Addressable metasurfaces for dynamic holography and optical information encryption.
Addressable metasurfaces for dynamic holography and optical information encryption.
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DOI：
10.1126/sciadv.aar6768
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发表时间：
2018-06
期刊：
影响因子：
13.6
通讯作者：
Liu N
中科院分区：
文献类型：
--
作者：
Li J;Kamin S;Zheng G;Neubrech F;Zhang S;Liu N
我们提出了用于光学信息加密和全息术的可寻址等离子体亚表面。亚表面具有传统光学元件所不具备的一系列优点，如超紧凑性、深亚波长范围内精确的位相和偏振控制以及多功能，使光的传播达到了前所未有的水平。在这一领域的最新进展见证了过多的功能超表面，从透镜和涡旋光束产生到全息术。然而，研究工作主要集中在静态设备上，只利用了元表面可以提供的机会的一瞥。我们展示了一个动态的亚表面平台，它允许通过受控的化学反应在可见频率下独立操作可寻址的亚波长像素。特别是，我们创建了用于高级光学信息处理和加密的动态亚表面全息图。等离子体纳米棒被定制为在氢化/脱氢时表现出分级反应动力学，构成了多路复用亚表面中的可寻址像素。光、氢、氧的螺旋度和反应持续时间作为加密变形表面的多个密钥。一个单一的元表面可以用定制的密钥解密成多种消息，具有紧凑的数据存储方案和高级别的信息安全。我们的工作提出了一种保护和传输机密数据的新方法，其中对信息的访问施加了严格的限制。
We present addressable plasmonic metasurfaces for optical information encryption and holography. Metasurfaces enable manipulation of light propagation at an unprecedented level, benefitting from a number of merits unavailable to conventional optical elements, such as ultracompactness, precise phase and polarization control at deep subwavelength scale, and multifunctionalities. Recent progress in this field has witnessed a plethora of functional metasurfaces, ranging from lenses and vortex beam generation to holography. However, research endeavors have been mainly devoted to static devices, exploiting only a glimpse of opportunities that metasurfaces can offer. We demonstrate a dynamic metasurface platform, which allows independent manipulation of addressable subwavelength pixels at visible frequencies through controlled chemical reactions. In particular, we create dynamic metasurface holograms for advanced optical information processing and encryption. Plasmonic nanorods tailored to exhibit hierarchical reaction kinetics upon hydrogenation/dehydrogenation constitute addressable pixels in multiplexed metasurfaces. The helicity of light, hydrogen, oxygen, and reaction duration serve as multiple keys to encrypt the metasurfaces. One single metasurface can be deciphered into manifold messages with customized keys, featuring a compact data storage scheme as well as a high level of information security. Our work suggests a novel route to protect and transmit classified data, where highly restricted access of information is imposed.
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