Covert optical signatures are a vital element in anticounterfeiting technologies. Plasmonic surfaces offer a means of manipulating the properties of light including the realization of colored pixels and images. In this work, concealed images with accurate color reproduction using plasmonic pixel arrays are demonstrated. The spectral and spatial control of optical polarization conversion is accomplished by tailoring the interaction of light with surface plasmons through the design and arrangement of surface nanostructures. The latent image is revealed using a polarization‐sensitive optical system, which represents a means for the authentication of security features that can be created using these nanostructured devices. A red–green–blue color space is defined containing a wide gamut of chromaticities, enabling comprehensive full‐color image capability. The device concept extends the functionality of a polarization‐dependent plasmonic response to realize the encoding of a color image in covert form.

中文翻译：

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使用表面等离激元介导的光偏振转换的秘密图像

隐蔽的光学签名是防伪技术中的重要元素。等离子表面提供了一种操纵光属性的方法，包括实现彩色像素和图像。在这项工作中，展示了使用等离激元像素阵列具有精确色彩还原的隐藏图像。通过设计和布置表面纳米结构来调整光与表面等离子体激元的相互作用，可以实现光偏振转换的光谱和空间控制。潜像是使用偏振敏感光学系统显示的，这是一种可以使用这些纳米结构设备创建的安全特征验证方法。定义了一个红色-绿色-蓝色的色彩空间，其中包含许多色度，实现全面的全彩色图像功能。该设备概念扩展了偏振相关等离子体响应的功能，以实现对隐秘形式的彩色图像进行编码。