LAUSR

The optical vortex beam with orbital angular momentum (OAM) has recently received considerable attention in high-speed optical communication due to its spatial orthogonality. For realizing undamaged demultiplexing, an all-dielectric multiplexed metasurface for demultiplexing wavelength-division multiplexing and polarization-division multiplexing OAM light was proposed. This OAM demultiplexer works in near-infrared spectral region and the transmitted vortex beams carry original topological charges and phase distribution. It is worth mentioning that this demultiplexer is vastly different from previous demultiplexer, that not only eliminates the cumbersome process of converting vortex beams into Gaussian beams but also maintains the original property of the transmitted vortex beams. The presented demultiplexer has flexible and compact features which is suitable for OAM communication system and also the designed wavelength- and polarization-multiplexed metasurface expands the scope of metasurface compactness multifunctional photonics, which has applications in information security and anti-counterfeiting.