El Gawhary, Van Mechelen, and Urbach reply

Role of Radial Charges on the Angular Momentum of Electromagnetic Fields: Spin- 3/2 Light

Electromagnetic fields carry a linear and an angular momentum, the first being responsible for the existence of the radiation pressure and the second for the transfer of torque from electromagnetic radiation to matter. The angular momentum is considered to have two components, one due to the polarization state of the field, usually called...