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arXiv 1201.6004physics.optics
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部分相干光对小粒子的光学力

Optical forces on small particles from partially coherent light

Juan Miguel Auñón, Manuel Nieto-Vesperinas

摘要:

本文提出了一个关于平稳遍历的部分相干光场对偶极粒子的光学力的理论。我们通过严格的分析表明,系综平均电磁力给出的相干张量的空间变量对角元素的部分梯度。此外,通过遵循这个结果,我们描述了这个力的保守和非保守分量。此外,我们还根据光在衍射面上的相干函数建立了光力的传播规律。这使我们能够评估的影响的程度上的力分量的相干性,通过使用的原型配置的杨氏双孔衍射图案,所以经常采用的波的相干性的特征。

英文摘要:

We put forward a theory on the optical force exerted upon a dipolar particle by a stationary and ergodic partially coherent light field. We show through a rigorous analysis that the ensemble averaged electromagnetic force is given in terms of a partial gradient of the space variable diagonal elements of the coherence tensor. Further, by following this result we characterize the conservative and non-conservative components of this force. In addition, we establish the propagation law for the optical force in terms of the coherence function of light at a diffraction plane. This permits us to evaluate the effect of the degree of coherence on the force components by using the archetypical configuration of Young's two apertures diffraction pattern, so often employed to characterize coherence of waves.

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