Optical Metasurfaces for Tunable Vortex Beams (Advanced Optical Materials 24/2023)

Optical Metasurfaces for Tunable Vortex Beams In article number 2301841, V.-C. Su and co-workers experimentally demonstrate metasurface-based vortex beams featuring remarkably high optical angular momentum (OAM) modes of 32 and 16. These devices are denoted as “infinite-OAM meta-knobs” (IOMKs). This study presents the optical tunability of IOMKs through various incident light characteristics, including diverse polarizations, wavelengths, and interference eraser measurements. These findings not only represent the versatility of IOMKs but also underscore their potential significance in the generation of intricate output states. This research marks a significant step towards harnessing the capabilities of these groundbreaking optical devices.