Two-Atom Cooperative Emission in a Microcavity with Output Coupling

用量子力学方法研究了平面微腔中两个初始激发原子的协同辐射。利用扩展到整个腔体空间的精确电磁模式函数，我们得到了一个包含相应延迟时间的延迟微分方程。在强耦合区域的数值分析表明，小原子间距离时有很强的协同效应。值得注意的是，随着平面微腔特征模尺寸的增加，协同效应逐渐减弱。在这方面，研究了对称和反对称中间态在自由空间中两个初始激发原子的协同发射中的作用，发现这两个态都对辐射衰变有贡献，而其中任何一个态的缺失都会导致长期衰变。以罗丹明6G染料溶液为发射介质，倍频激光为泵浦源，对平面微腔模式下的双分子发射进行了初步的实验研究。观察到了两个分子发射事件的特征。

Cooperative emission by two initially excite atoms in a planar microcavity is investigated quantum-mechanically. Using exact electro-magnetic mode functions extending over whole space that includes the cavity, we obtained a delay-differential equation containing relevant delay times. Numerical analysis in the strong-coupling regime revealed strong cooperative effects for small inter-atomic distances. Notably, the cooperative effects diminished for distances around the characteristic mode size of the planar microcavity. In this connection, the role of symmetric and anti-symmetric intermediate states in cooperative emission by two initially excited atoms in free space was investigated to find that both states contribute to the radiative decay and lack of either one results in prolonged decay. Preliminary experiments on observing two molecule emission under the mode defining property of a planar microcavity was performed using a Rhodamine6G dye solution as the emitting medium and a SHG-YAG laser as the pump source. Signatures of two molecule emission events were observed.