Two teams of astronomers have simultaneously discovered a strange, spinning dead star that seems to defy our current ...

Orbital Angular Momentum (OAM) has been considered as a new dimension against the traditional domains based on the electric field strength of Electro-Magnetic (EM) waves. For the long distance ...

We design, fabricate and demonstrate chip-scale inverse-designed multimode meta-waveguides to generate OAM beam. By experimental measurement, eight kinds of optical vortex beams can be generated in ...