Quinteiro G F, Schmidt-Kaler Ferdinand, Schmiegelow Christian T
Departamento de Física and IFIBA, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón I, 1428 Ciudad de Buenos Aires, Argentina.
QUANTUM, Institut für Physik, Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany.
Phys Rev Lett. 2017 Dec 22;119(25):253203. doi: 10.1103/PhysRevLett.119.253203. Epub 2017 Dec 20.
The propagation of light beams is well described using the paraxial approximation, where field components along the propagation direction are usually neglected. For strongly inhomogeneous or shaped light fields, however, this approximation may fail, leading to intriguing variations of the light-matter interaction. This is the case of twisted light having opposite orbital and spin angular momenta. We compare experimental data for the excitation of a quadrupole transition in a single trapped ^{40}Ca^{+} ion from Schmiegelow et al. [Nat. Commun. 7, 12998 (2016)NCAOBW2041-172310.1038/ncomms12998] with a complete model where longitudinal components of the electric field are taken into account. Our model matches the experimental data and excludes by 11 standard deviations the approximation of a complete transverse field. This demonstrates the relevance of all field components for the interaction of twisted light with matter.
使用傍轴近似可以很好地描述光束的传播，在这种近似中，通常会忽略沿传播方向的场分量。然而，对于强非均匀或成形光场，这种近似可能会失效，从而导致光与物质相互作用出现有趣的变化。具有相反轨道角动量和自旋角动量的扭曲光就是这种情况。我们将施米格洛等人 [《自然·通讯》7, 12998 (2016年)NCAOBW2041 - 172310.1038/ncomms12998] 对单个捕获的(^{40}Ca^{+})离子中四极跃迁激发的实验数据与一个考虑了电场纵向分量的完整模型进行了比较。我们的模型与实验数据相符，并以11个标准差排除了完全横向场的近似。这证明了所有场分量对于扭曲光与物质相互作用的相关性。
