Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.40: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B2
Ultrafast Photon and Electron Emission Induced at Nano-Structured Gold Tips — •Benjamin Schröder1, Murat Sivis1, Matthias Duwe1, Philipp Kloth2, Martin Wenderoth2, and Claus Ropers1 — 1Materials Physics Institute and Courant Research Centre, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen — 2IV. Physikalisches Institut, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen
Surface-plasmon-polaritons (SPPs) can be resonantly excited on metallic tapers by grating-coupling [1]. In this process, SPPs propagate towards the apex of the taper and converge in a localized hot spot with small nanometric dimensions. This type of evanescent apex excitation scheme provides a unique source for scanning probe applications at greatly reduced far-field background [2]. In this contribution, we study the excitation of SPPs on structured gold tips driven by broadband titanium:sapphire laser pulses. The spectral characteristics of the light emitted from the apex are evaluated as a function of angle of incidence, and a clear resonant behaviour is identified. We also examine nonlinear photoemission from such tips [3] and demonstrate that they are compatible with atomically resolving scanning tunnelling microscopy.
[1] C. Ropers et al., Nano Lett. 7, 2784 (2007)
[2] D. Sadiq, et al., Nano Lett. 11, 1609 (2011)
[3] R. Bormann, et al., Phys. Rev. Lett. 105, 147601 (2010)