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arXiv 0706.0477cond-mat.other
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超冷原子气体中轨道为angular momentum的慢光的偏振旋转

Polarisation rotation of slow light with orbital angular momentum in ultracold atomic gases

J. Ruseckas, G. Juzeliunas, P. Ohberg, S. M. Barnett

摘要:

研究了具有轨道角动量的慢光在运动原子介质中的传播。我们导出了一个普遍的运动方程,并将其应用于分析具有OAM的慢光在旋转介质(如涡旋晶格)中的传播。我们已经表明,慢光的OAM表现在线性偏振光的偏振平面的旋转。为了提取纯旋转相移,我们建议通过具有相反OAM的两个连续光束测量偏振平面旋转角度的差异。微分角$Δα_{\ell}$与介质的旋转频率$ω_{\mathrm{rot}}$和光的缠绕数$\ell$成正比,与光的群速度成反比。对于慢光,角度$Δα_{\ell}$应足够大,以便于检测。该效应可用作测量介质旋转频率$ω_{\mathrm{rot}}$的工具。

英文摘要:

We consider the propagation of slow light with an orbital angular momentum (OAM) in a moving atomic medium. We have derived a general equation of motion and applied it in analysing propagation of slow light with an OAM in a rotating medium, such as a vortex lattice. We have shown that the OAM of slow light manifests itself in a rotation of the polarisation plane of linearly polarised light. To extract a pure rotational phase shift, we suggest to measure a difference in the angle of the polarisation plane rotation by two consecutive light beams with opposite OAM. The differential angle $Δα_{\ell}$ is proportional to the rotation frequency of the medium $ω_{\mathrm{rot}}$ and the winding number $\ell$ of light, and is inversely proportional to the group velocity of light. For slow light the angle $Δα_{\ell}$ should be large enough to be detectable. The effect can be used as a tool for measuring the rotation frequency $ω_{\mathrm{rot}}$ of the medium.

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