Plasmonic mid-infrared third harmonic generation in germanium nanoantennas

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2018
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Gallacher, Kevin
Frigerio, Jacopo
Pellegrini, Giovanni
Ortolani, Michele
Paul, Douglas J.
Isella, Giovanni
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Light : Science & Applications (LSA) ; 7 (2018). - 106. - eISSN 2047-7538
Abstract
We demonstrate third harmonic generation in plasmonic antennas consisting of highly doped germanium grown on silicon substrates and designed to be resonant in the mid-infrared frequency range that is inaccessible with conventional nonlinear plasmonic materials. Owing to the near-field enhancement, the result is an ultrafast, subdiffraction, coherent light source with a wavelength tunable between 3 and 5 µm, and ideally overlapping with the fingerprint region of molecular vibrations. To observe the nonlinearity in this challenging spectral window, a high-power femtosecond laser system equipped with parametric frequency conversion in combination with an all-reflective confocal microscope setup is employed. We demonstrate spatially resolved maps of the linear scattering cross section and the nonlinear emission of single isolated antenna structures. A clear third-order power dependence as well as mid-infrared emission spectra prove the nonlinear nature of the light emission. Simulations support the observed resonance length of the double-rod antenna and demonstrate that the field enhancement inside the antenna material is responsible for the nonlinear frequency mixing.
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530 Physics
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ISO 690FISCHER, Marco P., Aaron RIEDE, Kevin GALLACHER, Jacopo FRIGERIO, Giovanni PELLEGRINI, Michele ORTOLANI, Douglas J. PAUL, Giovanni ISELLA, Alfred LEITENSTORFER, Daniele BRIDA, 2018. Plasmonic mid-infrared third harmonic generation in germanium nanoantennas. In: Light : Science & Applications (LSA). 7, 106. eISSN 2047-7538. Available under: doi: 10.1038/s41377-018-0108-8
BibTex
@article{Fischer2018-12-12Plasm-44360,
  year={2018},
  doi={10.1038/s41377-018-0108-8},
  title={Plasmonic mid-infrared third harmonic generation in germanium nanoantennas},
  volume={7},
  journal={Light : Science & Applications (LSA)},
  author={Fischer, Marco P. and Riede, Aaron and Gallacher, Kevin and Frigerio, Jacopo and Pellegrini, Giovanni and Ortolani, Michele and Paul, Douglas J. and Isella, Giovanni and Leitenstorfer, Alfred and Brida, Daniele},
  note={Article Number: 106}
}
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