Affiliation:
1. Shenzhen University
2. Research Institute of Intelligent Sensing
Abstract
Due to the sub-diffraction-limited size and giant field enhancement, plasmonic tweezers have a natural advantage in trapping metallic particles. However, the strict excitation condition makes it difficult to generate an arbitrary plasmonic field in a controllable manner, thus narrowing its practical applications. Here, we propose an all-optical plasmonic field shaping method based on a digital holographic algorithm and generate plasmonic vortex arrays with controllable spot numbers, spatial location, and topological charge. Our experimental results demonstrate that multiple gold particles can be stably trapped and synchronously rotated in the vortex arrays, and the particles’ kinestate can be dynamically switched. The proposed holographic plasmonic vortex tweezers are suitable for a broadband particle trapping, and this method can be generalized to other surface electromagnetic waves like Bloch surface wave.
Funder
National Natural Science Foundation of China
Shenzhen Science and Technology Program
Guangdong Major Project of Basic and Applied Basic Research
China Postdoctoral Science Foundation
Subject
Atomic and Molecular Physics, and Optics