特殊Non-Markovian系统中多能级原子的动力学特性研究

中文摘要

Non-Markovian 系统中存在的自发辐射抑制和特殊的荧光特性等在无反转激光和量子信息等领域具有潜在的应用。基于多能级原子结构的多样性和系统的特殊态密度，系统的研究原子与光子晶体以及衰减腔等特殊Non-Markovian 系统的相互作用，预期将会产生若干独特的物理现象和规律。本研究突破已有研究的局限性，将分解算符引入三能级系统，同时考虑两个跃迁均耦合到相同的光子晶体的情况，采用不同色散模型，研究三能级Lambda 型原子的自发辐射动力学行为。研究衰减腔中三能级Lambda 型原子的自发辐射稳态行为。在此基础上，尝试几种特殊结构光子晶体中光子局域态密度的严格计算，进而严格计算光子晶体中三能级Lambda 型原子的自发辐射特性。分别研究一个或两个外加驱动对光子晶体中四能级原子自发辐射的影响。这些研究有助于深入理解光子晶体与衰减腔这两类特殊的Non-Markovian 系统中的原子与分子的动力学行为。

英文摘要

The inhibited spontaneous emission and properties of fluorescence in Non-Markovian.system have potential application in the field of laser without inversion and quantum.information. Based on the variety of structure of multi-level atom and special density.of states of system, many special phenomena and law will appear through investigating.the interaction between the atom and photonic band-gap reservoir (cavity). We break the.limitation of previous investigations and study the decay dynamics of three-level Lambda.system by introducing resolvent operator considering both transition coupling to the.same modified reservoir. In addition, we investigate the steady state behaviour of the.spontaneous emission of the three-level lambda atom in damped cavity. Furthermore, we.will try to calculate exactly the photonic local density of states for photonic crystal.of several special structures. By using the density of states we can get the exact decay.dynamics of the atom. In addition, we will discuss the influence of external driving.field on spontaneous emission of multi-level atom in photonic crystal. All these.investigation will play an important role to understand deeply the dynamic behaviour of.atoms and moleculars in photonic crystals or cavitys