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Optics Communications

Phase dependence of cross-phase modulation in asymmetric quantum wells

Yihong Qi, Yueping Niu, Yang Xiang, Helin Wang, Shangqing Gong

Published Sep 23, 2010• 27 citations
Publisher
DOI
10.1016/j.optcom.2010.09.016

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Abstract We investigate the formation and propagation of the Thirring spatial optical solitons in asymmetric quantum wells (QWs). By virtue of the quantum interference effect, the cross-phase modulation (XPM) can be enhanced greatly while the self-phase modulation and linear absorption are well suppressed with proper system parameters. Diffraction of the probe fields can be well balanced by the enhanced XPM alone, which results in their stationary propagation and the formation of Thirring vector optical solitons. In comparison with traditional vector optical solitons, such Thirring spatial optical solitons generated in the QWs can be of various widths and peak powers, implying their more prospective applications in optical communications and optical information processing.
A theoretical investigation is carried out into the cross phase modulation (XPM) in an asymmetric double AlGaAs/GaAs quantum wells structure with a common continuum.It is found that, combining resonant tunneling-induced transparency and constructive interference in the third-order Kerr effect, a giant XPM can be achieved with vanishing linear and nonlinear absorptions, accompanied by the velocities of the probe and signal fields being matched.Furthermore, this giant XPM could induce a π-phase shift at a single-photon level which is favorable for the applications in two-qubit quantum logic gates.