Multi-state parallel reconfiguration of nanoprinting and holography in Ge₂Sb₂Se₄Te₁ phase-change metasurfaces

Metasurfaces enable exceptional optical wavefront manipulation at the subwavelength scale, underpinning diverse applications from structural-color nanoprinting to meta-holography. Although recent advances have integrated these dual functionalities within a single device, such platforms remain intrinsically static, constraining their practical utility. Here, we introduce a dynamically reconfigurable metasurface platform based on the phase-change material Ge₂Sb₂Se₄Te₁ (GSST), overcoming this fundamental limitation. By exploiting the orthogonal transmission properties of GSST meta-atoms and employing a phase-dependent spatial multiplexing strategy, we achieve precise control over the near-field electric field intensity distribution, enabling active switching of nanoprinting images. Simultaneously, the Pancharatnam-Berry phase is independently tailored within each pixel to manipulate the far-field wavefront for holographic projections, thereby realizing seamless integration of multi-state dynamic nanoprinting and multiplexed meta-holography. As a proof of concept, we numerically demonstrate two metasurface samples capable of triple-state, dual-mode dynamic switching, where both near-field patterns and far-field holograms are reconfigurable on demand. Furthermore, by incorporating the angular degeneracy associated with Malus' law, an additional near-field nanoprinting channel is established under orthogonal linear polarization paths, substantially enriching the functional dimensionality of the device. Building upon this platform, we further develop a high-security, multi-key, dual-level optical information encryption scheme that ensures robust physical-layer security against unauthorized access and information leakage. This work establishes a reliable and efficient pathway toward reconfigurable metasurfaces, unlocking opportunities for next-generation dynamic displays, advanced information encryption, optical anti-counterfeiting, and related applications.