Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 11: Ultrafast and Nonlinear Plasmonics
O 11.8: Vortrag
Montag, 16. März 2015, 16:45–17:00, MA 004
Second-harmonic generation with double resonant hybrid plasmonic/dielectric antennas — •Heiko Linnenbank1, Yevgen Grynko2, Jens Förstner2, and Stefan Linden1 — 1Physikalisches Institut, Universität Bonn, Germany — 2Institut für Elektrotechnik und Informationstechnik, Universität Paderborn, Germany
In several studies it has been shown that the excitation of plasmonic resonances in gold nanostructures with ultrashort light pulses can give rise to large second and third harmonic signals. Here, we demonstrate that the second harmonic generation efficiency of metallic nanostructures can be increased by depositing a dielectric material with a large second order nonlinear coefficient in the hot spots of the structures. By varying the geometry of the nanostructures and by performing nonlinear spectroscopy we rule out that the enhancement of the second harmonic signal is due to a trivial shift of the plasmonic resonance frequency caused by the incorporation of the dielectric material. Furthermore, we have performed nonlinear experiments with double-resonant metallic nanostructures that exhibit plasmonic resonances at both the frequency of the pump light and the generated second harmonic light. Compared to metallic nanostructures which are only resonant to the pump light, the double-resonant structures give rise to larger second harmonic signals. Moreover, they also allow to control the polarisation properties of the generated light.