光学镊子
旋涡
光学力
角动量
光学
拓扑量子数
半径
物理
几何相位
旋转(数学)
涡流
相(物质)
凝聚态物理
经典力学
量子力学
热力学
计算机科学
计算机安全
数学
几何学
作者
Zhe Shen,Zhiyuan Xiang,Ziyao Wang,Yaochun Shen,Baifu Zhang
出处
期刊:Applied Optics
[The Optical Society]
日期:2021-05-27
卷期号:60 (16): 4820-4820
被引量:19
摘要
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.
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