论文标题
将带导光的角动量转移到原子，并在光学纳米纤维附近的电动四极转变
Transfer of angular momentum of guided light to an atom with an electric quadrupole transition near an optical nanofiber
论文作者
论文摘要
我们研究了带有光子的角动量向两级原子的转移，并在光学纳米纤维附近的电二极晶体转变。我们表明，原子上驾驶导向场的轴向轨道扭矩的产生受四极晶体过渡的内部状态选择规则，以及通过Minkowski配方中给出的光子角动量的角动量保护定律。我们发现，扭矩取决于光子角动量，原子内部状态的角动量的变化以及四极杆转变的狂犬病频率。我们以数值计算超纤维结构级别的$ M = 2 $之间的四极杆过渡的扭矩，$ 5S_ {1/2} f = 2 $和Sublevels $ M'= 0 $，1、2、2、2、3和4个超级结构级别的超级结构级别$ 4d_ $ 4d_ $ 4d_ {5/2} $ {5/2 $} $ n $ a $^$ a = 4 $ a = 4 $^$ a = 4 $^a = 4 a = 4 a = 4.我们表明，高阶模式的扭矩的绝对值He $ _ {21} $大于基本模式的扭矩He $ _ {11} $，除了Case $ M'-M = 2 $，其中$ _ {21} $的扭矩是消失的。
We study the transfer of angular momentum of guided photons to a two-level atom with an electric quadrupole transition near an optical nanofiber. We show that the generation of the axial orbital torque of the driving guided field on the atom is governed by the internal-state selection rules for the quadrupole transition and by the angular momentum conservation law with the photon angular momentum given in the Minkowski formulation. We find that the torque depends on the photon angular momentum, the change in the angular momentum of the atomic internal state, and the quadrupole-transition Rabi frequency. We calculate numerically the torques for the quadrupole transitions between the sublevel $M=2$ of the hyperfine-structure level $5S_{1/2}F=2$ and the sublevels $M'=0$, 1, 2, 3, and 4 of the hyperfine-structure level $4D_{5/2}F'=4$ of a $^{87}$Rb atom. We show that the absolute value of the torque for the higher-order mode HE$_{21}$ is larger than that of the torque for the fundamental mode HE$_{11}$ except for the case $M'-M=2$, where the torque for the mode HE$_{21}$ is vanishing.
