Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics I

Q 31.84: Poster

Tuesday, March 7, 2017, 17:00–19:00, P OG1+2

Study of electron photoemission from a tungsten nanotip triggered by ultrashort laser pulses with photon energies from UV to mid-IR — •Ang Li, Martin Kozak, Joshua McNeur, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen

Electron photoemission from metallic nanotips is employed in various applications that require high brightness bunched electron beams. Such applications include ultrafast electron microscopy and diffraction [1] as well as the operation of dielectric laser accelerators [2]. The latter is based on micron-scale dielectric nanostructures driven by the high peak field of short laser pulses and has been experimentally demonstrated [3,4]. This acceleration technique requires excellent electron beam quality in order to obtain an efficient acceleration without high losses of electron current. In this contribution we report on a recent experimental study of electron photoemission from tungsten nanotips triggered by the ultrashort laser pulses with photon energies ranging from UV to mid-IR. Further, the observation of transition between single- and multiphoton photoemission is discussed along with the regime of light-induced tunneling process. We focus on the role of Coulomb repulsion in the regime of more than one emitted electron per laser pulse.

[1] A. H. Zewail et al., 4D Electron Microscopy: Imaging in Space and Time (Imperial College Press, London, 2010).

[2] J. England et al., Rev. Mod. Phys. 86, 1337 (2014).

[3] J. Breuer et al, Phys. Rev. Lett. 111, 134803 (2013).

[4] E. A. Peralta et al., Nature 503, 91-94 (2013).