Thirty years ago, Coullet et al. proposed that a special optical field exists in laser cavities
bearing some analogy with the superfluid vortex. Since then, optical vortices have been …

The field of 3D micro‐optics is rapidly expanding, and essential advances in femtosecond
laser direct‐write 3D multi‐photon lithography (MPL, also known as two‐photon or multi …

Herein, we have discussed three major methods which have been generally employed for
the generation of optical beams with orbital angular momentum (OAM). These methods …

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 …

Non-Hermitian exceptional points (EPs) represent a special type of degeneracy where not
only the eigenvalues coalesce, but also the eigenstates tend to collapse on each other …

Vortex beams are playing an increasingly crucial role in wireless optical communications.
Traditional vortex beam generators based on spiral phase plates and metasurfaces have a …

As we celebrate 30 years since light's orbital angular momentum (OAM) was connected to its
spatial structure, we reflect on the advances made in fundamental science and applications …

In this paper, metasurfaces are designed, fabricated and experimentally demonstrated to
transmit and receive a mixed-mode orbital angular momentum (OAM) vortex wave. Firstly …

The scintillation of the orbital angular momentum (OAM) of a Bessel Gaussian beam was
derived based on the Rytov method to characterize the performance of the OAM …

Vortex beams carrying orbital angular momentum (OAM) have been recently investigated
intensely in optical communication systems, as using OAM mode multiplexing …