Electromagnetically induced transparency and slow light in a-type three-level system of GaAs/AlGaAs multiple quantum wells

摘要

A Δ-type three-level system of GaAs/AlGaAs multiple quantum wells (MQWs) was constructed by using exciton spin coherence in the transient optical response. Theoretical analysis with density matrix and Maxwell equations then yielded the phase shift, absorption, group velocity and group velocity dispersion. The calculated velocity is ～6.14×10 ~4m/s and the corresponding pulse delay is ～8ps. A convenient basis is provided for investigating how many-body effects in semiconductors modify the magnitude, spectral shape, and space and time dependence of the electromagnetically induced transparency phenomenon.