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Calculation of the radiation trapping force for laser tweezers by use of generalized Lorenz-Mie theory. I. Localized model description of an on-axis tightly focused laser beam with spherical aberration

机译:使用广义的Lorenz-Mie理论计算激光镊子的辐射捕获力。一,同轴球面像差紧聚焦激光束的局部模型描述

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摘要

Calculation of the radiation trapping force in laser tweezers by use of generalized Lorenz-Mie theory requires knowledge of the shape coefficients of the incident laser beam. The localized version of these coefficients has been developed and justified only for a moderately focused Gaussian beam polarized in the x direction and traveling in the positive z direction. Here the localized model is extended to a beam tightly focused and truncated by a high-numerical-aperture lens, aberrated by its transmission through the wall of the sample cell, and incident upon a spherical particle whose center is on the beam axis. We also consider polarization of the beam in the y direction and propagation in the negative z direction to be able to describe circularly polarized beams and reflected beams.
机译:使用广义的Lorenz-Mie理论计算激光镊子中的辐射捕获力需要了解入射激光束的形状系数。仅针对在x方向偏振并在z正方向传播的中等聚焦的高斯光束,才开发并证明了这些系数的局部形式是正确的。在这里,局部化模型被扩展到光束,该光束被高数值孔径透镜紧密聚焦并被截断,由于其穿过样品池壁的传输而变差,并入射到中心在光束轴上的球形粒子上。我们还认为光束在y方向上的偏振和在负z方向上的传播能够描述圆偏振光束和反射光束。

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  • 来源
    《Applied optics》 |2004年第12期|共13页
  • 作者

    James A. Lock;

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  • 正文语种 eng
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