Shen, Zhe, Xiang, Zhiyuan, Wang, Ziyao, Shen, Yaochun 
ORCID: 0000-0002-8915-1993 and Zhang, Baifu
(2021)
Optical spanner for nanoparticle rotation with focused optical vortex generated through a Pancharatnam-Berry phase metalens.
APPLIED OPTICS, 60 (16).
pp. 4820-4826.
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Abstract
Based on the focused optical vortex (OV) generated by a metalens, we studied the physical mechanism for optical manipulation of metal (Ag) nanoparticles in the orbital angular momentum (OAM) field. We found that metal nanoparticles can be stably trapped inside the OV ring and rotated by the azimuthal driving force originating from OAM transfer. The azimuthal force and rotation speed are directly and inversely proportional to the particle size, respectively. The torque for the same particle at the OV ring increases with the increase of the topological charge of the metalens. Considering the same topological charge, the radius of the OV ring or the range of the optical spanner has a positive correlation with the focal length. These kinds of optical tweezers by vortex metalenses can be used as an optical spanner or micro-rotor for lab-on-chip applications.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Bioengineering, Nanotechnology |
| Divisions: | Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 27 May 2021 07:54 |
| Last Modified: | 26 Apr 2024 06:17 |
| DOI: | 10.1364/AO.425892 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3124162 |
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