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Comparison of the behavior of a subwavelength diffractive lens in TE and TM polarization allowing some nonstandard functions

机译:亚波长衍射透镜在TE和TM偏振下的行为比较,允许某些非标准功能

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摘要

This Letter introduces and discusses a difference in the behavior of a cylindrical diffractive lens encoded with subwavelength structures illuminated with monochromatic coherent light in the cases of TE and TM polarization. The effective medium theory is used to model with new binary phase function the diffractive lens. A new algorithm combines the finite-difference time domain for the propagation in the near field and the radiation spectrum method for the propagation in the far field. We observe the existence in the TM polarization of a second spot at half the distance of the focal length not predictable by scalar theory.
机译:这封信介绍并讨论了在TE和TM偏振情况下,用单色相干光照射的亚波长结构编码的圆柱衍射透镜的性能差异。有效介质理论用于对具有新的二进制相位函数的衍射透镜建模。一种新的算法将有限差分时域用于近场传播和将辐射谱方法用于远场传播。我们观察到第二个光斑在TM偏振中存在于标距理论无法预测的焦距距离的一半处。

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