Enhancement of the nonlinearity via interacting dark resonances

Enhancement of the nonlinearity via interacting dark resonances

A scheme for large enhancement of the third-order nonlinearity in a four-level system with double dark resonances is proposed. We obtain an analytical expression for the linear susceptibility and nonlinear susceptibility of a weak probe field and show that the properties of double electromagneticall...

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Hauptverfasser: Yan Xiang'an, Wang Li-qiang
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electromagnetically induced transparency
nonlinear optics
the third-order nonlinearity
tripod atomic system
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Wang Li-qiang
description A scheme for large enhancement of the third-order nonlinearity in a four-level system with double dark resonances is proposed. We obtain an analytical expression for the linear susceptibility and nonlinear susceptibility of a weak probe field and show that the properties of double electromagnetically induced transparency and the Kerr nonlinearity can be modified significantly by changing the ratio of the two coupling fields. A physical understanding of our numerical results using the dressed-state approach is presented. The obtained large nonlinearity with vanishing absorption can be used to generate optical solitons, polarization phase gates and optical Kerr shutters.
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subjects electromagnetically induced transparency
nonlinear optics
the third-order nonlinearity
tripod atomic system
title Enhancement of the nonlinearity via interacting dark resonances
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