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arXiv physics/9909064physics.opticsphysics.bio-ph
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光镊理论

Theory of Optical Tweezers

P. A. Maia Neto, H. M. Nussenzveig

摘要:

我们推导出一个分波(米氏)展开的轴向力施加在一个透明的球体上的激光束聚焦通过一个高数值孔径物镜。结果保持整个范围内的实际应用的兴趣。的射线光学极限示出遵循从米氏膨胀的尺寸平均。数值曲线图显示了大的偏差,从射线光学附近的焦点区域和振荡行为(解释在一个简单的干涉仪图片)的力作为尺寸参数的函数。现有的实验数据有利于本模型比以前的。

英文摘要:

We derive a partial-wave (Mie) expansion of the axial force exerted on a transparent sphere by a laser beam focused through a high numerical aperture objective. The results hold throughout the range of interest for practical applications. The ray optics limit is shown to follow from the Mie expansion by size averaging. Numerical plots show large deviations from ray optics near the focal region and oscillatory behavior (explained in terms of a simple interferometer picture) of the force as a function of the size parameter. Available experimental data favor the present model over previous ones.

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