Wideband slow light and dispersion control in oblique lattice photonic crystal waveguides.
Wideband slow light and dispersion control in oblique lattice photonic crystal waveguides.
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DOI：
10.1364/oe.18.005707
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发表时间：
2010-03
期刊：
影响因子：
3.8
通讯作者：
F. Leng;W. Liang;B. Liu;Tongbiao Wang;He-Zhou Wang
中科院分区：
文献类型：
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作者：
F. Leng;W. Liang;B. Liu;Tongbiao Wang;He-Zhou Wang
我们发现，在光子晶体线缺陷波导中，基元晶格矢量之间的夹角对慢光的带宽和色散有明显的影响。当群折射率的涨落严格限制在± 1%范围内时，基本晶格矢量夹角略大于60 °的斜晶格结构比三角晶格结构具有更宽的平带慢光可用带宽。例如，对于66度角，对于几种不同的结构，可用带宽从20%增加到68%。对于相同的角度和群速度± 10%的变化，当群指数几乎为常数30、48.5、80和130时，它们对应的平带带宽在1550 nm附近分别达到20 nm、11.8 nm、7.3 nm和3.9 nm。带宽的增加与反交叉点向较小波数方向移动有关。
We find that the angle between elementary lattice vectors obviously affects the bandwidth and dispersion of slow light in photonic crystal line-defect waveguides. When the fluctuation of group index is strictly limited in a +/-1% range, the oblique lattice structures with the angle between elementary lattice vectors slightly larger than 60 degrees have broader available bandwidth of flat band slow light than triangular lattice structures. For example, for the angle 66 degrees , there are increases of the available bandwidth from 20% to 68% for several different structures. For the same angle and a +/-10% variation in group velocity, when group indices are nearly constants of 30, 48.5, 80 and 130, their corresponding bandwidths of flat band reach 20 nm, 11.8 nm, 7.3 nm and 3.9 nm around 1550 nm, respectively. The increasing of bandwidth is related to the shift of the anticrossing point towards smaller wave numbers.