The identification of orbital angular momentum (OAM) as a fundamental property of a beam
of light nearly 25 years ago has led to an extensive body of research around this topic. The …

In magnetic materials, skyrmions are nanoscale regions where the orientation of the electron
spin changes in a vortex-type manner,,–. Electromagnetic waves carry both spin and orbital …

We present a comprehensive introduction to spacetime algebra that emphasizes its
practicality and power as a tool for the study of electromagnetism. We carefully develop this …

We introduce a definition of the electromagnetic chirality of an object and show that it has an
upper bound. Reciprocal objects attain the upper bound if and only if they are transparent for …

Circular dichroism, that is, the differential absorption of a system to left and right circularly
polarized light, is one of the only techniques capable of providing morphological information …

In optics, whispering gallery modes (WGMs) are modes of light that arise in cylindrically
symmetric structures. Their intensity profile is strongly confined around the interface of the …

We demonstrate the generation of far-field propagating optical beams with a desired orbital
angular momentum by using a smooth optical-mode transformation between a plasmonic …

Chirality of light is of fundamental importance in several enabling technologies with growing
applications in life sciences, chemistry and photodetection. Recently, some attention has …

The multipolar decomposition of current distributions is used in many branches of physics.
Here, we obtain new exact expressions for the dipolar moments of a localized electric …

The study of helicity in the context of light-matter interactions is an increasing area of
research. However, some fundamental aspects of the helicity content of light fields inside …