Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 52: Photonics and Nanooptics II: Nonlinear Response

O 52.9: Talk

Wednesday, March 9, 2016, 12:30–12:45, S051

An ultrafast nanotip electron gun triggered by grating-coupled surface plasmons — •Benjamin Schröder, Murat Sivis, Reiner Bormann, Sascha Schäfer, and Claus Ropers — 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

We present recent results on the photoelectron emission from metal nanotips induced by propagating surface plasmon polaritons (SPPs) excited in a grating-coupler on the tip shaft [1-3]. Nanofocusing of the SPPs induces multiphoton photoemission with high efficiency. The nanostructure is inserted in a modified field-emitter electron gun geometry controlling the electrostatic environment of the tip. In this way, a site-selective control of the electron emission is achieved, and we can disentangle electrons emitted from the apex from those originating at the grating or shaft. Both the control of the transverse beam properties and the local extraction fields enabled by the gun design will be beneficial in future ultrafast transmission electron microscope applications [4].

[1] C. Ropers, C.C. Neacsu, T. Elsaesser, M. Albrecht, M.B. Raschke, and C. Lienau, Nano Lett. 7, 2784 (2007).

[2] S. Berweger, J.M. Atkin, X.G. Xu, R.L. Olmon, and M.B. Raschke, Nano Lett. 11, 4309 (2011).

[3] J. Vogelsang, J. Robin, B.J. Nagy, P. Dombi, D. Rosenkranz, M. Schiek, P. Groß, and C. Lienau, Nano Lett. 15, 4685 (2015).

[4] B. Schröder, M. Sivis, R. Bormann, S. Schäfer, and C. Ropers, accepted for puplication in Appl. Phys. Lett. (2015).