Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 52: Focussed session: Coherence and coherent control in nanophotonics and plasmonics II
O 52.4: Talk
Wednesday, March 28, 2012, 18:15–18:30, MA 005
Control of second-harmonic generation in metal nanoparticles and nanowires — •Giovanni Piredda1, Zhimin Shi2, Nina Rauhut1, Regina de Vivie-Riedle1, and Achim Hartschuh1 — 1Physikalische Chemie, Department Chemie, Ludwig-Maximilians-Universität München — 2The Institute of Optics, University of Rochester, Rochester, NY 14620, USA
The goal of ultrafast nanooptics is shaping the electric field at the nanometer spatial scale and the femtosecond temporal scale through the controlled excitation of optical resonances in metallic nanostructures [1]. Experiments on nanoparticles and nanowires allow one to consider in a separate way two different types of resonances: localized resonances that are based on dipolar response and Fabry-Perot resonances that are based on propagation effects. Accordingly, we excite nanoparticles with chirped femtosecond pulses, and nanowires with pulse trains; we observe second-harmonic generation from the metal structures [2] as a function of pulse parameters in the two cases and demonstrate that the coherent control of harmonic generation reflects the characteristics of the resonance.
[1] M.I. Stockman, S.V. Faleev, and D.J. Bergman; Coherent control of femtosecond energy localization in nanosystems; Phys. Rev. Lett., 88, 067402 (2002).
[2] M. Zavelani-Rossi et al.; Near-field second-harmonic generation in single gold nanoparticles; Appl. Phys. Lett., 92, 093119 (2008).