Plasmonic mid-infrared third harmonic generation in germanium nanoantennas

Marco P. Fischer; Aaron Riede; Kevin Gallacher; Jacopo Frigerio; Giovanni Pellegrini; Michele Ortolani; Douglas J. Paul; Giovanni Isella; Alfred Leitenstorfer; Paolo Biagioni; Daniele Brida

doi:10.1038/s41377-018-0108-8

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Plasmonic mid-infrared third harmonic generation in germanium nanoantennas

Original Articles

- Plasmonic mid-infrared third harmonic generation in germanium nanoantennas
- Light: Science & Applications Vol. 7, Issue 6, Pages: 1001-1007(2018)
- Affiliations：
  
  1.Department of Physics and Center for Applied Photonics, University of Konstanz, 78457, Konstanz, Germany
  2.School of Engineering, University of Glasgow, Rankine Building, Oakfield Avenue, Glasgow, G12 8LT, UK
  3.L-NESS, Dipartimento di Fisica del Politecnico di Milano, Via Anzani 42, 22100, Como, Italy
  4.Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy
  5.Department of Physics, Sapienza University of Rome, 00185, Rome, Italy
  6.Physics and Materials Science Research Unit, University of Luxembourg, 162a avenue de la Faïencerie, L-1511, Luxembourg, Luxembourg
- Author bio：
  
  Daniele Brida (daniele.brida@uni.lu)
- Funds：
- DOI：10.1038/s41377-018-0108-8
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Fischer, M. P. et al. Plasmonic mid-infrared third harmonic generation in germanium nanoantennas. Light: Science & Applications, 7, 1001-1007 (2018).
DOI：

Fischer, M. P. et al. Plasmonic mid-infrared third harmonic generation in germanium nanoantennas. Light: Science & Applications, 7, 1001-1007 (2018). DOI： 10.1038/s41377-018-0108-8.

摘要

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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references

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