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Physica E Low-dimensional Systems and Nanostructures

Switching feature of EIT-based slow light giant phase-sensitive Kerr nonlinearity in a semiconductor quantum well

Hamid Reza Hamedi, Mohammad Reza Mehmannavaz

Published Oct 30, 2014• 26 citations
Publisher
DOI
10.1016/j.physe.2014.10.018

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Physica Scripta•Oct 30, 2019•7 citations
A four level ladder scheme is employed for the realization of slow light large Kerr nonlinear indices in an asymmetric semiconductor three-coupled-quantum-well (TCQW) structure based on intersubband transitions. It is shown that a giant Kerr nonlinearity accompanied with negligible loss can be achieved by properly tuning the intensity of the control fields. A dressed state analysis is given to explain the origin of such a transparency based on slow light enhanced Kerr nonlinearity in this solid medium. In addition, we show that the three-photon detuning plays the important role in enhancing the third-order nonlinearity of the TCQW medium, and may provide new possibilities for technological applications in nonlinear optics and optical switching.
Abstract We propose an analytical model to study the effect of giant Kerr nonlinearity on group velocity of probe light in a six-level inverted-Y atomic system under electromagnetically induced transparency (EIT). In this scheme, a nonlinearity of the medium is enhanced greatly around in three spectral regions corresponding to transparent windows. As a consequence, such a giant Kerr nonlinearity of the medium changes significantly group index for probe light which can obstruct light slowdown. Moreover, this model shows also that the probe propagation can switch between subluminal and superluminal modes in three EIT windows by adjusting the parameters of the signal and coupling fields. Such analytical model is not only convenient for considering the influence of laser parameters on group velocity but is also easy used to fit the experimental results.