Plasmon Metasurfaces: Gap‐Surface Plasmon Metasurfaces for Broadband Circular‐to‐Linear Polarization Conversion and Vector Vortex Beam Generation (Advanced Optical Materials 9/2019)

Gap-surface plasmon metasurface-based quarter-wave plates have been used by Fei Ding, Yuanqing Yang and co-workers (article number 1801414) to generate vector vortex beams possessing spatially-varied distributions of the polarization vector and carrying specified orbital angular momentums. The developed approach allows compact, cost-effective, and high-performance polarization converters to be realized, paving the way for the ultimate miniaturization of optical devices with arbitrary control of light fields.