All light has structure, but only recently has it been possible to control it in all its degrees of
freedom and dimensions, fuelling fundamental advances and applications alike. Here we …

The interest in tailoring light in all its degrees of freedom is steadily gaining traction, driven
by the tremendous developments in the toolkit for the creation, control and detection of what …

Structured light refers to the arbitrarily tailoring of optical fields in all their degrees of freedom
(DoFs), from spatial to temporal. Although orbital angular momentum (OAM) is perhaps the …

Orbital angular momentum (OAM) of light is an important feature of structured
electromagnetic fields exhibiting non-uniform spatial distribution. In contrast to a spin …

We propose a scheme to demonstrate spatiotemporal-vortex four-wave mixing (FWM) in an
asymmetric semiconductor double quantum-well nanostructure. It is found that the orbital …

Vectorial structured light with spatially varying amplitude, phase, and polarization is
reshaping many areas of modern optics, including nonlinear optics, as diverse parametric …

We demonstrate the spin to orbital angular momentum transfer in frequency upconversion
with structured light beams. A vector vortex is coupled to a circularly polarized Gaussian …

Tunable generation of vortex beams holds relevance in various fields, including
communications and sensing. In this paper, we demonstrate the feasibility of nonlinear spin …

Preparation, control, and measurement of optical vortices are increasingly important, as they
play essential roles in both fundamental science and optical technology applications. Spatial …

Nonlinear interactions between light waves can exchange energy, linear momentum, and
angular momentum. The direction of energy flow between frequency components is usually …