Programmable Huygens’ metasurfaces for active optical phase control

All-dielectric resonant metasurfaces has been emerging as a breakthrough platform for manipulating light, leading to advanced nanophotonic device architectures for lasing, ultrathin optical elements, beam shaping and sensing [1] - [3] . However, the current metasurfaces are often locked to a fixed functionality due to their static constituent materials, which severely limits the application range of these devices. Therefore, the development of novel dynamic metasurface designs is crucial to unleash the full potential of next-generation optical devices [4] .