驱动场作用下光子晶体中的光场-原子束缚态

光子晶体中光子带隙的存在导致光场 -原子束缚态的存在。该束缚态的性质与镶嵌在光子晶体中原子的个数、原子的能级结构、能级相对光子带隙边缘的位置以及有无驱动场有关。利用求束缚态本征波函数的方法 ,讨论了光子晶体中一个三能级原子在相干场驱动下 ,由于光和原子之间的相互作用产生束缚态的性质。分析了在各种束缚态下原子各能级的粒子数布居随驱动场拉比频率的变化。分析结果表明 ,系统中存在多重束缚态 ,而且与上能级相对光子带隙的位置有关 ,当上能级位于带隙外时 ,只有一个本征束缚态 ,且原子几乎不能停留在上能级 ;当上能级在带隙内时 ,有两个本征束缚态 ,且两个本征束缚态的性质截然不同 ,原子各能级的粒子数布居随驱动场参数变化很明显

Trapped Atom-Field State for an Atom Driven by Coherent Field in a Photonic Crystal

The forbidden band in a photonic crystal leads to the existence of trapped atom-field state whose properties depend on the followings: the number of atoms embedded in a photonic crystal,the energy level structure of atom,the relative position between the level and the edge of band gap and the existence of driving field.By using the method of searching for the eigenstate of the trapped state,that the trapped atom-field state for a three-level atom with driving field in a photonic crystal exists due to the interference between atom and field, was discussed. That the trapped states and the population in various levels can be influenced by the strength and the Rabi frequency of the driving field was proved. That more than one trapped state exist and they depend on the position of the upper level also were proved. Analysis show that there is only one eigenstate when the upper energy level locates outside the band gap, and atom hardly stays in upper energy level; there are two eigenstates when the upper energy level locates in the band gap, but the properties of the two are quite different each to other. The distribution of particle number on every energy level varies obviously as the driving field parameter varies.