Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: Plasmonics and Nanophotonics II (Joint Session O/DS/HL)
O 32.3: Vortrag
Dienstag, 23. März 2010, 15:30–15:45, H2
Third-Harmonic Generation Spectroscopy in Hybrid Plasmonic Systems — •Tobias Utikal1,2, Thomas Zentgraf3, Markus Lippitz1,2, and Harald Giessen1 — 14. Physikalisches Institut, Universität Stuttgart — 2Max-Planck-Institut für Festkörperforschung, Stuttgart — 3NFS Nano-Scale Science and Engineering Center, University of California, Berkeley, USA
In this work we perform third-harmonic generation (THG) spectroscopy in metallic photonic crystals consisting of gold nanowires buried in a dielectric slab waveguide. In these structures particle plasmon polaritons, which are optically excited in the wires, can be hybridized with photonic waveguide modes, which are excited due to the periodic arrangement of the wires. By tailoring the structure geometry the spectrally broad particle plasmon resonance can exhibit an ultra-narrow and pronounced extinction dip. We excite this hybrid plasmonic system with 150 fs laser pulses which can be spectrally tuned over the modulated plasmonic resonance and measure the generated third-harmonic light. The experiments show that it is insufficient to deduce the shape of the THG spectrum from the linear extinction. It is rather essential to consider the full information of the linear response, i.e. amplitude and phase. We find indications that the increased group index and the associated slow light around the extinction dip leads to an increase in the THG signal.