Taking inspiration from beautiful colors in nature,structural colors produced from nanostructured metasurfaces have shown great promise as a platform for bright,highly saturated,and high-resolution colors.Both plasmonic and dielectric materials have been employed to produce static colors that fulfil the required criteria for high-performance color printing,however,for practical applications in dynamic situations,a form of tunability is desirable.Combinations of the additive color palette of red,green,and blue enable the expression of further colors beyond the three primary colors,while the simultaneous intensity modulation allows access to the full color gamut.Here,we demonstrate an electrically tunable metasurface that can represent saturated red,green,and blue pixels that can be dynamically and continuously controlled between on and off states using liquid crystals.We use this to experimentally realize ultrahigh-resolution color printing,active multicolor cryptographic applications,and tunable pixels toward high-performance full-color reflective displays.

Trevon Badloe;Joohoon Kim;Inki Kim;Won-Sik Kim;Wook Sung Kim;Young-Ki Kim;Junsuk Rho

Department of Mechanical Engineering,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea;Department of Biophysics,Institute of Quantum Biophysics,Sungkyunkwan University,Suwon 16419,Republic of Korea;Department of Intelligent Precision Healthcare Convergence,Sungkyunkwan University,Suwon 16419,Republic of Korea;Department of Chemical Engineering,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea;Department of Electrical Engineering,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea;POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics,Pohang 37673,Republic of Korea;National Institute of Nanomaterials Technology(NINT),Pohang 37673,Republic of Korea

光：科学与应用（英文版）

[1]Trevon Badloe;Joohoon Kim;Inki Kim;Won-Sik Kim;Wook Sung Kim;Young-Ki Kim;Junsuk Rho-.Liquid crystal-powered Mie resonators for electrically tunable photorealistic color gradients and dark blacks)[J].光：科学与应用（英文版）,2022(06):1098-1108

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