Nonlinear Optical Properties in II-VI Oxide Quantum Dot Nanostructure

Abstract

In the present work, some electronic and nonlinear optical properties are studied in a CdO/ZnO core/shell quantum dot nanostructure taking into account the spatial confinement effect. The binding energy of an electron-hole pair is computed using Smorodinsky-Winternitz potential and the second harmonic generation is studied with the function of photon energy. The potential used in the Hamiltonian is different on both the sides of the barrier involving a two parametrical potential. The exciton binding energy is obtained employing variational method within a single band effective mass approximation and the nonlinear optical properties are probed using density matrix approach within a two level system. The larger exciton binding energies of these materials bring out the stability of electron-hole pair at room temperature. The results show that these properties are enhanced in the strong geometrical confinement region. The resonant peaks in the second harmonic generation are strongly influenced by the geometrical confinement, confined potential, matrix elements and the structural parameters. Thus, the obtained results on nonlinear optical properties of wide band gap semiconducting material will be helpful for the response to the industrial demand for optoelectronic devices operating the entire spectral region in the visible spectrum.