采用时域有限差分方法求出了麦克斯韦-布洛赫方程的孤子解,数值模拟了由共振吸收原子按布拉格结构所排列而形成的″主动光子晶体″中产生″慢光子″和″静止光子″的方法.结果证明,如果使入射脉冲面积等于一个合适的值,无须对介质作任何初始激发,具有一定包络形状的脉冲可以在共振光子带隙结构中演化为空间局域化的振荡间隙孤子或静止间隙孤子.此外,理论上也模拟了间隙孤子分裂的情况.我们研究的结果证明,多个间隙孤子可以连续地自发局域化于同一结构中,因此,有效的光能就能以原子相干态的形式在共振光子带隙结构中存储,响应时间为亚皮秒的光子操控将有可能实现.

A practical method of slowing and stopping an incident ultrashort light pulse with a resonantly absorbing Bragg reflector is demonstrated numerically. It is shown that an incident laser pulse with suitable pulse area evolves from a given pulse waveform into a stable, spatially-localized oscillating or standing gap soliton. It is proven that multiple gap solitons can be simultaneously spatially localized, resulting in efficient optical energy conversion and storage in the resonantly absorbing Bragg structure as atomically coherent states.