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HL: Halbleiterphysik
HL 49: Photonische Kristalle II
HL 49.1: Talk
Tuesday, March 8, 2005, 10:45–11:00, TU P164
Nonlinear optical experiments on waveguide plasmon polaritons using 5fs pulses — •Matthias W. Klein1, Thorsten Tritschler1, Stefan Linden2, and Martin Wegener1 — 1Institut für Angewandte Physik, Universität Karlsruhe (TH), Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany — 2Institut für Nanotechnologie, Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, 76021 Karlsruhe, Germany
We present improved experiments and theoretical modeling of the linear and third-harmonic (TH) optical response of particle plasmons coupled resonantly to a slab waveguide. Our samples consist of lithographically patterned gold stripes on top of a HfO2 waveguide. This system shows an avoided crossing in linear optics [1] and first nonlinear experiments have been presented [2]. In our experiment we use 5fs pulses from a Ti:Sa oscillator and resolve the TH signal both temporally and spectrally. The TH signal exhibits a pronounced beating versus time delay for specific spectral components, an exponential decay for other components, and shows evidence of partial destructive interference. The data fit very well to our theoretical model based on two coupled Lorentz oscillators, which also explains Fano-like lineshapes in the linear spectra. Moreover, we analytically show that the determination of the homogeneous linewidth of particle plasmon ensembles via second or third-harmonic generation experiments is not possible, thus contradicting Ref. [3].
[1] A. Christ et al., Phys. Rev. Lett. 91, 183901 (2003)
[2] T. Zentgraf, A. Christ, J. Kuhl, and H. Giessen, submitted (2004)
[3] B. Lamprecht et al., Appl. Phys. B 69, 223 (1999)