光子晶体中二能级原子的自发辐射  

Spontaneous Emission from a Two-level Atom in Photonic Crystals

作　　者：周仁龙[1] 彭景翠[1] 李宏建[1] 张高明[1] 翦之渐[1] 夏辉[1] 王健雄[1] 林峰[1] 

机构地区：[1]湖南大学光电子材料研究所,湖南长沙410082

出　　处：《光谱学与光谱分析》2003年第4期657-661,共5页Spectroscopy and Spectral Analysis

基　　金：湖南省自然科学基金 (No:98JJY2 0 4 7);湖南大学科学基金重点资助项目

摘　　要：研究光子晶体中二能级原子的自发辐射。由于光的局域化以及缀饰态之间的量子相互作用 ,由局域场、传输场、弥散场组成的原子的辐射场发生变化 :随着激发态能级由禁带移往通带 ,发现局域场中的能量通过弥散场向传输场转移。当局域场和传输场共存时 ,激发态能级上的原子布居数的演化具有准振荡行为 ;当局域场和传输场不共存时 ,原子布居数的演化不具有准振荡行为。另外 ,激发态能级上的稳态原子布居数也发生改变。这些性质不仅依赖于原子的激发态能级ω1与光子频率能带边缘ωc 的相对位置δ,同时也依赖于光子晶体中带边缘的光子态密度 ρ(ωk) (或带边光滑参数ε)。Spontaneous emission from a two-level atom embedded in photonic crystals was investigated in this paper. Due to the photon localization and the quantum interference between the two dressed states, some changes in the radiation field take place: when the excited level moves from the gap to the band, the energy of the localized field is transferred to the propagating field through the diffusion field. If the localized field and the propagating field could coexist, the population evolution in the excited level would exhibit quasi-oscillation behavior. If they could not coexist, there would be no quasi-oscillation. The steady-state trapped atom population in the excited level is changed also. All these characteristics depend not only on the relative position delta of the excited level omega(1) with respect to the band-edge omega(c) but also on the photon density of states rho(omega(k)) (or the band-edge smoothing parameter epsilon) near the band edge.

关 键 词：光子晶体 二能级原子 自发辐射 光子态密度 量子光学 

分 类 号：O431.2[机械工程—光学工程]