Influence of nonparabolicity on electronic structure of quantum cascade laser

Vuković, Nikola; Milanović, V.; Radovanović, J.

doi:10.1016/j.physleta.2014.04.069

Cited by 18 publications

(2 citation statements)

References 24 publications

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“…Several numerical methods have been proposed to obtain a numerical solution of the electron states in the QCL with the consideration of the conduction band NPB in the Schrödinger equation. Firstly, using an energy-dependent one-band effective mass in the Schrödinger equation produced a nonlinear eigenvalue problem, which was numerically solved by the finite element method [15], the transfer matrix method [16], or the finite difference method (FDM) [17]. However, these methods had high computational complexity and limited scalability due to the requirement of complicated iterative or linearization processes.…”

Section: Introductionmentioning

confidence: 99%

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Effect of conduction band non-parabolicity on the optical gain of quantum cascade lasers based on the effective two-band finite difference method

Cho

Kim

2017

Semicond. Sci. Technol.

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We theoretically investigate the effect of conduction band non-parabolicity (NPB) on the optical gain spectrum of quantum cascade lasers (QCLs) using the effective two-band finite difference method. Based on the effective two-band model to consider the NPB effect in the multiple quantum wells (QWs), the wave functions and confined energies of electron states are calculated in two different active-region structures, which correspond to three-QW single-phonon and four-QW double-phonon resonance designs. In addition, intersubband optical dipole moments and polar-optical-phonon scattering times are calculated and compared without and with the conduction band NPB effect. Finally, the calculation results of optical gain spectra are compared in the two QCL structures having the same peak gain wavelength of 8.55 μm. The gain peaks are greatly shifted to longer wavelengths and the overall gain magnitudes are slightly reduced when the NPB effect is considered. Compared with the three-QW active-region design, the redshift of the peak gain is more prominent in the four-QW active-region design, which makes use of higher electronic states for the lasing transition.

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Section: Introductionmentioning

confidence: 99%

“…There have been several reports to compare the calculation results of the electronic subband energies in the three-QW active-region QCLs between the PB and NPB models [15,16]. However, the effect of conduction band NPB on the optical gain spectrum of mid-IR QCLs has not yet been investigated.…”

Section: Introductionmentioning

confidence: 99%