publication . Article . Other literature type . 2020

Terahertz absorption-saturation and emission from electron-doped germanium quantum wells

Chiara Ciano; Michele Virgilio; Luigi Bagolini; Leonetta Baldassarre; Alexej Pashkin; Manfred Helm; Michele Montanari; Luca Persichetti; Luciana Di Gaspare; Giovanni Capellini; ...
Open Access English
  • Published: 01 Jan 2020
  • Publisher: OSA - The Optical Society
We study radiative relaxation at terahertz frequencies in n-type Ge/SiGe quantum wells, optically pumped with a terahertz free electron laser. Two wells coupled through a tunneling barrier are designed to operate as a three-level laser system with non-equilibrium population generated by optical pumping around the 1→3 intersubband transition at 10 THz. The non-equilibrium subband population dynamics are studied by absorption-saturation measurements and compared to a numerical model. In the emission spectroscopy experiment, we observed a photoluminescence peak at 4 THz, which can be attributed to the 3→2 intersubband transition with possible contribution from the ...
arXiv: Physics::OpticsCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter::Other
free text keywords: quantum cascade laser, terahertz, saturable absorber, Atomic and Molecular Physics, and Optics, Optical pumping, Optoelectronics, business.industry, business, Terahertz radiation, Quantum well, Free-electron laser, Emission spectrum, Population, education.field_of_study, education, Physics, Laser, law.invention, law, Photoluminescence
Funded by
Far-infrared Lasers Assembled using Silicon Heterostructures
  • Funder: European Commission (EC)
  • Project Code: 766719
  • Funding stream: H2020 | RIA
FET H2020FET OPEN: FET-Open research and innovation actions
FET H2020FET OPEN: Far-infrared Lasers Assembled using Silicon Heterostructures
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