Immersion‐Triggered Active Switch for Spin‐Decoupled Meta‐Optics Multi‐Display

Abstract Meta‐optics exhibits many promising applications in various fields of optical displays, imaging, and information encryption. However, heading towards next‐generation intelligent displays, its broad implementation is critically restricted by the lack of practical active tuning capability. Beyond the conventional electrical/optical/mechanical/thermal tuning methods, liquid immersion has recently emerged as a facile mechanism for active spectral tuning. To further conquer the challenge in achieving active complicated optical‐field manipulation, here, an environment‐compliant switch for meta‐optics multi‐display is originally proposed and experimentally realized via the liquid immersion tuning scheme. By designing the spin‐decoupled phase array for left‐/right‐handed circular polarizations, it flexibly presents quad‐fold independent‐encoded phase distributions for different medium‐relevant and polarization‐controlled channels, thus enabling four switchable holographic images through immersion tuning. Such a proposed immersion tuning design is quite a straightforward approach for meta‐optics holographic displays, enjoying full‐spatial usage, design flexibility, and large‐scale facile implementation. Overall, the proposed liquid immersion tuning strategy for a meta‐optics multi‐display would strongly benefit the practical applications in biochemical sensing, environment‐adaptive displays, and information encryption.