Interaction of Gaussian beam with near-spherical particle: an analytic-numerical approach for assessing scattering and stresses
Interaction of Gaussian beam with near-spherical particle: an analytic-numerical approach for assessing scattering and stresses
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DOI：
10.1364/josaa.26.001814
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发表时间：
2009-08-01
影响因子：
1.9
通讯作者：
Guck, Jochen
中科院分区：
文献类型：
--
作者：
Boyde, Lars;Chalut, Kevin J.;Guck, Jochen
我们推导了一种直接的理论方法来确定单色激光入射到近球形介质粒子上的电磁场。光束形状系数是从径向激光场获得的，并以有限级数的形式表示，据我们所知，这种形式以前从未发表过。我们在球坐标下求解Maxwell方程的微扰方法使用了两种不同的技术来匹配边界条件：一种是针对低偏心率的小粒子的解析方法，另一种是针对较大的高深宽比的较大球体的改进点匹配方法。我们给出了施加在粒子上的内场和外场、散射强度和应力的结果。虽然我们的方法和其他方法一样精确，但我们的方法很容易在数值上实现，因此在实际应用中特别有用，例如，用于分析光学陷阱，如光学拉伸器。(C)2009年美国光学学会
We derive a straightforward theoretical method to determine the electromagnetic fields for the incidence of a monochromatic laser beam on a near-spherical dielectric particle. The beam-shape coefficients are obtained from the radial laser fields and expressed as a finite series in a form that has, to our knowledge, not been published before. Our perturbation approach to solve Maxwell's equations in spherical coordinates employs two alternative techniques to match the boundary conditions: an analytic approach for small particles with low eccentricity and an adapted point-matching method for larger spheroids with higher aspect ratios. We present results for the internal and external fields, scattering intensities, and stresses exerted on the particle. While similarly accurate as others, our approach is easily implemented numerically and thus particularly useful in praxis, e.g., for analyzing optical traps, such as the optical stretcher. (C) 2009 Optical Society of America