Intersubband gain in a Bloch oscillator and Quantum cascade laser
arXiv:cond-mat/0205359 · doi:10.1103/PhysRevB.67.085315
Abstract
The link between the inversion gain of quantum cascade structures and the Bloch gain in periodic superlattices is presented. The proposed theoretical model based on the density matrix formalism is able to treat the gain mechanism of the Bloch oscillator and Quantum cascade laser on the same footing by taking into account in-plane momentum relaxation. The model predicts a dispersive contribution in addition to the (usual) population-inversion-dependent intersubband gain in quantum cascade structures and - in the absence of inversion - provides the quantum mechanical description for the dispersive gain in superlattices. It corroborates the predictions of the semi-classical miniband picture, according to which gain is predicted for photon energies lower than the Bloch oscillation frequency, whereas net absorption is expected at higher photon energies, as a description which is valid in the high-temperature limit. A red-shift of the amplified emission with respect to the resonant transition energy results from the dispersive gain contribution in any intersubband transition, for which the population inversion is small.
10 pages, 6 figures
References in corpus (2)
Cited by in corpus (27)
- Coherence of resonant-tunneling transport in terahertz quantum-cascade lasers
- A phonon scattering assisted injection and extraction based terahertz quantum cascade laser
- Bloch gain in dc-ac-driven semiconductor superlattices in the absence of electric domains
- Sequential resonant tunneling in quantum cascade lasers
- Density matrix Monte Carlo modeling of quantum cascade lasers
- Theory of parametric amplification in in superlattices
- Model of the Influence of an External Magnetic Field on the Gain of Terahertz Radiation from Semiconductor Superlattices
- Free carrier absorption in quantum cascade structures
- THz parametric gain in semiconductor superlattices in the absence of electric domains
- Metal-less Metamaterial for Surface Plasmon Polariton guiding and amplification
- Quantum transport in weakly coupled superlattices at low temperature
- Gain without inversion in a biased superlattice
- Relevance of intra- and inter-subband scattering on the absorption in heterostructures
- Sensitive dependence of the linewidth enhancement factor on electronic quantum effects in quantum cascade lasers
- Excitation of relaxation oscillations in a semiconductor superlattice by incident waves: efficient terahertz harmonics generation
- Density-matrix model for photon-driven transport in quantum cascade lasers
- Nonresonant two-level transitions: Lessons from quantum thermodynamics
- Negative free carrier absorption in terahertz quantum cascade lasers
- Terahertz Bloch oscillator with suppressed electric domains: Effect of elastic scattering
- An effective density matrix approach for intersubband plasmons coupled to a cavity field: electrical extraction/injection of intersubband polaritons
- The non-linear terahertz response of hot electrons in low-dimensional semiconductor superlattices: Suppression of the polar-optical phonon scattering
- Frequency comb generation by Bloch gain induced giant Kerr nonlinearity
- Partially coherent electron transport in terahertz quantum cascade lasers based on a Markovian master equation for the density matrix
- Numerically efficient density-matrix technique for modeling electronic transport in midinfrared quantum cascade lasers
- Complex permittivity of a biased superlattice
- Direct polariton-to-electron tunneling in quantum cascade detectors operating in the strong light-matter coupling regime
- High-field transport in semiconductor superlattices for interacting Wannier-Stark levels