Optically-induced nonlinearities and polarization modulation of spin dichroism in CdSe quantum dots

Abstract

Polarization modulation in CdSe quantum dots is presented in the framework of the optically-induced nonlinearities of spin dichroism. The real and the imaginary parts of the phase retardation, which are induced from the nonlinear refractive index of the spin-degenerate fine states, are shown spectrally. The polarization modulation is also described in terms of the Jones vector, where the spectral dependences of the amplitude and phase are shown. The optically-induced elliptical polarization of a Gaussian pulse in a feasible condition of multi-quantum dot-layers is predicted precisely in terms of the rotational and the elliptical angles for increasing pulse area up to π, which is also mapped on a the normalized Poincare sphere.