Xu Yameng, Xiang Lei, Cassan Eric, Gao Dingshan, Zhang Xinliang
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China.
Appl Opt. 2013 Feb 20;52(6):1155-60. doi: 10.1364/AO.52.001155.
High normalized delay-bandwidth product (NDBP) and wideband slow light are achieved in an alternative row of ellipse-hole photonic crystal waveguide. Two different criteria of flat ratio are adopted. Under a constant group index criterion, a high NDBP of 0.446 with a group index of 42 and a bandwidth of 16.4 nm are obtained by plane wave expansion calculations, while under a low dispersion criterion, the NDBP, group index, and bandwidth come to 0.352, 41, 13.1 nm, respectively. Low dispersion slow light propagation is numerically demonstrated by studying the relative temporal pulse-width spreading with the two-dimensional finite-difference time-domain method. As a whole, the presented results give indications about the "ultimate" possible improvement of slow light waveguide metrics by using noncircular holes.
在交替排列的椭圆孔光子晶体波导中实现了高归一化延迟带宽积（NDBP）和宽带慢光。采用了两种不同的平坦率标准。在恒定群折射率标准下，通过平面波展开计算得到了群折射率为42、带宽为16.4 nm时高NDBP为0.446的结果，而在低色散标准下，NDBP、群折射率和带宽分别为0.352、41和13.1 nm。通过用二维时域有限差分法研究相对时间脉冲宽度展宽，对低色散慢光传播进行了数值演示。总体而言，所呈现的结果表明了使用非圆形孔对慢光波导指标进行“最终”可能改进的情况。
