Far-infrared (λ=88 μm) electroluminescence in a quantum cascade structure

Rochat, Michel; Faist, Jérôme; Beck, Mattias; Oesterle, U.; Ilegems, M.

doi:10.1063/1.122895

Cited by 151 publications

(72 citation statements)

References 14 publications

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“…[1][2][3][4][5] Confinement of such impurities in quasi-two-dimensional GaAs/Al x Ga 1Ϫx As quantum wells ͑QWs͒ allows the tuning of these levels in a controlled way. For device applications the greater range the binding energy of the impurity can be tuned over the better.…”

Section: Introductionmentioning

confidence: 99%

Acceptor binding energy in δ-doped GaAs/AlAs multiple-quantum wells

Zheng

Halsall

Harmer

et al. 2002

Journal of Applied Physics

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ArticleA series of Be ␦-doped GaAs/AlAs multiple-quantum wells with the doping at the well center were grown by molecular beam epitaxy. The photoluminescence spectra were measured at 4, 20, 40, 80, 120, and 200 K, respectively. The two-hole transitions of the acceptor-bound exciton from the ground state, 1S 3/2 (⌫ 6 ), to the first-excited state, 2S 3/2 (⌫ 6 ), have been clearly observed and the acceptor binding energy measured. A variational calculation is presented to obtain the acceptor binding energy as a function of well width. It is found that the experimental results are in good agreement with the theory.

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Section: Introductionmentioning

confidence: 99%

Acceptor binding energy in δ-doped GaAs/AlAs multiple-quantum wells

Zheng

Halsall

Harmer

et al. 2002

Journal of Applied Physics

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“…The prototypical design for THz QCL structure proposed by Rochat et al (1998) was investigated by Köhler et al (2001), and starting from such studies, two other structures were designed. The first one is based on chirped-superlattice design concept (Tredicucci et al 1998).…”

Section: Examples Of MC Studies Of Qclmentioning

confidence: 99%

Monte Carlo modeling applied to studies of quantum cascade lasers

2017

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One of the commonly used approaches of solving electron transport problems in quantum cascade lasers (QCL) is the Monte Carlo (MC) method, based on semiclassical description in the framework of the Boltzmann Transport Equation. A major benefit of MC modeling is that it only relies on well-established material parameters and structure specification, in most cases without the need to use phenomenological parameters. The results of the modeling can be easily interpreted and they give microscopic insight of QCL operation. The goal of the present paper is to review the application of the MC technique to the studies of operation of QCL. The description of the components of the simulation algorithm is provided. Various physical mechanisms governing electron transport in QCL are described and their influence on the operation are reviewed.

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“…6,7 At present the only operational quantum cascade lasers are in the mid-infrared frequency range 8,9 but recently models have been proposed which extend the operating frequency into the far-infrared ͑FIR͒ range 10 and FIR electroluminescence has been observed in multiple quantum well devices. 11 There are difficulties with FIR intersubband devices, however, because the smaller subband separations required are of the order of the longitudinal optical ͑LO͒ phonon energy. This means that detrimental nonradiative transitions are increased, so the quantum efficiency of the device is reduced.…”

Section: Introductionmentioning

confidence: 99%

Self-consistent solutions to the intersubband rate equations in quantum cascade lasers: Analysis of a GaAs/AlxGa1−xAs device

Donovan

Harrison

Kelsall

2001

Journal of Applied Physics

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This is a repository copy of Self-consistent The carrier transition rates and subband populations for a GaAs/AlGaAs quantum cascade laser operating in the mid-infrared frequency range are calculated by solving the rate equations describing the electron densities in each subband self-consistently. These calculations are repeated for a range of temperatures from 20 to 300 K. The lifetime of the upper laser level found by this self-consistent method is then used to calculate the gain for this range of temperatures. At a temperature of 77 K, the gain of the laser is found to be 34 cm Ϫ1 /͑kA/cm Ϫ2 ͒, when only electron-longitudinal-optical phonon transitions are considered in the calculation. The calculated gain decreases to 19.6 cm Ϫ1 /͑kA/cm Ϫ2 ͒ when electron-electron transition rates are included, thus showing their importance in physical models of these devices. Further analysis shows that thermionic emission could be occurring in real devices.

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Far-infrared (λ=88 μm) electroluminescence in a quantum cascade structure

Cited by 151 publications

References 14 publications

Acceptor binding energy in δ-doped GaAs/AlAs multiple-quantum wells

Acceptor binding energy in δ-doped GaAs/AlAs multiple-quantum wells

Monte Carlo modeling applied to studies of quantum cascade lasers

Self-consistent solutions to the intersubband rate equations in quantum cascade lasers: Analysis of a GaAs/AlxGa1−xAs device

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