Rotational Vortex Metasurface Arrays Enabling Tunable Perfect Petal‐Shaped Beam Emissions (Advanced Optical Materials 16/2024)

Rotational Vortex Metasurface Arrays The desire to generate complex output responses and device miniaturization has primarily driven the development of actively adjustable optical metasurfaces. In article number 2303066, Meng-Hsin Chen and co-workers experimentally demonstrate actively tunable petal-shaped pattern emissions by the cascade of two innovative rotational vortex metasurface arrays (RVMAs). The petal-shaped beams with various petal numbers and diameters have been successfully validated at visible wavelengths, affirming the remarkable versatility of the authors' approach. The results of this work are crucial breakthroughs for actively tunable optical metasurfaces.