Slow light with large group index-bandwidth product in ellipse-hole photonic crystal waveguides.
Slow light with large group index-bandwidth product in ellipse-hole photonic crystal waveguides.
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DOI：
10.1364/ao.54.001543
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发表时间：
2015-02
期刊：
影响因子：
1.9
通讯作者：
Xu Han;Tao Wang;Jian Tang;Bo Liu;Boyun Wang;Yu He;Youjiang Zhu
中科院分区：
文献类型：
--
作者：
Xu Han;Tao Wang;Jian Tang;Bo Liu;Boyun Wang;Yu He;Youjiang Zhu
在这项研究中，我们提出了一种新型慢光光子晶体波导结构，以实现低色散的宽带慢光。该波导基于三角晶格椭圆孔光子晶体，只需选择性地改变与线缺陷相邻的孔的位置即可。在±10%变化的恒定群指数标准下，当群指数接近常数54、69和80时，它们对应的平带带宽在1550 nm附近分别达到12.7、10.0和8.6 nm。所有情况下都实现了几乎恒定的大群折射率带宽乘积 0.44。通过二维时域有限差分法研究相对时间脉宽扩展，证实了低色散慢光传播。
In this study, we propose a new type of slow light photonic crystal waveguide structure to achieve wideband slow light with low dispersion. The waveguide is based on a triangular lattice ellipse-hole photonic crystal imposed simply by a selective altering of the locations of the holes adjacent to the line defect. Under a constant group index criterion of ±10% variation, when group indices are nearly constants of 54, 69, and 80, their corresponding bandwidths of the flat band reach 12.7, 10.0, and 8.6 nm around 1550 nm, respectively. A nearly constant large group index-bandwidth product of 0.44 is achieved for all cases. Low dispersion slow light propagation is confirmed by studying the relative temporal pulse-width spreading with the two-dimensional finite-difference time-domain method.