The phenomenon was explained with tunneling theory and flat band model. 对于上述现象用隧穿理论以及直带模型进行了解释。
First we investigate a simple line defect photonic crystal waveguide with the same cavities, and achieve an extremely flat band, satisfying both the small group velocity and vanishing GVD. 本章首先考察了一种结构较为简单的单一谐振腔波导。通过对其能带的计算与分析,得到了一条极其平坦的色散曲线,满足群速度和GVD都同时接近于零。
The valence band maximum is a flat band; whereas the conduction band minimum is a parabolic band. 能带中价带顶是一条平坦的能带,而导带底为具有抛物线形状的能带。
Also it shows that the larger band width with flat band can be obtained. 同时,计算结果还表明可以获得比较平坦的较大带宽。
By using the same method, we obtain a flat band photonic crystal waveguide which can support both TE and TM modes slow light propagation, and the two polarizations have the same slow light frequency region. 7. 同时通过此方法得到另一种光子晶体慢光波导结构能同时支持TE和TM模慢光传播,且两种模式的慢光区域在同一频带范围。