Optical Fiber‐End Metasurfaces: Theories and Applications

ABSTRACT Fiber end‐face metasurfaces represent an emerging frontier in integrated photonics, combining the advanced light‐field manipulation capabilities of metasurfaces with the robust transmission properties of optical fibers, and enabling compact, high‐performance photonic devices. These devices trace the route to beam shaping, polarization control, vortex generation, and high‐sensitivity sensing. This work starts by presenting several available fabrication methods in nanoscale. Two‐photon po