Two-photon absorbtion in quantum dot with Yukawa potential

Abstract

We study the nonlinear optical absorption properties of Yukawa potential quantum dots, especially focusing on the phenomenon of two-photon absorption (TPA) and using GaAs as illustrative material. The research results show a clear difference between intra-band and inter-band transitions: the intra-transitions have a narrower TPA spectrum and a higher maximum value because the transition energy has a smaller value compared to interregional one. Notably, the peak corresponding to   is always located to the left of the peak corresponding to . Furthermore, the absorption peak position shows a different dependence on the displacement order, n, for intra- and inter-transitions. We also observe a blue-shift trend in the TPA spectrum with increasing values of both parameters  and  . These findings hold important promise for the development of improved photonic devices by optimizing the material properties of quantum dots.