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Nano-antenna-assisted harmonic generation |
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| Authors: | Nils Pfullmann Christian Waltermann Milutin Kovačev Vanessa Knittel Rudolf Bratschitsch Dieter Akemeier Andreas Hütten Alfred Leitenstorfer Uwe Morgner |
| Affiliation: | 1. Institut für Quantenoptik, Leibniz Universit?t Hannover, Welfengarten 1, 30167, Hannover, Germany 2. QUEST, Centre for Quantum Engineering and Space-Time Research, Hannover, Germany 3. Department of Physics, Center for Applied Photonics, University of Konstanz, 78457, Konstanz, Germany 4. Institut für Physik, Dynamik nanoskopischer und mesoskopischer Strukturen, Technische Universit?t Chemnitz, 09107, Chemnitz, Germany 5. Thin Films and Physics of Nanostructures, Department of Physics, Bielefeld University, 35501, Bielefeld, Germany 6. Laser Zentrum Hannover e.V., Hannover, Germany |
| Abstract: | We report on low-order harmonic generation utilising the plasmonic field enhancement in arrays of rod-type gold optical antennae. Furthermore, we examine their suitability to support high-order harmonic generation (HHG). The low-order harmonics are used as a tool to investigate the nonlinear properties of the antennae. Particular attention is paid to the thermal properties, which become significant at the peak intensities necessary for HHG. A theoretical model explains the experimental findings and enables future improvements. In experiments we observe up to the fifth harmonic order and measure a field enhancement sufficient to support high-order harmonic generation. Moreover, we find a damage threshold for the antennae. |
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