Revealing the subfemtosecond dynamics of orbital angular momentum in nanoplasmonic vortices
2017 | journal article. A publication with affiliation to the University of Göttingen.
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Revealing the subfemtosecond dynamics of orbital angular momentum in nanoplasmonic vortices
Spektor, G.; Kilbane, D.; Mahro, A. K.; Frank, B.; Ristok, S.; Gal, L. & Kahl, P. et al. (2017)
Science, 355(6330) pp. 1187-1191. DOI: https://doi.org/10.1126/science.aaj1699
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Details
- Authors
- Spektor, G.; Kilbane, D.; Mahro, A. K.; Frank, B.; Ristok, S.; Gal, L.; Kahl, P.; Podbiel, D.; Mathias, Stefan ; Giessen, H.; zu Heringdorf, F. -J. Meyer; Orenstein, M.; Aeschlimann, M.
- Abstract
- The ability of light to carry and deliver orbital angular momentum (OAM) in the form of optical vortices has attracted much interest. The physical properties of light with a helical wavefront can be confined onto two-dimensional surfaces with subwavelength dimensions in the form of plasmonic vortices, opening avenues for thus far unknown light-matter interactions. Because of their extreme rotational velocity, the ultrafast dynamics of such vortices remained unexplored. Here we show the detailed spatiotemporal evolution of nanovortices using time-resolved two-photon photoemission electron microscopy. We observe both long- and short-range plasmonic vortices confined to deep subwavelength dimensions on the scale of 100 nanometers with nanometer spatial resolution and subfemtosecond time-step resolution. Finally, by measuring the angular velocity of the vortex, we directly extract the OAM magnitude of light.
- Issue Date
- 2017
- Status
- published
- Publisher
- Amer Assoc Advancement Science
- Journal
- Science
- ISSN
- 1095-9203; 0036-8075