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The colour gamut,a two-dimensional (2D) colour space primarily comprising hue and saturation (HS),lays the most important foundation for the colour display and printing industries.Recently,the metasurface has been considered a promising paradigm for nanoprinting and holographic imaging,demonstrating a subwavelength image resolution,a fiat profile,high durability,and multi-functionalities.Much effort has been devoted to broaden the 2D HS plane,also known as the CIE map.However,the brightness (B),as the carrier of chiaroscuro information,has long been neglected in metasufface-based nanoprinting or holograms due to the challenge in realising arbitrary and simultaneous control of full-colour HSB tuning in a passive device.Here,we report a dielectric metasurface made of crystal silicon nanoblocks,which achieves not only tailorable coverage of the primary colours red,green and blue (RGB) but also intensity control of the individual colours.The colour gamut is hence extruded from the 2D CIE to a complete 3D HSB space.Moreover,thanks to the independent control of the RGB intensity and phase,we further show that a singlelayer silicon metasurface could simultaneously exhibit arbitrary HSB colour nanoprinting and a full-colour hologram image.Our findings open up possibilities for high-resolution and high-fidelity optical security devices as well as advanced cryptographic approaches.
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篇名 Full-colour nanoprint-hologram synchronous metasurface with arbitrary hue-saturation-brightness control
来源期刊 光:科学与应用(英文版) 学科
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年,卷(期) 2019,(5) 所属期刊栏目
研究方向 页码范围 902-911
页数 10页 分类号
字数 语种 英文
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光:科学与应用(英文版)
双月刊
2095-5545
22-1404/O4
吉林省长春市东南湖大路3888号
eng
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