Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Reiner Bormann"'
Publikováno v:
Physical Review B
Electronic pseudospin degrees of freedom in two-dimensional materials exhibit unique carrier-field interactions which allow for advanced control strategies. Here, we investigate ultrafast sublattice pseudospin relaxation in graphene by means of polar
Autor:
Till Domröse, Marcel Möller, J. Gregor Gatzmann, Stefan Rost, Thomas Danz, Nora Bach, Jakob Schauss, Claus Ropers, Murat Sivis, Reiner Bormann, Stefanie Strauch, Armin Feist, Nara Rubiano da Silva, Sascha Schäfer, Katharina E. Priebe
Publikováno v:
Ultramicroscopy
We present the development of the first ultrafast transmission electron microscope (UTEM) driven by localized photoemission from a field emitter cathode. We describe the implementation of the instrument, the photoemitter concept and the quantitative
Autor:
Sascha Schäfer, Nara Rubiano da Silva, Wenxi Liang, Claus Ropers, Reiner Bormann, Armin Feist, Katharina E. Echternkamp, Marcel Möller
Publikováno v:
International Conference on Ultrafast Phenomena.
We demonstrate the generation of low-emittance ultrashort electron pulses derived from nanoscale photocathodes and their application in ultrafast transmission electron microscopy. Few-nanometer electron focal spot diameters are achieved, enabling the
Publikováno v:
Progress in Nonlinear Nano-Optics ISBN: 9783319122168
Nonlinear photoemission from single nanostructures is investigated over a broad wavelength range in the near- and mid-infrared. The field enhancement at a nanotip apex and mid-infrared excitation enable sub-cycle dynamics, where electrons are ejected
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::39468196215ba4251fb2e442d7d93bb7
https://doi.org/10.1007/978-3-319-12217-5_10
https://doi.org/10.1007/978-3-319-12217-5_10
Autor:
Max Gulde, Claus Ropers, Reiner Bormann, Armin Feist, Simon Schweda, Sascha Schäfer, Stefanie Strauch
Publikováno v:
2014 27th International Vacuum Nanoelectronics Conference (IVNC).
Laser-driven metal needle emitters offer great potential for low emittance pulsed electron sources as required in ultrafast transmission electron microscopy. Here, we experimentally and theoretically study site-selective photoelectron emission in a f
Autor:
Daniel R. Solli, Reiner Bormann, Claus Ropers, S. V. Yalunin, Max Gulde, Katharina E. Echternkamp, Lara Wimmer, Georg Herink
Publikováno v:
SPIE Proceedings.
Photoemission from nanostructures offers sub-wavelength field localization and enhancement. Excited by ultrashort pulses, electron emission can be confined and controlled in both time and space. Studies with metallic nanotips have examined the transi
Publikováno v:
Applied Physics Letters. 107:231105
We demonstrate multiphoton photoelectron emission from gold nanotips induced by nanofocusing surface plasmons, resonantly excited on the tip shaft by a grating coupler. The tip is integrated into an electron gun assembly, which facilitates control ov
Publikováno v:
Physical review letters. 105(14)
Nonlinear photoelectron emission from metallic nanotips is explored in the strong-field regime. The passage between the multiphoton and the optical field emission regimes is clearly identified. The experimental observations are in agreement with a qu
Publikováno v:
SPIE Proceedings.
The local extraction of electrons from metal nanotips is an essential component of both scanning tunneling microscopes and transmission or scanning electron microscopes based on field emission cathodes. Laser-induced electron emission from sharp tip
Publikováno v:
International Conference on Ultrafast Phenomena.
Photoelectron emission from metallic nanotips is studied experimentally and theoretically in the strong-field regime. The passage from multiphoton to tunnel emission is clearly resolved, and explained in terms of a one-dimensional quantum mechanical