Control of electron–optical-phonon scattering rates in quantum box cascade lasers

Smirnov, Dmitry; Becker, C.; Drachenko, O.; Rylkov, V. V.; Page, H.; Leotin, J.; Sirtori, Carlo

doi:10.1103/physrevb.66.121305

Cited by 53 publications

(44 citation statements)

References 28 publications

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“…E 0 n is the energy of the subband edge at zero magnetic field. The effect of the magnetic field on the QCD dark current is quite similar to what happens in a three-level active region of a quantum cascade laser where electron-scattering from the upper state is modulated by magnetic field 8 . Indeed, depending on the value of the magnetic field, the Landau level arrangement strongly influences the absorption or emission of optical phonons from the various |1 ′ , p levels to |n, 0 , where |n, p designates the p Landau level originating from subband n. Figure 3 illustrates the effect of the Landau level quantization by a magnetic field on the dark current taking as example level |6, 0 .…”

Section: Magneto-transport Measurementssupporting

confidence: 52%

“…This model is able, without any adjustable parameter, to give an excellent value of the resistance of a QCD. Starting from the well-known electron−LO phonon transition rate 8 , this model is based on an analogy with the p-n junction, an archetype system where two reservoirs (the conduction and valence band) are separated by a conduction bottleneck. In our case, it has been shown that intra-cascade global transition rates are several orders of magnitude higher than inter-cascade global transition rates such that two neighboring cascades (A and B) act as two reservoirs separated by a bottleneck.…”

Section: Theoretical Model Of Dark Transport In Qcdsmentioning

confidence: 99%

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Dark current analysis of quantum cascade detectors by magnetoresistance measurements

et al. 2008

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Magneto-transport experiments have been performed on Quantum Cascade Detectors. These experiments lead to the identification of the different electronic transitions from subbands in one cascade period to subbands in the following one. These transitions contribute to the total current flowing through the structure in the absence of illumination. This dark current is well described within a simple model based on the sum of diffusion events from one cascade to the next one through optical phonon mediated transitions. For the first time, the optical and electronic properties of such a complex heterostructure can be fully predicted without any other adjustable parameter than the doping density. This opens the way to a full quantum design of an infrared detector, in contrast with the phenomenological optimization of structures usually performed in this field.

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Section: Magneto-transport Measurementssupporting

confidence: 52%

Section: Theoretical Model Of Dark Transport In Qcdsmentioning

confidence: 99%

Dark current analysis of quantum cascade detectors by magnetoresistance measurements

et al. 2008

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“…[1][2][3][4][5][6][7] Considerable output power, room-temperature operation, as well as the ability to get a range of lasing wavelengths using the same material system, opens up a number of potential applications for these devices, such as trace gas detection, polution control, medical diagnostics, optical communications in high-transparency atmospheric windows, etc. 4 QCL operation is based on intersubband optical transitions, between size-quantized states within the conduction band of multiple quantum well type structures.…”

Section: Introductionmentioning

confidence: 99%

Electron-phonon relaxation rates and optical gain in a quantum cascade laser in a magnetic field

Radovanović

Milanović²,

Ikonić

et al. 2005

Journal of Applied Physics

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We present a model for calculating the optical gain in a midinfrared GaAs/ AlGaAs quantum cascade laser in a magnetic field, based on solving the set of rate equations that describe the carrier density in each level, accounting for the optical-and acoustic-phonon scattering processes. The confinement caused by the magnetic field strongly modifies the lifetimes of electrons in the excited state and results in pronounced oscillations of the optical gain as a function of the field. Numerical results are presented for the structure designed to emit at ϳ 11.4 m, with the magnetic field varying in the range of 10-60 T. The effects of band nonparabolicity are also included.

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“…21,22 Also a quantum-dash cascade structure was proposed. 23 Another possibility is to use self-assembled quantum dots (QDs).…”

Section: -20mentioning

confidence: 99%

Microscopic model for intersubband gain from electrically pumped quantum-dot structures

2014

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We study theoretically the performance of electrically pumped self-organized quantum dots as a gain material in the mid-IR range at room temperature. We analyze an AlGaAs/InGaAs based structure composed of dots-in-a-well sandwiched between two quantum wells. We numerically analyze a comprehensive model by combining a many-particle approach for electronic dynamics with a realistic modeling of the electronic states in the whole structure. We investigate the gain both for quasi-equilibrium conditions and current injection. Comparing different structures we find that steady-state gain can only be realized by an efficient extraction process, which prevents an accumulation of electrons in continuum states, that make the available scattering pathways through the quantum dot active region too fast to sustain inversion. The tradeoff between different extraction/injection pathways is discussed. Comparing the modal gain to a standard quantum-well structure as used in quantum cascade lasers, our calculations predict reduced threshold current densities of the quantum dot structure for comparable modal gain. Such a comparable modal gain can, however, only be achieved for an inhomogeneous broadening of a quantum-dot ensemble that is close to the lower limit achievable today using self-organized growth.

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Control of electron–optical-phonon scattering rates in quantum box cascade lasers

Cited by 53 publications

References 28 publications

Dark current analysis of quantum cascade detectors by magnetoresistance measurements

Dark current analysis of quantum cascade detectors by magnetoresistance measurements

Electron-phonon relaxation rates and optical gain in a quantum cascade laser in a magnetic field

Microscopic model for intersubband gain from electrically pumped quantum-dot structures

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