Spin‐Decoupled Phase Engineering With Identical Meta‐Atoms

ABSTRACT As a cornerstone of complex optical field manipulation, metasurface‐enabled spin decoupling has attracted tremendous attention with diverse applications ranging from spin photonics to information processing. However, conventional strategies typically rely on meta‐atoms with varying sizes and rotation angles, leading to increased design complexity and fabrication challenges. Here, we present the first demonstration of spin‐decoupled phase engineering realized with identical meta‐atoms through structural‐lattice and inter‐structure interactions in a diatomic, high‐fold symmetric configuration. By precisely controlling the previously undesirable coupling phase, which exhibits spin‐non‐conjugate characteristics and can be tuned via the diatomic‐included angle, we achieve independent control of coupled and noncoupled states. Our experiments confirm that this framework enables spin‐decoupled metasurfaces relying solely on structural rotation, in stark contrast to conventional approaches. This paradigm substantially simplifies large‐scale fabrication, and more importantly, opens new avenues for reconfigurable spin photonics, high‐capacity optical encryption, and next‐generation flat‐optical devices.