Observation of modified radiative properties of cold atoms in vacuum near a dielectric surface
Observation of modified radiative properties of cold atoms in vacuum near a dielectric surface
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观察介电表面附近真空中冷原子的修改辐射特性
DOI：
10.1088/1464-4266/6/11/005
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
R. Spreeuw
中科院分区：
文献类型：
--
作者：
V. Ivanov;R. Cornelussen;H. Heuvell;R. Spreeuw
我们已经观察到靠近介电-真空界面的冷87rb原子的距离依赖吸收线宽。这是第一次观察到介电表面附近真空中改变的辐射特性。使用磁光阱（MOT）和光学糖蜜冷却产生了冷原子云。用倏逝波（EW）观察了地表附近的地震波的行为。我们观察到，相对于自由空间值，吸收线宽增加了25%。大约一半的展宽可以用腔量子电动力学（CQED）解释为自然线宽和非均匀展宽的增加。剩下的我们认为是地表附近斯塔克的局部移动造成的。通过改变特征电子束长度，我们观察到CQED的距离依赖特性。
We have observed a distance-dependent absorption linewidth of cold 87 Rb atoms close to a dielectric–vacuum interface. This is the first observation of modified radiative properties in vacuum near a dielectric surface. A cloud of cold atoms was created using a magneto-optical trap (MOT) and optical molasses cooling. Evanescent waves (EW) were used to observe the behaviour of th ea toms near the surface. We observed an increase of the absorption linewidth by up to 25% with respect to the free-space value. Approximately half the broadening can be explained by cavity quantum electrodynamics (CQED) as an increase of the natural linewidth and inhomogeneous broadening. The remainder we attribute to local Stark shifts near the surface. By varying the characteristic EW length we have observed ad istance dependence characteristic for CQED.