In ultracompact image displays based on metasurfaces, the image color is usually controlled by varied nanostructure dimensions, which requires elaborate design and precise manufacturing of nanostructures. Here, we present a metasurface composed of equal-sized nanostructures to control the color of output light, simply by polarization control. Specifically, with resonances occurring in two orthogonal axes for different wavelengths, each nanostructure of the metasurface acts as a biaxial nano-polarizer and reflect most of incident red and green light polarized along the long and short axes, respectively. Hence, by means of reconfiguring the orientations of the biaxial nano-polarizers, the mixture of red and green light with different intensity ratio, governed by Malus law, can be employed to generate a pseudo-colored nanoprinting image. We experimentally demonstrate the proposed metasurfaces by successfully encoding and decoding pseudo-color nanoprinting images right at the metasurfaces. With advantages such as flexible image display and ultra-simple nanostructure design, the proposed dichroic polarizing metasurface can promote advanced research of metasurfaces in color control, ultracompact image display, pseudo-color processing, and many other related fields.

中文翻译：

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用于色彩控制和伪色彩编码的二向色偏极表面

在基于超表面的超紧凑型图像显示器中，图像颜色通常由变化的纳米结构尺寸控制，这需要精心设计和精确制造纳米结构。在这里，我们介绍了一个由等大小的纳米结构组成的超表面，可以简单地通过偏振控制来控制输出光的颜色。具体地，在针对不同波长的两个正交轴中发生共振的情况下，超颖表面的每个纳米结构均充当双轴纳米偏振器，并分别反射沿长轴和短轴偏振的大部分入射红光和绿光。因此，通过重新配置双轴纳米偏振器的取向，可以采用由马鲁斯定律（Malus law）控制的具有不同强度比的红光和绿光的混合物来产生伪彩色的纳米印刷图像。我们通过在正反面成功地编码和解码伪彩色纳米印刷图像，实验性地证明了所提出的反面。凭借灵活的图像显示和超简单的纳米结构设计等优点，所提出的二向色偏振超颖表面可以促进超颖表面在色彩控制，超紧凑图像显示，伪彩色处理以及许多其他相关领域的高级研究。