Phase‐Only Tuning of Extreme Huygens Metasurfaces Enabled by Optical Anisotropy

Pure phase modulation of light is vital for a number of optical devices such as spatial light modulators and beam steering in light detection and ranging (LIDAR) technologies. Tunable metasurfaces have recently provided a feasible alternative to existing technologies, allowing for ultra‐high miniaturisation while enabling high transmission efficiency and tunability under small external stimuli. However, despite the recent advances in the field,...