27 February 2015 Linear and non-linear response of lithographically defined plasmonic nanoantennas
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Abstract
We present numerical studies, nano-fabrication and optical characterization of bowtie nanoantennas demonstrating their superior performance with respect to the electric field enhancement as compared to other Au nanoparticle shapes. For optimized parameters, we found mean intensity enhancement factors >2300x in the feed-gap of the antenna, decreasing to 1300 x when introducing a 5nm titanium adhesion layer. Using electron beam lithography we fabricated gold bowties on various substrates with feed-gaps and tip radii as small as 10 nm. In polarization resolved measurement we experimentally observed a blue shift of the surface plasmon resonance from 1.72 eV to 1.35 eV combined with a strong modification of the electric field enhancement in the feed-gap. Under excitation with a 100 fs pulsed laser source, we observed non-linear light emission arising from two-photon photoluminescence and second harmonic generation from the gold. The bowtie nanoantenna shows a high potential for outstanding conversion efficiencies and the enhancement of other optical effects which could be exploited in future nanophotonic devices.
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K. Schraml, K. Schraml, M. Kaniber, M. Kaniber, J. Bartl, J. Bartl, G. Glashagen, G. Glashagen, A. Regler, A. Regler, T. Campbell, T. Campbell, J. J. Finley, J. J. Finley, "Linear and non-linear response of lithographically defined plasmonic nanoantennas", Proc. SPIE 9371, Photonic and Phononic Properties of Engineered Nanostructures V, 93711D (27 February 2015); doi: 10.1117/12.2079104; https://doi.org/10.1117/12.2079104
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