Temnov Vasily V, Woggon Ulrike
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Opt Express. 2009 Mar 30;17(7):5774-82. doi: 10.1364/oe.17.005774.
The second-order photon correlation function g((2))(tau) of photons emitted by a continuously pumped ensemble of N two-level systems coupled to a single-mode optical cavity well below the lasing threshold is investigated theoretically. A giant photon bunching is found for N < 10 emitters as the microscopic counterpart of spontaneous emission noise driven quasi-periodic superradiant pulse sequences in macroscopic systems of large numbers of emitters N >> 1. The phenomenon of giant photon bunching is preserved even for N = 2 and can be explained by the cooperative evolution via dark and bright two-atom states resulting into emission of superradiant photon pairs. The sensitivity of g((2)) to microscopic dephasing processes and resonance frequency detuning opens the door for photon bunching spectroscopy.
理论上研究了与单模光学腔耦合的N个二能级系统连续泵浦系综发射光子的二阶光子关联函数g((2))(τ)，该光学腔远低于激光阈值。当N < 10个发射体时，发现了巨大的光子聚束现象，这是大量发射体N >> 1的宏观系统中自发发射噪声驱动的准周期超辐射脉冲序列的微观对应物。即使对于N = 2，巨大光子聚束现象也依然存在，并且可以通过经由暗态和亮态双原子态的协同演化导致超辐射光子对的发射来解释。g((2))对微观退相过程和共振频率失谐的敏感性为光子聚束光谱学打开了大门。
