半无限大介质板夹层对空腔中原子自发辐射率的影响

EFFECTS OF THE SEMI-INFINITE DIELECTRIC SLABS CAVITY ON THE SPONTANEOUS EMISSION RATE OF ATOMS:A PERSPECTIVE ON THE CLOSED-ORBIT THEORY OF PHOTONS

研究了半无限大介质板夹层对空腔中激发态原子的自发辐射率的影响.引入标度变量,采用腔量子电动力学方法计算了原子的自发辐射率,并用闭合轨道理论对结果进行分析:由于介质界面的影响,光子经界面反射后返回到辐射原子上,并与出射的光子相干,辐射率呈现出拟周期的阻尼振荡;通过Fourier变换抽取振荡频率,每一频率对应一条光子经典轨迹的作用量,从而给出了夹层空腔对激发态原子自发辐射率的影响的新解释.

The formulas of the quantum electrodynamics are applied to calculate the spontaneous emission rate of high-excited atoms in a cavity sandwiched by two semi-infinite dielectric slabs.The results exhibit multiperiodic damping oscillations as the system scale is varied.In order to explain the behavior of oscillations,the closed-orbit theory has been extended to the classical geometric trajectories of emission photon,and the frequencies of the closed orbits of photons are extracted by Fourier transform.It agrees well with the frequencies component of the spontaneous emission rate.This paper gives another perspective on the spontaneous emission of atoms in the presence of environment.