期刊
NANO LETTERS
卷 21, 期 9, 页码 3941-3946出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00625
关键词
Plasmonics; orbital angular momentum; metasurface; functional focusing; polarization
类别
资金
- Israeli Centers of Research Excellence Circle of Light
- Clore Israel Foundation
- Schmidt Science Fellowship
- Max Planck Graduate Center
- Johannes Gutenberg University Mainz
- University of Kaiserslautern
By tailoring the local and global geometries of vortex generators, arbitrary switching in the delivered plasmonic angular momentum can be achieved, providing a new method for plasmonic manipulation. The precise control over the generation and rotation direction of high-order plasmonic vortices was demonstrated, as well as the capability to create complex topological fields.
Surface plasmon polaritons carrying orbital angular momentum are of great fundamental and applied interest. However, common approaches for their generation are restricted to having a weak dependence on the properties of the plasmon-generating illumination, providing a limited degree of control over the amount of delivered orbital angular momentum. Here we experimentally show that by tailoring local and global geometries of vortex generators, a change in helicity of light imposes arbitrary large switching in the delivered plasmonic angular momentum. Using time-resolved photoemission electron microscopy we demonstrate pristine control over the generation and rotation direction of high-order plasmonic vortices. We generalize our approach to create complex topological fields and exemplify it by studying and controlling a bright vortex, exhibiting the breakdown of a high-order vortex into a mosaic of unity-order vortices while maintaining the overall angular momentum density. Our results provide tools for plasmonic manipulation and could be utilized in lab-on-a-chip devices.
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