Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 11: Ultrafast and Nonlinear Plasmonics
O 11.11: Talk
Monday, March 16, 2015, 17:30–17:45, MA 004
Applying the Otto geometry to observe second-harmonic generation from a surface plasmon resonance — •Karsten Pufahl1, Jan Heckmann1, Nicolai B. Grosse1, Liuyang Sun2, John Sipe3, Xiaoqin Li2, and Ulrike Woggon1 — 1Institut für Optik und Atomare Physik, Technische Universität Berlin, Germany — 2Department of Physics, University of Texas-Austin, USA — 3Department of Physics, University of Toronoto, Canada
The Otto geometry enables the probing of material surfaces using evanescent fields having well-defined k-vectors. We have demonstrated this technique in the nonlinear optical regime to investigate how the excitation of a surface-plasmon (SP) resonance leads to enhanced second-harmonic generation (SHG) from a silver surface. The analysis of SHG in k-space allows one to infer SP propagation length and the enhancement of the near-field, while being free to vary the air gap which sets the SP-to-photon coupling strength. In contrast to the Kretschmann geometry where one is limited to investigating thin films at a fixed coupling strength, the Otto technique has the additional advantage that surface wave phenomena can also be explored in bulk and opaque samples.