Electric field induced exciton binding energy and its non-linear optical properties in a narrow InSb/InGaxSb1−x quantum dot

The effect of electric field on the binding energy, interband emission energy and the non-linear optical properties of exciton as a function of dot radius in an InSb/InGaxSb1−x quantum dot are investigated. Numerical calculations are carried out using single band effective mass approximation variationally to compute the exciton binding energy and optical properties are obtained using the compact density matrix approach. The dependence of the nonlinear optical processes on the dot sizes is investigated for various electric field strength. The linear, third order non-linear optical absorption coefficients, susceptibility values and the refractive index changes of electric field induced exciton as a function of photon energy are obtained. It is found that electric field and the geometrical confinement have great influence on the optical properties of dots.

► Electric field induced exciton binding energy and interband emission energy are investigated InSb/InGaxSb1−x quantum dot. ► Optical properties are obtained using the compact density matrix approach. ► The dependence of the nonlinear optical processes on the dot sizes is investigated for various electric field. ► Some nonlinear optical properties in the presence of electric field are obtained. ► It is found that electric field and the geometrical confinement have great influence on the optical properties of dots.