Spontaneous emission of a cesium atom near a nanofiber: Efficient coupling of light to guided modes
Spontaneous emission of a cesium atom near a nanofiber: Efficient coupling of light to guided modes
复制标题
DOI：
10.1103/physreva.72.032509
复制
发表时间：
2005-09-01
影响因子：
2.9
通讯作者：
Hakuta, K
中科院分区：
文献类型：
--
作者：
Le Kien, F;Gupta, SD;Hakuta, K
我们研究亚波长直径光纤附近铯原子的自发发射。我们表明，引导模式的限制以及激发态和基态的简并性极大地影响自发发射过程。我们证明不同的磁性子能级具有不同的衰减率。当光纤半径约为 200 nm 时，原子自发发射的很大一部分（高达 28%）可以被引导为导模。我们的结果可能会应用于开发原子纳米探针和亚波长直径光纤的高效耦合器。
We study the spontaneous emission of a cesium atom in the vicinity of a subwavelength-diameter fiber. We show that the confinement of the guided modes and the degeneracy of the excited and ground states substantially affect the spontaneous emission process. We demonstrate that different magnetic sublevels have different decay rates. When the fiber radius is about 200 nm, a significant fraction (up to 28%) of spontaneous emission by the atom can be channeled into guided modes. Our results may find applications for developing nanoprobes for atoms and efficient couplers for subwavelength-diameter fibers.