Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 11: Ultrafast and Nonlinear Plasmonics

O 11.9: Vortrag

Montag, 16. März 2015, 17:00–17:15, MA 004

Second harmonic generation with two-photon resonant plasmonic metamaterials — •Heiko Linnenbank and Stefan Linden — Physikalisches Institut, Universität Bonn, Germany

Second harmonic generation from lithographically defined metallic nanostructures has been a topic of large interest in recent years. In order to take advantage of local field enhancement effects, the samples are typically designed such that one of the plasmonic modes of the respective metallic nanostructure is resonant to the incident pump wave. In contrast, the second harmonic signal usually is not resonant to one of the higher order plasmonic modes. Here we show that also the opposite scheme can be employed for enhanced second harmonic generation. For this purpose, we have performed nonlinear spectroscopic experiments with different metallic nanostructures where rather the second harmonic light drives a plasmonic resonance than the pump field. Our findings can be explained in the framework of the anharmonic oscillator model where the characteristic parameters are extracted from linear extinction measurements.