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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Acknowledgments
This work was funded by Deutsche Forschungsgemeinschaft within the Cluster of Excellence QUEST, Centre for Quantum Engineering and Space-Time Research.
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Pfullmann, N., Waltermann, C., Kovačev, M. et al. Nano-antenna-assisted harmonic generation. Appl. Phys. B 113, 75–79 (2013). https://doi.org/10.1007/s00340-013-5424-3
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DOI: https://doi.org/10.1007/s00340-013-5424-3