Anisotropic dielectric waveguides
Anisotropic dielectric waveguides
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各向异性介质波导
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
M. Fejer
中科院分区：
文献类型：
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作者：
M. Lu;M. Fejer
当存在正交偏振的简并辐射模式时，已知各向异性波导的导模是泄漏的。当介电张量的主轴与波导轴不对齐时，这些损耗可能非常大。我们使用对弱引导和弱各向异性有效的微扰展开来计算具有任意方向的介电张量的波导中的泄漏率，获得了相对简单的损耗表达式，并将其应用于从具有阶跃和渐变折射率分布的平面和光纤波导绘制的模型情况。讨论了损耗随轮廓高度和各向异性的变化，包括强不对称平面波导的实际情况。
The guided modes of anisotropic waveguides are known to be leaky when degenerate radiation modes of the orthogonal polarization exist. These losses can be quite large when the principal axes of the dielectric tensor are not aligned with the waveguide axis. We calculate the leakage rate in waveguides that have arbitrarily oriented dielectric tensors, using a perturbation expansion that is valid for weak guidance and weak anisotropy A relatively simple expression for the loss is obtained and is applied to model cases drawn from planar and fiber waveguides with step- and graded-index profiles. The scaling of the loss with profile height and anisotropy is discussed, including the practical case of strongly asymmetric planar waveguides.