Polarization-selective waveguide bends in a photonic crystal structure with layered square symmetry
Polarization-selective waveguide bends in a photonic crystal structure with layered square symmetry
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层状方形对称光子晶体结构中的偏振选择性波导弯曲
DOI：
10.1063/1.1815046
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发表时间：
2004
影响因子：
3.2
通讯作者：
J. Joannopoulos
中科院分区：
文献类型：
--
作者：
D. Roundy;E. Lidorikis;J. Joannopoulos
我们展示了在最近提出的具有层状方对称的光子晶体中的单模水平和垂直波导。垂直波导支持两个简并的偏振，因此可以根据其偏振将光选择性地引导到取向为90°的水平波导中。我们计算了从水平波导到水平波导和从水平波导到垂直波导的90°弯曲的传输。在水平-水平弯曲的情况下，我们显示了简单(“零”曲率半径)弯曲的透过率为83%，而对于通过将一根杆从弯曲的内角移动到弯曲的外角进行了优化的弯曲，峰值透过率为100%。对于垂直到水平的弯曲，我们发现允许的偏振透过率为95%，但带宽比优化的水平弯曲的情况小得多。
We demonstrate single-mode horizontal and vertical waveguides in a recently proposed photonic crystal having layered square symmetry. The vertical waveguide supports two degenerate polarizations, and thus light can be selectively steered into horizontal waveguides oriented at 90° based on its polarization. We calculate the transmission of 90° bends, both from horizontal waveguide to horizontal waveguide and from horizontal waveguide to vertical waveguide. In the case of the horizontal-horizontal bend, we show a transmission of 83% for a simple (“zero” radius of curvature) bend, and a peak transmission of 100% for a bend which has been optimized by moving one rod from the inner corner to the outer corner of the bend. For the vertical to horizontal bend, we find a transmission of 95% for the allowed polarization, but with a much smaller bandwidth than in the case of the optimized horizontal bend.