We review basic physics and novel types of optical angular momentum. We start with a
theoretical overview of momentum and angular momentum properties of generic optical …

As they travel through space, some light beams rotate. Such light beams have angular
momentum. There are two particularly important ways in which a light beam can rotate: if …

The Doppler effect is a universal wave phenomenon that has spurred a myriad of
applications. In early manifestations, it was implemented by interference with a reference …

The linear Doppler shift is widely used to infer the velocity of approaching objects, but this
shift does not detect rotation. By analyzing the orbital angular momentum of the light …

There is recent interest in the use of light beams carrying orbital angular momentum (OAM)
for creating multiple channels within free-space optical communication systems. One crucial …

Optical activity is conventionally understood as a natural difference in the optical responses
of chiral materials with opposite handedness. It stems from the quantised spin angular …

We show that the orbital angular momentum can be used to unveil lattice properties hidden
in diffraction patterns of a simple triangular aperture. Depending on the orbital angular …

Spatial light modulators, as dynamic flat-panel optical devices, have witnessed rapid
development over the past two decades, concomitant with the advancements in micro-and …

We show that the average orbital angular momentum (OAM) of twisted light can be
measured simply and robustly with a single stationary cylindrical lens and a camera …

The modern field of optical angular momentum began with the realisation by Allen et al in
1992 that, in addition to the spin associated with polarisation, light beams with helical phase …