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首页> 外文期刊>Optical engineering >All-angle self-collimation in two-dimensional square array photonic crystals based on index contrast tailoring
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All-angle self-collimation in two-dimensional square array photonic crystals based on index contrast tailoring

机译：基于折射率对比裁剪的二维方阵光子晶体全角度自准直

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摘要

A comprehensive study has been performed to achieve all-angle self-collimation in basic two-dimen-sional square array photonic crystals with cylindrical scatterers. Based on plane wave expansion and finite difference time domain analysis for both rod- and hole-type structures, we report on all-angle self-collimation (SC) in the first band of the structure, which results in loss suppression due to out-of-plane scatterings. A lower threshold for index contrast has been obtained to achieve all-angle SC, which offers more design flexibility regarding structural parameters. Furthermore, it has been shown that a minimum and maximum coupling efficiency enhancement of ~40% and 80% can be achieved for the proposed structure, respectively, by introducing a row of scatterers with proper radius at the input and the output air/photonic crystal interfaces.
机译：已经进行了全面的研究，以在具有圆柱状散射体的基本二维正方形阵列光子晶体中实现全角度自准直。基于平面波扩展以及杆状和孔状结构的时域有限差分时域分析，我们报告了结构第一频带中的全角度自准直（SC），这导致了由于外向形而导致的损耗抑制。平面外散射。为了实现全角度SC，已经获得了较低的折射率对比阈值，这为结构参数提供了更多的设计灵活性。此外，已经表明，通过在输入和输出空气/光子晶体处引入适当半径的一排散射体，对于所提出的结构，分别可以实现约40％和80％的最小和最大耦合效率增强。接口。

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