Conference papers

Short abstract

Optical Vortices (OV) can be characterized by their Topological Charge (TC). It is shown in this work that a distribution of TC over the beam transverse plane gives rise to a Coulomb-like potential for OV. Pure multipoles and 2D distributions of TC are analyzed in theory and experiments.

We discuss and experimentally demonstrate how to obtain the probability distributions for orbital angular momentum and local circulation in vortex beams of arbitrary shape.

Abstract The spatial intensity profile of vortex beams may be shaped by spatially arranging topological charges on a phase mask. In our experiments, we produced and characterized vortex beams shaped as straight lines, corners and triangles.

Optical vortices (OV) with shaped vortex cores can extend the applicability of OV, but are not well characterized by usual methods. We describe and experimentally demonstrate how shaped OV may be characterized, based on the definitions of classical orbital angular momentum and topological charge.

We show that it is possible to shape the spatial intensity profile of vortex beams by spatially arranging topological charges on a phase mask. In our experiments, we generated vortex beams shaped as straight lines, corners and triangles.

Expressions for the effective nonlinear susceptibilities are derived for nanocomposites containing ellipsoidal nanoparticles and nanoshells. The intrinsic third- and fifth-order contributions are considered for the nanoinclusions. The field enhancement is determined for silver particles.