Chinese Optics Letters, 2008, 6 (2): 0283, Published Online: Mar. 5, 2008  

Influence of dielectric microcavity on the spontaneous emission rate of atom: a perspective on the closed-orbit theory of photons Download: 635次

Author Affiliations
College of Physics and Electronics, Shandong Normal University, Ji’nan 250014
Abstract
The formulas of the quantum electrodynamics have been applied to calculate the spontaneous emission rate of excited atom in dielectric microcavity. The results exhibit damping oscillating patterns which depend sensitively on the scaling parameter and geometrical structure. Compared with the case that the emitting atom is immersed in dielectric, the spontaneous emission rate is depressed obviously and the center or the mean value of the oscillations is intimately related to the real refractive index of the local position where the atom is. In order to explain this phenomenon, we utilize the closed-orbit theory to deal with the classical trajectories of the emitted photon, and extract the corresponding frequencies of the oscillations by Fourier transform. It is found that the oscillations can be represented in terms of the closed-orbits of the photon motion constrained in dielectric microcavity, thus providing another perspective on the spontaneous emission of atom sandwiched by dielectric slabs.
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[22] <摘 要>利用腔量子电动力学公式计算了对称介质夹层微腔内激发态原子的自发辐射率。其结果呈现阻尼振荡的形式,并敏感的依赖于标度参数及体系的空间结构。与浸于电介质内原子的自发辐射率相比,这里的值明显偏低,且振荡的中心或原子自发辐射率的的平均值与所处介质的折射率密切相关。为了解释这种振荡现象,用闭合轨道理论来处理光子的经典运动,并通过傅立叶变换抽取相应的振荡频率。发现该性质可用光子的闭合轨道理论来描述,这也为理解介质夹层微腔内激发态原子自发辐射提供了新的方法。

Shubao Wang, Xueyou Xu, Hongyun Li, Zhengmao Jia, Shenglu Lin. Influence of dielectric microcavity on the spontaneous emission rate of atom: a perspective on the closed-orbit theory of photons[J]. Chinese Optics Letters, 2008, 6(2): 0283.

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