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Evaluation of diffraction loss in prism light guides by finite-difference time-domain field modeling

机译：时域有限差分法估算棱镜光导中的衍射损耗

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摘要

Prism light guides are hollow dielectric tubes that use prismatic facets to guide light by means of total internal reflection. An unresolved problem has been to determine the magnitude of loss caused by diffraction in prism Light guides. Neither experimental measurement nor an analytical solution has yet been achieved, so we attacked the problem numerically, in two steps. First, we found a way to represent such a transitionally invariant three-dimensional system as an equivalent two-dimensional problem. Second, we employed the finite-difference time-domain algorithm, with periodic boundary conditions, to yield a computation problem of manageable size. We found that the diffraction-induced transmissivity of a prism light guide wall is of the order of the wavelength divided by the prism size-a result that has encouraging practical implications. (C) 1998 Optical Society of America. [References: 9]
机译：棱镜光导是中空的介电管，它使用棱形小平面通过全内反射来导光。尚未解决的问题是确定由棱镜光导中的衍射引起的损耗量。实验测量和解析解决方案都尚未实现，因此我们分两步从数字上解决了这个问题。首先，我们找到了一种将这种过渡不变的三维系统表示为等效的二维问题的方法。其次，我们采用具有周期性边界条件的有限差分时域算法来产生可管理大小的计算问题。我们发现，棱镜导光壁的衍射感应透射率约为波长除以棱镜尺寸的结果，这具有令人鼓舞的实际意义。 （C）1998年美国眼镜学会。 [参考：9]

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