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Nonlinear Photoluminescence Spectrum of Single Gold Nanostructures

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journal contribution
posted on 27.01.2015 by Vanessa Knittel, Marco P. Fischer, Tjaard de Roo, Stefan Mecking, Alfred Leitenstorfer, Daniele Brida
We investigate the multiphoton photoluminescence characteristics of gold nanoantennas fabricated from single crystals and polycrystalline films. By exciting these nanostructures with ultrashort pulses tunable in the near-infrared range, we observe distinct features in the broadband photoluminescence spectrum. By comparing antennas of different crystallinity and shape, we demonstrate that the nanoscopic geometry of plasmonic devices determines the shape of the emission spectra. Our findings rule out the contribution of the gold band structure in shaping the photoluminescence.