Journal ArticleDOI
Effect of position-dependent effective mass on linear and nonlinear optical properties of a cubic quantum dot
TLDR
In this article, the position-dependent effective mass in a GaAs/AlxGa1−xAs cubic quantum dot is studied and an analytic relation for studying the position dependent effective mass is obtained for the intersubband optical absorption coefficient and refractive index change in the quantum dot.Abstract:
In this paper, we first obtain an analytic relation for studying the position-dependent effective mass in a GaAs/AlxGa1−xAs cubic quantum dot. Then, the effect of position-dependent effective mass on the intersubband optical absorption coefficient and the refractive index change in the quantum dot are studied. Our numerical calculations are performed using both a constant effective mass and the position-dependent effective mass. We calculate the linear, nonlinear and total intersubband absorption coefficient and refractive index change as a function of the incident optical intensity and structural parameters such as dot length. The results obtained from the present work show that spatially varying electron effective mass plays an important role in the intersubband optical absorption coefficient and refractive index change in a cubic quantum dot.read more
Citations
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Journal ArticleDOI
Optical properties of spherical quantum dot with position-dependent effective mass
Alireza Keshavarz,Naser Zamani +1 more
TL;DR: In this paper, the effects of position-dependent effective mass on the optical properties of a 3D quantum dot are numerically investigated by using the point canonical transformation method and numerical solution of the Schrodinger equation.
Journal ArticleDOI
Influence of position-dependent effective mass on the nonlinear optical properties in AlxGa1−xAs/GaAs single and double triangular quantum wells
Qiang Zhao,S. Aqiqi,Jin-Feng You,M. Kria,Kangxian Guo,El Mustapha Feddi,Zhi-Hai Zhang,Jian-Hui Yuan +7 more
TL;DR: In this paper, position dependent effective mass (PDEM) and the shape of the confined potential of triangular quantum wells (TQWs) were investigated. And the authors showed that the PDEM plays a vital and considerable role in the electronic and optical properties of single and double TQWs.
Journal ArticleDOI
Effect of position-dependent effective mass on linear and nonlinear optical properties in a quantum dot
TL;DR: In this paper, the effect of constant effective mass and position-dependent effective mass on the optical properties of a spherical quantum dot has been studied, and the intersubband optical absorption coefficient and the refractive index changes are obtained using both a constant effectivemass and position dependent effective mass.
Journal ArticleDOI
Influence of position-dependent effective mass on the nonlinear optical properties of impurity doped quantum dots in presence of Gaussian white noise
TL;DR: In this paper, the influence of position-dependent effective mass (PDEM) on a few nonlinear optical properties of impurity doped quantum dots (QDs) in presence and absence of noise was examined.
Journal ArticleDOI
The nonlinear optical rectification in asymmetrical and symmetrical Gaussian potential quantum wells with applied electric field
TL;DR: In this paper, a detailed investigation of nonlinear optical rectification of asymmetrical and symmetrical Gaussian potential quantum wells (QWs) under the influence of applied electric field by using the compact-density-matrix approach is presented.
References
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Book
Quantum dot heterostructures
TL;DR: In this paper, the growth and structural characterisation of self-organized Quantum Dots are discussed. But they do not consider the model of ideal and real quantum Dots.
Journal ArticleDOI
Low-dimensional systems: quantum size effects and electronic properties of semiconductor microcrystallites (zero-dimensional systems) and some quasi-two-dimensional systems
TL;DR: In this paper, a review is concerned with quantum confinement effects in low-dimensional semiconductor systems, focusing on the optical properties, including luminescence, of nanometre-sized microcrystals.
Journal ArticleDOI
First observation of an extremely large‐dipole infrared transition within the conduction band of a GaAs quantum well
L. C. West,S. J. Eglash +1 more
TL;DR: In this paper, a dipole occurs between two envelope states of the conduction-band electron wave function, and is called a quantum well envelope state transition (QWEST).
Journal ArticleDOI
Linear and nonlinear optical absorption coefficients and refractive index changes in spherical quantum dots : Effects of impurities, electric field, size, and optical intensity
TL;DR: In this article, a spherical quantum dot with parabolic confinement subjected to an external electric field with the presence of an impurity, the linear and third-order nonlinear optical absorption coefficients as well as refractive index changes have been calculated.