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- X. Gao, I. Knezevic
- 2008

We present a detailed investigation of the effects that optical-phonon confinement has on the electronic transport properties of GaAs-based midinfrared multiple-quantum-well MQW quantum cascade lasers QCLs . The macroscopic dielectric continuum model is used to describe the interface IF and confined CF optical phonon modes. Dispersions of the IF modes are… (More)

- X. Gao, Marie-Claire D'Souza, Dan Botez, I. Knezevic
- 2007 International Conference on Numerical…
- 2007

We present the design and optimization of a deep-well GaAs-based quantum cascade laser (QCL) emitting at 6.7 μm, the shortest wavelength in GaAs-based QCLs, using a multivalley Monte Carlo simulation. The simulation is performed self-consistently with the design process. The optimized structure exhibits sufficient gain to achieve lasing at both 77 K… (More)

- X. Gao
- 2013

The Eshelby-type problem of an arbitrary-shape polyhedral inclusion embedded in an infinite homogeneous isotropic elastic material is analytically solved using a simplified strain gradient elasticity theory (SSGET) that contains a material length scale parameter. The Eshelby tensor for a polyhedral inclusion of arbitrary shape is obtained in a general… (More)

- X. Gao, Dan Botez, I. Knezevic
- 2008

II. Theoretical Approach 11 A. Boltzmann-Like Transport Equation for QCLs 11 1. Ensemble Monte Carlo Method 13 B. Electronic States 16 1. Γ-valley electronic states 16 2. X-valley electronic states 20 C. Self-Consistent Schrödinger-Poisson Solver 23 D. Scattering Mechanisms 27 1. Electron-longitudinal optical (LO) phonon scattering 28 2. Intervalley… (More)

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