Modeling of second harmonic generation in hole-doped silicon-germanium quantum wells for mid-infrared sensing

Mid-Infrared Sensing Using Heavily Doped Germanium Plasmonics on Silicon Substrates

Measurement and modeling of ultrafast carrier dynamics and transport in germanium/silicon-germanium quantum wells.

We measure the intervalley scattering time of electrons in the conduction band of Ge quantum wells from the direct Γ valley to the indirect L valley to be ~185 fs using a pump-probe setup at 1570 nm. We relate this to the width of the exciton peak seen in the absorption spectra of this material, and show that these quantum wells could be used as a fast saturable absorber with a saturation fluen...

Germanium Quantum Wells for High-Performance Modulators in Silicon Photonics

Silicon electronics dominates information processing, and offers a remarkable technology for making very complex systems for very little cost. Many of the waveguide passive optical components that we use today in telecommunications, such as wavelength splitters, use the same technology base – the silicon, silicon dioxide and silicon nitride that are the semiconductors and insulators of electron...

Ultra-doped n-type germanium thin films for sensing in the mid-infrared

A key milestone for the next generation of high-performance multifunctional microelectronic devices is the monolithic integration of high-mobility materials with Si technology. The use of Ge instead of Si as a basic material in nanoelectronics would need homogeneous p- and n-type doping with high carrier densities. Here we use ion implantation followed by rear side flash-lamp annealing (r-FLA) ...

Microscopic modeling of second harmonic generation in quantum cascade lasers

During the last 20 years since the first Quantum Cascade Laser (QCL) [1] there has been substantial development. The long-wavelength limit exploiting intersubband transitions below the reststrahlenband with frequencies in the terahertz range [2] is currently an area of active research but efforts are also being made in the opposite direction towards the short-wavelength limit. As the lasing is ...