Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics V
Q 62.48: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal
Twisted-light--ion interaction: the role of longitudinal fields — Guillermo. F. Quinteiro1, Christian. T. Schmiegelow1, and •Ferdinand Schmidt-Kaler2 — 1Departamento de Fisica and IFIBA, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon I, 1428 Ciudad de Buenos Aires, Argentina — 2QUANTUM, Institut für Physik, Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany
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 Ca+ ion [1] with a 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 complete transverse field [2]. This demonstrates the relevance of all field components for the interaction of twisted light with matter.
[1] Schmiegelow et al, Nat. Comm. 7, 12998 (2016)
[2] Quinteiro, Schmiegelow and Schmidt-Kaler, arXiv 1709.05571