@article {2040-8986-13-6-064019,
title = {Spin and orbital angular momentum propagation in anisotropic media: theory},
journal = {Journal of Optics},
volume = {13},
number = {6},
year = {2011},
pages = {064019},
abstract = {This paper is devoted to a study of the propagation of light beams carrying orbital angular momentum in optically anisotropic media. We first review some properties of homogeneous anisotropic media, and describe how the paraxial formalism is modified in order to proceed with a new approach dealing with the general setting of paraxial propagation along uniaxial inhomogeneous media. This approach is suitable for describing space-variant optical-axis phase plates.},
url = {http://stacks.iop.org/2040-8986/13/i=6/a=064019},
author = {A. Pic{\'o}n and A. Benseny and J. Mompart and G F Calvo}
}
@article {1367-2630-12-8-083053,
title = {Transferring orbital and spin angular momenta of light to atoms},
journal = {New Journal of Physics},
volume = {12},
number = {8},
year = {2010},
pages = {083053},
abstract = {Light beams carrying orbital angular momentum (OAM), such as Laguerre{\textendash}Gaussian (LG) beams, give rise to the violation of the standard dipolar selection rules during interaction with matter, yielding, in general, an exchange of angular momentum larger than $\#$$\#$IMG$\#$$\#$ [http://ej.iop.org/icons/Entities/planck.gif] {planck} per absorbed photon. By means of ab initio three-dimensional (3D) numerical simulations, we investigate in detail the interaction of a hydrogen atom with intense Gaussian and LG light pulses. We analyze the dependence of the angular momentum exchange with the polarization, the OAM and the carrier-envelope phase of light, as well as with the relative position between the atom and the light vortex. In addition, a quantum-trajectory approach based on the de Broglie{\textendash}Bohm formulation of quantum mechanics is used to gain physical insight into the absorption of angular momentum by the hydrogen atom.},
url = {http://stacks.iop.org/1367-2630/12/i=8/a=083053},
author = {A. Pic{\'o}n and A. Benseny and J. Mompart and J R V{\'a}zquez de Aldana and L. Plaja and G F Calvo and L. Roso}
}