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Highlights

New Science Advances Article

12.07.2017

Symbolic image of the experimentally measured snapshots at different times for short-range surface plasmons (excited with light at 800 nm wavelength, the electron waves on a single crystalline, atomically flat gold surface), the nanofocus in the center which is created, and the electrons ejected by the nanofocus.
Schematic image of the nanofocusing of short-range surface plasmons in the center of concentric ring apertures.
Experimental setup: Plasmon excitation and imaging are realized via two photon photoemission microscopy (2PPE PEEM) at normal incidence. The plasmon excitation wavelength is 800 nm. Electrons are emitted from the plasmon wave and imaged with nanometer resolution using electron optics.
PEEM image of a 22 nm thick single crystalline gold platelet, patterned with a circular grating of 150 nm period via focused ion beam milling. The diameter of the central disk is 2 µm. The short-range plasmon couples into the disk, waves collide at the center, forming an oscillating 60x120 nm² electron hot spot, from which the electrons are emitted.

Our new Science Advances article Short-range Surface Plasmonics: Localized Electron Emission Dynamics from a 60 nm Spot on Atomically Flat Single Crystalline Gold by Bettina Frank, Philip Kahl, Daniel Podbiel, Grisha Spektor, Meir Orenstein, Liwei Fu, Thomas Weiss, Michael Horn-von Hoegen, Tim J. Davis, Frank-Joachim Meyer zu Heringdorf, and Harald Giessen has now been published.

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Preis der Freunde

03.07.2017

Our former PhD student Dr. Tobias Steinle received the "Preis der Freunde der Universität Stuttgart" (5000 EUR) for the best PhD thesis in 2016 from Bosch CEO Dr. Volkmar Denner, who is also an alumnus of the Department of Physics of Stuttgart University. Congratulations!

New Science Article

17.03.2017

Symbolic image of light interacting with a gold surface with 4-fold symmetric Archimedean spirals: Plasmons with orbital angular momentum are excited and swirl towards the center. © University of Stuttgart, Image by Sven Hein.
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. © 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. © 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. © 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. © University of Duisburg-Essen, Image taken by Frank Meyer zu Heringdorf, Philip Kahl, and Daniel Podbiel.

Experimental electron microscopy images of short-range surface plasmons with orbital angular momentum l=4. © University of Duisburg-Essen. Image taken by Frank Meyer zu Heringdorf, Philip Kahl, and Daniel Podbiel.

Our new Science article Revealing the subfemtosecond dynamics of orbital angular momentum in nanoplasmonic vortices by Grisha Spektor, Deirdre Kilbane, Anna-Katharina Mahro, Bettina Frank, Simon Ristok, Lior Gal, Philip Kahl, Daniel Podbiel, Stefan Mathias, Harald Giessen, Frank-Joachim Meyer zu Heringdorf, Meir Orenstein, and Martin Aeschlimann has now been published.

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New Science Advances Article

15.02.2017

 Working principle of foveated imaging: Four lenses with different focal lengths image the object. The information is later combined digitally.
3D printing process directly onto the CMOS chip.
CMOS sensor with different lenses in groups of four.
Scanning electron microscope image of a section through a micro-objective lens.
Comparison of imaging performance for the foveated (left) and the non-foveated case (right).

Our new Science Advances article 3D-printed eagle eye: Compound microlens system for foveated imaging by Simon Thiele, Kathrin Arzenbacher, Timo Gissibl, Harald Giessen, and Alois Herkommer has now been published.

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AvH Fellowship

20.12.2016

Our former PhD student and postdoc Dr. Bernd Metzger (JILA, Boulder, University of Colorado) received an AvH fellowship for carrying out research in the group of Prof. Markus Raschke at the University of Colorado, USA. Congratulations!