yao Baoli123
Affiliation:
1. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences , Xi’an 710119 , China 2. University of Chinese Academy of Sciences , Beijing 101408 , China 3. Collaborative Innovation Center of Extreme Optics, Shanxi University , Taiyuan 030006 , China
Abstract
Abstract
Optical vortices (OVs), as eigenmodes of optical orbital angular momentum, have been widely used in particle micro-manipulation. Recently, perfect optical vortices (POVs), a subclass of OVs, are gaining increasing interest and becoming an indispensable tool in optical trapping due to their unique property of topological charge-independent vortex radius. Here, we expand the concept of POVs by proposing concentric ring optical traps (CROTs) and apply them to trapping and rotating particles. A CROT consists of a series of concentric rings, each being a vortex whose radius and topological charge can be controlled independently with respect to the other rings. Quantitative results show that the generated CROTs have weak sidelobes, good uniformity, and relatively high diffraction efficiency. In experiments, CROTs are observed to trap multiple dielectric particles simultaneously on different rings and rotate these particles with the direction and speed of rotation depending on the topological charge sign and value of each individual ring. In addition, gold particles are observed to be trapped and rotate in the dark region between two bright rings. As a novel tool, CROTs may find potential applications in fields like optical manipulation and microfluidic viscosity measurements.
Funder
Key Research Program of Frontier Sciences, CAS National Natural Science Foundation of China
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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