Functional meta lenses for compound plasmonic vortex field generation and control
| Autor: | Martin Aeschlimann, Michael Hartelt, Anna-Katharina Mahro, Grisha Spektor, Eva Prinz, Meir Orenstein |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Angular momentum Condensed Matter - Mesoscale and Nanoscale Physics Mechanical Engineering FOS: Physical sciences Physics::Optics Bioengineering 02 engineering and technology General Chemistry Vortex generator 021001 nanoscience & nanotechnology Condensed Matter Physics Polarization (waves) Rotation Surface plasmon polariton Helicity Vortex Computational physics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science 0210 nano-technology Plasmon Optics (physics.optics) Physics - Optics |
| Popis: | 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 circular polarization handedness 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|