Vortex states of photons, electrons, and other particles are non-plane-wave solutions of the
corresponding wave equation with helicoidal wave fronts. These states possess an intrinsic …

Solving Maxwell's equations in cylindrical coordinates yields states in quantum theory with
definite values of energy ℏω, longitudinal momentum ℏk z, and total angular momentum …

We explore the process of orbital angular momentum (OAM) transfer from a twisted light
beam to an electron in atomic ionization within the first Born approximation. The …

Gamma-ray beams with a large angular momentum may affect astrophysical phenomena,
which calls for appropriate earth-based experimental investigations. For this purpose, we …

We report on a method to generate extreme ultraviolet vortices from high-order harmonic
generation with two-color counter-rotating Laguerre-Gaussian (LG) beams that carry a well …

In a recent experiment, Schmiegelow et al.[Nat. Commun. 7, 12998 (2016) 2041-1723
10.1038/ncomms12998] investigated the magnetic sublevel population of Ca+ ions in a …

Vortex light beams are structures of the electromagnetic field with a spiral phase ramp
around a point-phase singularity. These vortices have many applications in the optical …

We demonstrate for the first time, to the best of our knowledge, the ability of extreme
ultraviolet (XUV) Hartmann wavefront sensors to characterize high charge vortex beams …

Interaction of twisted strong laser radiation with electrons in the classical regime is
considered. We investigate transfer of the angular momentum of absorbed laser photons to …

Vortex γ-ray beams with large orbital angular momentum (OAM) have significant potential
applications in material science, nuclear detection, and astrophysics. An all-optical scheme …