The general question, crucial to an understanding of the internal structure of the nucleon, of
how to split the total angular momentum of a photon or gluon into spin and orbital …

Since the development of laser light sources in the early 1960s, laser beams are
everywhere. Laser beams are central in many industrial applications and are essential in …

We present the first observational evidence that light propagating near a rotating black hole
is twisted in phase and carries orbital angular momentum (OAM). This physical observable …

We present a theoretical study of high-order harmonic generation (HHG) and propagation
driven by an infrared field carrying orbital angular momentum (OAM). Our calculations unveil …

High-order harmonic generation (HHG) has been recently proven to produce extreme-
ultraviolet (XUV) vortices from the nonlinear conversion of infrared twisted beams. Previous …

The Laguerre-Gauss modes are a class of fundamental and well-studied optical fields.
These stable shape-invariant photons, exhibiting circular-cylindrical symmetry, are familiar …

We address and solve the long-standing gauge-invariance problem of the nucleon spin
structure. Explicitly gauge-invariant spin and orbital angular momentum operators of quarks …

Metasurfaces have recently entered the realm of quantum photonics, enabling manipulation
of quantum light using a compact nanophotonic platform. Realizing the full potential of …

Light beams carrying orbital angular momentum (OAM), such as Laguerre–Gaussian (LG)
beams, give rise to the violation of the standard dipolar selection rules during interaction …

Canonical separation of angular momentum of light into its orbital and spin parts Page 1 Journal
of Optics Canonical separation of angular momentum of light into its orbital and spin parts To …