Press articles:
- IEEE Spectrum article: Combining Twisted Light and Plasmons Could Supercharge Data Storage
- Welt der Physik article (in German): Superzeitlupe für Plasmonenwirbel
- pro-physik.de article (in German): Lichtstrudel im Attosekundentakt
- nanotechweb.org article Plasmonic subfemtosecond dynamics whirl into view
- PHOTONIK article (in German): Lichtstrudel in Metallen beobachtet
- Ars Technica article: Putting light in a spin generates a ring of fire on gold film
Symbolic image of the time-resolved dynamics of plasmons with orbital angular momentum: The interaction of light is indicated, and the individual snapshots at different times indicate the plasmons with orbital angular momentum. The 4-fold vortex in the center is swirling around. The black and white images are actual data from the electron imaging experiments.
Image: University of Stuttgart, Image by Florian Sterl and Nikolai Strohfeldt.
Experimental setup: a femtosecond laser pulse impinges onto a single crystalline, atomically flat gold sample, where a nanostructure has been cut into by ion-beam milling. Plasmons are excited. At high plasmon intensities, electrons are liberated, which are then imaged in an electron microscope. By sending in two laser pulses with a certain time delay and recording the electron microscopy images, entire movies can be composed of those snapshots, revealing the femtosecond dynamics of the plasmons with orbital angular momentum.
Image: University of Duisburg-Essen.
Electron microscopy images of long-range surface plasmons in a sample with orbital angular momentum of l=10. Upper row: Experiments. Bottom row: Simulations.
Image: University of Kaiserslautern and Technion, Haifa, Experimental image taken by Deirdre Kilbane. Theoretical simulation by Grisha Spektor.
Experimental electron microscopy images of short-range surface plasmons with orbital angular momentum l=4.
Image: University of Duisburg-Essen, Image taken by Frank Meyer zu Heringdorf, Philip Kahl, and Daniel Podbiel.
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