Heidelberg 2015 – wissenschaftliches Programm

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SYTL: Symposium Interactions between Twisted Light and Particles

SYTL 1: Symposium on interactions between twisted light and particles I (SYTL)

SYTL 1.5: Vortrag

Freitag, 27. März 2015, 12:40–13:00, C/gHS

Ionization and excitation of atoms by twisted light — •Andrey Surzhykov — Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena

Owing to the progress in the production and application of twisted (or vortex) light beams, more possibilities arise to explore the role of of the orbital angular momentum (OAM) in the coupling between radiation and matter. In the past, a number of studies have focused on the orbital momentum transfer to colloidal particles, Bose–Einstein condensates or even semiconductors. More recent studies, moreover, aim to better understand the OAM–effects in fundamental light–matter interaction processes such as the photon absorption and scattering by atoms, as well as the atomic photoeffect. In this contributions, therefore, we present a theoretical study of the photo–ionization [1] and excitation [2,3] of many–electron atoms and ions by twisted light. By making use of the density matrix theory we analyze the interaction of vortex beams with macroscopic targets of randomly distributed atoms. We argue that for such a (realistic) scenario the OAM of the incident light may strongly affect both the angular distribution of photo–ionized electrons and the magnetic sublevel population of photo–excited atoms. In order to illustrate the effect of the OAM–transfer, detailed calculations will be presented for the interaction of alkali atoms with twisted light.

[1] O. Mayula et al., J. Phys. B 46, 205002 (2013).
[2] H. M. Scholz–Marggraf et al., Phys. Rev. A 90, 013425 (2014).
[3] A. Surzhykov et al., Phys. Rev. A submitted.