As an indispensable complement to an integer vortex beam, the fractional vortex beam has
unique physical properties such as radially notched intensity distribution, complex phase …

This article reviews recent progress leading to the generation of optical vortex beams. After
introducing the basics of optical vortex beams and their promising applications, we …

We propose a vortex beam generator based on a nanometer spiral slit and explore the
propagation rule of the topological charge. Compared to the common methods of generation …

Since the second half of the 20th century, ideas to develop methods for the formation of
optical vortices (OVs) or OV beams–regions of circular motion of energy flow in an …

Surface plasmon polaritons (SPPs), surface electromagnetic waves propagating along metal-
dielectric interfaces, have found numerous applications in integrated photonic devices …

Zero-order and higher-order Bessel beams are well-known nondiffracting beams. Namely,
they propagate with invariant profile (intensity) and carry a fixed orbital angular momentum …

Helical light fields may carry both orbital angular and spin angular momentum which is
respectively associated with their helical wavefronts (optical vortices) and rotating transverse …

We investigate theoretically the generation of extreme-ultraviolet (EUV) beams carrying
fractional orbital angular momentum. To this end, we drive high-order harmonic generation …

The creation and manipulation of optical vortices, both in free space and in two-dimensional
systems such as surface plasmon polaritons (SPPs), has attracted widespread attention in …

An optical vortex with orbital angular momentum (OAM) can be used to induce microscale
chiral structures in various materials. Such chiral structures enable the generation of a …