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Optics Communications

Theoretical investigation of large Kerr nonlinearity at weak magnetic field intensities in molecular magnets

Jing Wu, Jibing Liu, Hong Li, Xin-You Lü, Anshou Zheng

Published Oct 31, 2011• 5 citations
Publisher
DOI
10.1016/j.optcom.2011.10.040

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A theoretical investigation of the effect of spontaneously generated coherence and the applied laser field intensity on the electromagnetically induced transparency and Kerr nonlinearity is carried out.It is found,with spontaneously generated coherence present,the Kerr nonlinearity can be clearly enhanced is carried out,and the maximal Kerr nonlinearity does not only enter the electromagnetically induced transparency window as the spontaneously generated coherence intensitifies,but also gets enhanced about 10 times with large SGC coefficients than that with no SGC effect.In addition,the enhanced Kerr nonlinearity can also be obtained by decreasing the ratio of the coupling field intensity to the control field intensity.
A theoretical investigation is carried out into the effect of applied coherent fields on electromagnetically induced transparency(EIT) and Kerr nonlinearity in the four-level Y-type energy atom system.It is found that the Absorption curve of the atom system changes from one EIT window to a gain interval which has two transparency points when the intensity of coupling field and pumping field changes from equality to inequality.The position of transparency points,the magnitude of gain value together with the width of gain interval are all closely connected with the changed Rabi frequency of applied fields.It is also found that Kerr nonlinearity is enhanced but accompanied by linear Absorption when applied fields are all weak and their relative intensity reduces.When the intensity of applied fields is enlarged,Kerr nonlinearity is enhanced significantly and its peak moves to the position of transparency point with the enlargement of their relative intensity.That is to say,giant Kerr nonlinearity accompanied by vanishing linear Absorption is obtained.Finally,we find that the effect of the intensity variation of the pumping field on the enhancement of Kerr nonlinearity is more remarkable than that of the coupling field.
We investigated control of optical bistability behavior based on the probe absorption and Kerr nonlinearity properties in a tripod-type degenerate four-level atom system under an external magnetic field. This excitation configuration can provide two transparent spectral regions on the probe absorption profile. It can be transitioned between the transparency and absorption regimes by turning on or off the magnetic field in different frequency domains. We can effortlessly transform one into two transparency windows, and vice versa, by modifying the intensity of the magnetic field. The investigations showed the enhancement of the Kerr nonlinearity around one/two-EIT windows, thereby forming one/two-channel optical bistability in these frequency regions. In addition, the coupling field intensity, the probe frequency detuning, and the atomic cooperation parameter have also significantly influenced the absorption spectrum, Kerr nonlinearity, and optical bistability. The proposed model has useful applications for storage and optical switching, and nonlinear logic gates in optical communications processing.