Optical Activation of Germanium Plasmonic Antennas in the Mid Infrared

Impulsive interband excitation with femtosecond near-infrared pulses establishes a plasma response in intrinsic germanium structures fabricated on a silicon substrate. This direct approach activates the plasmonic resonance of the Ge structures and enables their use as optical antennas up to the mid-...

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Bibliographic Details
Published inarXiv.org
Main Authors Fischer, Marco P, Schmidt, Christian, Sakat, Emilie, Stock, Johannes, Samarelli, Antonio, Frigerio, Jacopo, Ortolani, Michele, Paul, Douglas J, Isella, Giovanni, Leitenstorfer, Alfred, Biagioni, Paolo, Brida, Daniele
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 10.06.2016
Subjects
Antenna arrays
Antennas
Femtosecond pulses
Germanium
Holes (electron deficiencies)
Infrared spectra
Optical switching
Physics - Mesoscale and Nanoscale Physics
Physics - Optics
Plasma frequencies
Silicon substrates
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Summary:Impulsive interband excitation with femtosecond near-infrared pulses establishes a plasma response in intrinsic germanium structures fabricated on a silicon substrate. This direct approach activates the plasmonic resonance of the Ge structures and enables their use as optical antennas up to the mid-infrared spectral range. The optical switching lasts for hundreds of picoseconds until charge recombination red-shifts the plasma frequency. The full behavior of the structures is modeled by the electrodynamic response established by an electron-hole plasma in a regular array of antennas.
ISSN:2331-8422
DOI:10.48550/arxiv.1603.06339