Study of optical properties in a cubic quantum dot

Abstract

In this paper, the effect of hydrostatic pressure on both the intersubband optical absorption coefficients and the refractive index changes is studied for typical GaAs/Al x Ga 1−x As cubic quantum dot. We use analytical expressions for the linear and third-order nonlinear intersubband absorption coefficients and refractive index changes obtained by the compactdensity matrix formalism. The linear, third-order nonlinear, and total intersubband absorption coefficients and refractive index changes are calculated at different pressures as a function of the photon energy with known values of box length (L), the incident optical intensity (I ), and Al concentration (x). According to the results obtained from the present work, we have found that the pressure plays an important role in the intersubband optical absorption coefficient and refractive index changes in a cubic quantum dot.

Three-dimensional bound states of cylindrical quantum heterostructures with position-dependent mass carriers

“…Quantum dots (microscopic structures in which the electrons dynamics are strongly restricted in space) can be modelled by considering charge carriers with position-dependent masses [20,[24][25][26][27]. The electronic and optical properties of these nanostructures can be engineered and fine tuned by changing their size and shape [28][29][30][31][32]. It is often useful to make nanowire connections of cylindrical shape [33,34].…”

Linear and nonlinear optical absorption coefficients of two-electron spherical quantum dot with parabolic potential

“…Confined quantum systems have been one of the most important subjects of investigation. Therefore, due to their fundamental properties and their wide range of technological applications [1], a great deal of theoretical works on these structures has been reported extensively by using different methods like a finite element method [2,3], perturbation [4], density functional [5,6], configuration interaction [7,8], variational [9,10], exact solution [11], quantum genetic algorithm and Hartree-Fock Roothaan method [12] and other methods [13,14]. Understanding of the electronic and optical properties in such structures is important because these properties are strongly affected by the presence of impurity.…”

A theoretical study of nonlinear optical absorption and refractive index changes with the three-dimensional ring-shaped pseudoharmonic potential

“…In the researches above, changing the shapes and sizes of quantum systems is often used to do researches on nonlinear optical effects. For example, cubic [3,4], spherical [5][6][7][8], diskshaped [9][10][11][12], cylindrical [13][14][15], ring [16] quantum dots are studied by some researchers. Besides, there are many physical factors that have great influences on nonlinear optical effects.…”