Systematic design of wideband slow light in ellipse-hole photonic crystal waveguides

Systematic design of wideband slow light in ellipse-hole photonic crystal waveguides
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椭圆孔光子晶体波导中宽带慢光的系统设计

DOI:
10.1364/josab.31.001011
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发表时间:
2014-05
影响因子:
1.9
通讯作者:
He Yu
He Yu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Tang Jian;Wang Tao;Li Xiaoming;Liu Bo;Wang Boyun;He Yu

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本研究提出一个系统的最佳化方法,以在椭圆孔光子晶体波导中产生具有大群折射率、宽频及低色散的慢光。通过改变第一行中椭圆孔的取向和第三行的纵向孔位置偏移,可以有效地调谐群折射率、带宽和色散。在±10%变化的恒定群折射率准则下,当群折射率近似为常数46、63、78和100时,在1550 nm附近的平坦带达到的相应带宽分别为13.5、9.4、7.8和6.1 nm。几乎恒定的组指数带宽产品为0.39,实现了所有情况下。利用二维时域有限差分法研究了脉冲相对时间展宽,证实了低色散慢光传输。
This study presents a systematic optimization procedure to generate slow light with large group index, wideband, and low dispersion in an ellipse-hole photonic crystal waveguide. The group index, bandwidth, and dispersion can be tuned efficiently by changing the orientation of the ellipse holes in the first row and a longitudinal hole position shift of the third row. Under a constant group index criterion of ±10% variation, the corresponding bandwidths of the flat band reach are 13.5, 9.4, 7.8, and 6.1 nm around 1550 nm when the group indices are approximately the constants 46, 63, 78, and 100, respectively. A nearly constant group index–bandwidth product of 0.39 was achieved for all cases. Low-dispersion slow-light propagation was confirmed by studying the relative temporal pulsewidth spreading with the two-dimensional finite difference time-domain method.
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