使用负折射的理想透镜在宏观距离上的次辐射和超辐射
Sub- and super-radiance over macroscopic distances using a perfect lens with negative refraction
摘要：
两个原子放在一个完美透镜的焦点上[J. B. Pendry，Phys. Ref. Lett. 85，3966（2000）]显示出即使在仅由自由空间衰减时间中的传播长度限制的宏观距离上也表现出完美的亚辐射和超辐射。如果形成完美透镜的左手材料在大于自然线宽的光谱范围内具有几乎恒定的负折射和消失的吸收，则两个焦点之间的延迟格林函数的虚部与相同空间位置处的虚部相同，并且原子经历马尔可夫动力学。从Veselago-Pendry透镜的格林函数出发，计算了集体衰变率和能级位移，并讨论了其局限性和潜在的应用。
英文摘要：
Two atoms put at the foci of a perfect lens [J.B. Pendry, Phys. Ref. Lett. 85, 3966 (2000)] are shown to exhibit perfect sub- and super-radiance even over macroscopic distances limited only by the propagation length in the free-space decay time. If the left-handed material forming the perfect lens has nearly constant negative refraction and vanishing absorption over a spectral range larger than the natural linewidth, the imaginary part of the retarded Greens-function between the two focal points is identical to the one at the same spatial position and the atoms undergo a Markovian dynamics. Collective decay rates and level shifts are calculated from the Greens-function of the Veselago-Pendry lens and limitation as well as potential applications are discussed.
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