Germanium Plasmonic Nanoantennas for Third-Harmonic Generation in the Mid Infrared
- Fischer, Marco P.
- Riede, Aaron
- Grupp, Alexander
- Gallacher, Kevin
- Frigerio, Jacopo
- Ortolani, Marco
- Paul, Douglas J.
- Isella, Giovanni
- Leitenstorfer, Alfred
- Biagioni, Paolo
- Brida, Daniele
DOIAbstract
We explore the nonlinear optical properties of plasmonic semiconductor antennas resonant in the mid infrared. The nanostructures are fabricated on silicon substrates from heavily doped germanium films with a plasma frequency of 30 THz, equivalent to a wavelength of 10 μm. Illumination with ultrashort pulses at 10.8 μm produces coherent emission at 3.6 μm via third-harmonic generation
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