Jiahao Wang, Kai Qu, Junzhe Ni, Weixu Yang, Kui Tang, Shufang Dong, Shaojie Wang, Junming Zhao, Tian Jiang, Ke Chen, Yijun Feng
Abstract Broadband achromatic meta-devices have emerged as a transformative platform for dispersion-engineered wavefront manipulation, offering significant potential for full-color imaging, multi-band spectral sensing, and integrated photonic systems. However, realizing spin-unlocked achromatic functionality remains fundamentally challenging due to the intrinsic dispersion correlations between orthogonal spin channels in conventional metasurface architectures. Here, we propose a hybrid-phase strategy that synergistically combines the distinct dispersion characteristics of Aharonov-Anandan and Pancharatnam-Berry geometric phases. This mechanism is implemented through a single-layer double-arc meta-structure that enables broadband achromatic wavefront control with complete spin-channel independence. As experimental validation, we demonstrate spin-unlocked achromatic meta-devices including dual-functionality beam deflectors and high-efficiency meta-lenses, both exhibiting broadband chromatic-aberration-free performances. This approach establishes a new paradigm for spin-unlocked achromatic metasurfaces and paves the way for multi-channel optical imaging, on-chip spectral detection, and other emerging spin-photonic applications.