Influence of Size and Position of Defect on Quadratic Electro Optic Effect of GaN/AlGaN Spherical Quantum Dot

In this paper, a new spherical quantum dot is proposed to management and enhancement of third order nonlinear optical susceptibility of quadratic electro optic effect. This nanostructure is containing defective shell surrounding with two well. The size of quantum dot, thickness, position and potential of defect have a significant effect on third order optical susceptibility. By numerically solving of Schrödinger equation in the effective mass approximation the third order nonlinear optical susceptibility were calculated. The results are shown that with increasing of dot size the third order nonlinear optical susceptibility is increased. Also, with increasing of defect shell thickness the third order nonlinear optical susceptibility is increased and resonance wavelength is red shifted. The most value of third order optical susceptibility is available when in the symmetric condition of defect position, the defect potential becomes equal to the barrier potential.