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Metasurfaces enable manipulation of light propagation at an unprecedentedlevel, benefitting from a number of merits unavailable to conventional opticalelements, such as ultracompactness, precise phase and polarization control atdeep subwavelength scale, and multifunctionalities. Recent progress in thisfield has witnessed a plethora of functional metasurfaces, ranging from lensesand vortex beam generation to holography. However, research endeavors have beenmainly devoted to static devices, exploiting only a glimpse of opportunitiesthat metasurfaces can offer. We demonstrate a dynamic metasurface platform,which allows independent manipulation of addressable subwavelength pixels atvisible frequencies through controlled chemical reactions. In particular, wecreate dynamic metasurface holograms for advanced optical informationprocessing and encryption. Plasmonic nanorods tailored to exhibit hierarchicalreaction kinetics upon hydrogenation/dehydrogenation constitute addressablepixels in multiplexed metasurfaces. The helicity of light, hydrogen, oxygen,and reaction duration serve as multiple keys to encrypt the metasurfaces. Onesingle metasurface can be deciphered into manifold messages with customizedkeys, featuring a compact data storage scheme as well as a high level ofinformation security. Our work suggests a novel route to protect and transmitclassified data, where highly restricted access of information is imposed.

Addressable metasurfaces for dynamic holography and optical information encryption