Experimental verification of position-dependent angular-momentum selection rules for absorption of twisted light by a bound electron
Experimental verification of position-dependent angular-momentum selection rules for absorption of twisted light by a bound electron
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DOI：
10.1088/1367-2630/aaa63d
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发表时间：
2018-02-09
影响因子：
3.3
通讯作者：
Solyanik, Maria
中科院分区：
文献类型：
--
作者：
Afanasev, Andrei;Carlson, Carl E.;Solyanik, Maria
我们分析了原子在扭曲光下的多极激发，即通过携带轨道角动量的涡旋光场。单个捕获的Ca-40（+）离子作为激发场的定位探针。我们驱动了theS(1/2) -> D-5/2跃迁，并观察了不同跃迁的相对强度，这取决于离子相对于旋涡光场中心的横向位置。另一方面，计算了贝塞尔光束、贝塞尔-高斯模式和拉盖尔-高斯模式下的扭曲光场的跃迁幅度。通过分析实验得到的过渡幅值，我们发现与理论预测的一致性在3%以上。最后，我们提出了双离子晶体的测量方案，以提高未来实验中涡模式的传感精度。
Weanalyze the multipole excitation of atoms with twisted light, i.e, by a vortex light field that carries orbital angular momentum. A single trapped Ca-40(+) ion serves as a localized and positioned probe of the exciting field. We drive theS(1/2) -> D-5/2 transition and observe the relative strengths of different transitions, depending on the ion's transversal position with respect to the center of the vortex light field. On the other hand, transition amplitudes are calculated for a twisted light field in form of a Bessel beam, a Bessel-Gauss and a Laguerre-Gauss mode. Analyzing experimental obtained transition amplitudes we find agreement with the theoretical predictions at a level of better than 3%. Finally, we propose measurement schemes with two-ion crystals to enhance the sensing accuracy of vortex modes in future experiments.