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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.22: Poster
Dienstag, 1. April 2014, 18:30–22:00, P2
Third Harmonic Spectroscopy of Polymer-Nanoantenna Hybrid Systems — •Gelon Albrecht1,2, Bernd Metzger1, Sybille Allard3, Ullrich Scherf3, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, Stuttgart 70569, Germany — 2Max Planck Institute for Solid State Research, Heisenbergstraße 1, Stuttgart 70569, Germany — 3Bergische Universität Wuppertal, Gaußstraße 20, Wuppertal 42119, Germany
Nonlinear plasmonics [1] has gained a lot of interest lately due to its potential to tailor novel nonlinear optical materials. Plasmonics is a promising approach as it allows for nanofocusing electromagnetic energy into small spatial regions [2].
We perform third-harmonic (TH) spectroscopy using an 8 fs TiSa laser oscillator on polymer-covered gap-nanoantenna arrays made from gold. We use this hybrid system mainly for two reasons. First, antennas are an ideal system to transfer energy from the far-field of an electromagnetic wave to the near-field around the antenna, especially into the antenna gap region. Second, nonlinear polymers show a very large third-harmonic susceptibility. The combination of this two systems leads to a hybrid system which exhibits a strong wavelength-dependent resonant third-harmonic response function. Furthermore this response is sensitive to the gap size and to the plasmonic resonance of the antennas. [1] M. Kauranen and A.V. Zayats, Nat. Photonics 6, 737*748 (2012) [2] M. Hentschel , T. Utikal, H. Giessen, and M. Lippitz, Nano Lett. 12, 3778-3782 (2012)