垂直入射时无限长分层柱电磁散射的改进算法及应用

结合非均匀球粒子对平面波散射的散射场计算的改进算法,提出了平面波垂直入射无限长分层圆柱散射场快速稳定而有效的改进电磁散射算法。与已有算法相比,改进算法所能计算的无限长非均匀介质圆柱的尺寸参量突破10000,计算层数达到106,并且计算时间很短,最多仅为几秒。该算法可以用于不同的波段以及不同领域的任意无耗或吸收无限长圆柱体散射场的计算。最后将该算法应用于梯度折射率聚合物光纤(GI-POF)散射特性的研究,为非接触、在线测量聚合物光纤折射率分布提供了理论依据。

Improved Algorithm of Electromagnetic Scattering by a Multilayered Cylinder of Infinite Length for Normal Incidence and Its Application

On the basis of the improved algorithm for electromagnetic scattering of plane waves by multilayered spheres,a stable,efficient numerical algorithm to compute the scattering coefficients of a multilayered cylinder of infinite length is proposed.Compared with previous algorithms,the computation for scattering field in the proposed one is extended to fairly large parameters,up to 10000 and 106 in number of layers,and the operating time is not more than several seconds.The algorithm can also be used for absorbing or nonabsorbing cylinders of infinite length in different wavebands and different fields.At last,the algorithm is used in the study on scattering of gradient refractive-index polymer optical fiber,which supplies theoretical base for non-intrusive on-line measurement of refractive index by light scattering.