Role of intense laser-excited dressed states via electromagnetically induced transparency on the Fresnel-Fizeau photon drag through an asymmetric double quantum dot molecule (GaAs/AlGaAs) in the Λ-type configuration

Abstract

Hereby, we first report theoretical demonstration on the role of intense laser-excited dressed states on the superluminal-assisted propagation, optical properties, and lateral and rotary photon drag, via electromagnetically induced transparency (EIT). For this, we employed a scheme of an asymmetric double quantum dot molecule GaAs/AlGaAs in the Λ − type configuration. In particular, using the compact density-matrix formulism, we present a detailed analytical solution for the required eigenvalues of the system in view of the dressed states. The dressed-states played a vital role on the formation of EIT and hence the modification of dispersion and absorption spectra of the system via quantum interference. The calculated theoretical results on the optical properties such as absorption and dispersion spectrum, group index, group velocity , group delay, phase delay and photon drag are further elaborated with the aid of numerical simulation. Switching ON the control field, the OFF-field single ON-resonance absorption peak split into an OFF-resonance absorption doublet accompanied by an ON-resonance absorption-less dip in the form of EIT window. Interestingly, the absorption doublet split further into an absorption peak and a gain singlet well below and just above the resonance, at a small control field detuning. Further increase in the control-field detuning resulted in a near-resonance gain singlet. Alongside, by tuning various spectral parameters, we observed an interesting switching from luminal to subluminal and superluminal propagation. The optimal calculated values of positive and negative group velocity are 6 × 10 11 m/s and − 2.5 × 10 11 m/s, respectively. The predicted lateral and rotary photon drag are of order ± 6 × 10 − 8 rad. • Role of dressed sates in view of EIT coherence on the light propagation, optical properties and photon drag. • The nature of dressed states influence largely the optical properties such as group index, group velocity, group delay, and photon drag. • The optimal values of positive and negative group velocity are 6 × 10 11 m/s and − 2.5 × 10 11 m/s, respectively. • The calculated lateral and rotary photon drag are of order ± 6 × 10 − 8 rad.