Hou Jin, Wu Huaming, Citrin D S, Mo Wenqin, Gao Dingshan, Zhou Zhiping
State Key Laboratory on Advanced Optical Communication Systems and Networks, Peking University, Beijing 10087, People's Republic of China.
Opt Express. 2010 May 10;18(10):10567-80. doi: 10.1364/OE.18.010567.
Wideband dispersion-free slow light in chirped-slot photonic-crystal coupled waveguides is proposed and theoretically investigated in detail. By systematically analyzing the dependence of band shape on various structure parameters, unique inflection points in the key photonic band with approximate zero group velocity can be obtained in an optimized slot photonic-crystal coupled waveguide. By simply chirping the widths of the photonic-crystal waveguides in the optimized structure, wideband (up to 20 nm) slow-light with optical confinement in the low dielectric slot is demonstrated numerically with relative temporal pulse-width spreading well below 8% as obtained from two-dimensional finite-difference time-domain simulations. The wideband slow-light operation of the proposed structures would offer significant potential for novel compact high-speed optical-signal-processing devices in silicon-based systems.
提出了啁啾槽光子晶体耦合波导中的宽带无色散慢光，并进行了详细的理论研究。通过系统分析能带形状对各种结构参数的依赖性，在优化的槽光子晶体耦合波导中，可以在关键光子带中获得具有近似零群速度的独特拐点。通过简单地对优化结构中的光子晶体波导宽度进行啁啾，从二维时域有限差分模拟中获得的相对时间脉冲宽度展宽远低于8%，从而在低介电常数槽中实现了具有光限制的宽带（高达20nm）慢光。所提出结构的宽带慢光操作将为硅基系统中的新型紧凑型高速光信号处理设备提供巨大潜力。
