Investigation of the nonlinear optical rectification coefficient in a multilayered spherical quantum dot

We make a rigorous exploration of profiles of nonlinear optical rectification (NOR) coefficient of impurity doped quantum dots (QDs) in presence and absence of noise. We have exploited Gaussian white noise in the present study. The quantum dot is doped with Gaussian impurity. Noise has been introduced to the system additively and multiplicatively. A perpendicular magnetic field serves as a confinement source and a static external electric field has been applied. The NOR profiles have been monitored as a function of incident photon energy when several important parameters such as electric field strength, magnetic field strength, confinement energy, dopant location, relaxation time, Al concentration, dopant potential, and noise strength assume different values. In addition, the role of mode of application of noise (additive/multiplicative) on the NOR profiles has also been examined thoroughly. The NOR profiles are found to be endowed with interesting observations such as shift of peak position and maximization/minimization of peak intensity. However, presence of noise prominently alters the features of NOR profiles through some interesting manifestations and often induces one photon resonance enhancement. Furthermore, the mode of application of noise (additive/multiplicative) also controls the NOR profiles in disparate as well as often contrasting manners. The observations indicate possibilities of tailoring the NOR coefficient of doped QD systems in presence of noise which bears tremendous technological importance.

Hydrogenic impurity, external electric and magnetic fields effects on the nonlinear optical properties of a multi-layer spherical quantum dot

Study of photoionization cross section and binding energy of shallow donor impurity in multilayered spherical quantum dot

The nonlinear optical rectification and second harmonic generation of a single electron confined in a multilayer spherical quantum dot

Optical rectification in quantum wells within different confinement and nonlinearity regimes

Laser-induced nonlinear optical rectification in a two-dimensional quantum pseudodot system

Nonlinear optical rectification effects in an asymmetric quantum well was investigated. Analytical expression of optical rectification coefficient was deduced by using density-matrix method. The larger optical rectification coefficient can be obtained by choosing an appropriate parameter a. The optical rectification coefficient increases with the enhancement of the asymmetry of the quantum well. The larger the asymmetry of quantum well is, the bigger the peak value will be. Moreover, with the increasing of asymmetry of quantum well, the peaks move to the left side of the figure. This is a feasible way to get fine nonlinear materials in experiment.

The nonlinear optical rectification of an ellipsoidal quantum dot with impurity in the presence of an electric field

Optical rectification coefficient of a two-dimensional quantum pseudodot system

Nonlinear optical rectification in parabolic quantum dots in the presence of electric and magnetic fields

Optical absorption coefficients of a single electron in a multilayer spherical quantum dot with a Kratzer-like confinement potential

The effect of metal nano particle on optical absorption coefficient of multi-layer spherical quantum dot

Nonlinear optical properties of morse quantum well modulated by THz laser fields

The problem of saturation of intersubband absorption and optical rectification in asymmetric quantum wells is discussed theoretically using the density matrix formalism. The effects of the electron-electron interaction are taken into account. It is shown that near the resonance the spectral shapes of the nonlinear optical absorption coefficient and the nonlinear optical rectification coefficient are very similar. In the absence of the electron-electron interaction the spectral responses are nearly Lorentzian. The electron-electron interaction plays an important role in heavy doped systems. In structures with large spatial separation of the ground and the excited states wave functions, the depolarization effect is small and the absorption spectrum is affected mainly by the electrostatic Coulomb interaction. This interaction shifts the absorption peak to higher energy by an amount depending on the intensity of the incident light and leads to the significant distortion (asymmetry) of the line.

Electric field effects on nonlinear optical rectification in symmetric coupled AlxGa1−xAs/GaAs quantum wells