Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
Phys Rev Lett. 2011 Dec 9;107(24):243601. doi: 10.1103/PhysRevLett.107.243601. Epub 2011 Dec 7.
We dispersively interface an ensemble of 1000 atoms trapped in the evanescent field surrounding a tapered optical nanofiber. This method relies on the azimuthally asymmetric coupling of the ensemble with the evanescent field of an off-resonant probe beam, transmitted through the nanofiber. The resulting birefringence and dispersion are significant; we observe a phase shift per atom of ∼1 mrad at a detuning of 6 times the natural linewidth, corresponding to an effective resonant optical density per atom of 0.027. Moreover, we utilize this strong dispersion to nondestructively determine the number of atoms.
我们将 1000 个原子分散地置于锥形光纤周围的消逝场中。这种方法依赖于集合与通过光纤传输的非共振探测光束的消逝场的非对称角向耦合。所产生的双折射和色散非常显著；在失谐量为自然线宽的 6 倍时，我们观察到每个原子的相移约为 1 mrad，对应于每个原子的有效共振光密度为 0.027。此外，我们利用这种强色散来无损地确定原子的数量。
