Impurity position effect on optical properties of various quantum dots

• We obtain the energy levels and wave functions using finite element method in the presence of impurity.
• The absorption coefficients and refractive index changes have been obtained.
• The optical properties of a cone like quantum dot are greater than a pyramid quantum dot of same volume and height.
• The impurity location plays an important role in optical properties of a pyramid and a cone like quantum dot.

In this work, we have investigated the effect of impurity position on optical properties of a pyramid and a cone like quantum dot. For this goal, we first obtain the energy levels and wave functions using finite element method (FEM) in the presence of impurity. Then, we have studied the influence of impurity location on refractive index changes and absorption coefficients of the two quantum dots. We found that there is a maximum value for total refractive index changes and absorption coefficients at a special impurity position. Also, we have found that the refractive index changes and absorption coefficients of a cone like quantum dot are greater than a pyramid quantum dot in same volume and height. According to the results, it is deduced that the impurity location plays an important and considerable role in the electronic and optical properties of a pyramid and a cone like quantum dot.

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