Modal fields of anisotropic channel waveguides
Modal fields of anisotropic channel waveguides
复制标题
各向异性通道波导的模态场
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
T. Giallorenzi
中科院分区：
文献类型：
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作者：
R. Steinberg;T. Giallorenzi
本文对矩形截面各向异性介质波导的模场和色散关系进行了近似分析。我们最初假设，介电张量是对角的引导和衬底区域的通道，在他们的界面处的一个步骤不连续。非对角元素的介电张量，然后通过耦合模理论容纳;连续横向变化的介电张量考虑到适应一个启发式技术，由于米勒。我们已经发现，各向异性可以起到解耦正交偏振分量的字段，导致在几乎线性偏振模式的许多情况下的实际利益。我们还考虑了两个这样的平行通道波导之间的能量耦合。
We present an approximate analysis of the model fields and dispersion relations of anisotropic dielectric waveguides of rectangular cross section. We initially assume that the dielectric tensor is diagonal in both the guiding and substrate regions of the channel, with a step discontinuity at their interface. Off-diagonal elements in the dielectric tensor are then accomodated by means of coupled mode theory; continuous transverse variation of the dielectric tensor is taken into account by adapting a heuristic technique due to Miller. We have found that the anisotropy may act to decouple orthogonally polarized components of the field, resulting in almost-linearly-polarized modes for many cases of practical interest. We have also considered the coupling of energy between two such channel waveguides running parallel to one another.