Flat Band Slow Light With High Coupling Efficiency in One-Dimensional Grating Waveguides

被引：17
作者：
Bao, Changjing [1 ]
Hou, Jin [1 ,2 ]
Wu, Huaming [1 ,3 ]
Cassan, Eric [4 ]
Chen, Lin [1 ]
Gao, Dingshan [1 ]
Zhang, Xinliang [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Coll Optoelect Sci & Engn, Wuhan 430074, Hubei, Peoples R China
[2] S Cent Univ Nationalities, Dept Elect & Informat Engn, Wuhan 430074, Peoples R China
[3] Nanchang Hangkong Univ, Sch Measuring & Opt Engn, Minist Educ, Key Lab Nondestruct Test, Nanchang 330063, Peoples R China
[4] Univ Paris 11, Inst Elect Fondamentale, UMR CNRS 8622, F-91405 Orsay, France
来源：
IEEE PHOTONICS TECHNOLOGY LETTERS | 2012年 / 24卷 / 01期
关键词：
Dispersion; grating; slow light; waveguide;
D O I：
10.1109/LPT.2011.2171935
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Flat band slow light with high coupling efficiency is achieved in a simple one-dimensional grating waveguide. An ideal flat band indicating slow light with group index of 18.3 and bandwidth of 10.3 nm is obtained by plane wave expansion calculation. This result is also verified by inputting a Gaussian pulse into a 48.7-mu m-long waveguide in a finite-difference time-domain simulation, in which optical pulse delay of 2.85 ps and group index of 17.54 can be observed. Meanwhile, by introducing a step taper, the coupling efficiency could be improved remarkably from below 20% for butt coupling to 70%. The proposed structure is an ideal candidate for wideband and compact low loss slow light delay lines or optical buffers in on-chip signal processing.
引用
收藏
页码：7 / 9
页数：3
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