Wideband slow light with improved NDBP values in asymmetric photonic crystal waveguides

被引：0

作者：

Liu, Bo ^{[1
]}

Wang, Boyun ^{[1
]}

Wang, Tao ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China

来源：

PHOTONIC CRYSTAL MATERIALS AND DEVICES XI | 2014年 / 9127卷

关键词：

LOW GROUP-VELOCITY; ORDER-DISPERSION;

D O I：

10.1117/12.2050272

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

New procedure of designing slotted photonic crystal waveguides (SPCW) is proposed to achieve slow light with improved normalized delay-bandwidth product (NDBP) and low group velocity dispersion, which is suitable for both the W1 defect mode and the slot mode. The lateral symmetry of the waveguide in our study is broken by shifting the air holes periodically along the slot axis. The conversion of the "flat band" from band-up slow light to band-down slow light is achieved for W1 defect mode. The group index curves of W1 mode change from U-like to step-like and the group index of 47, 67 and 130 are obtained with the bandwidth over 7.2, 4.8, and 2.3nm around 1550nm, respectively. We also obtain the group index of 42, 55, and 108 for the slot mode with the bandwidth over 6.2, 5.6, and 2.2nm. Then the low dispersion slow light propagation is numerically demonstrated by the finite-difference time-domain method.

引用

页数：12

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