High-resolution grayscale image hidden in a laser beam
High-resolution grayscale image hidden in a laser beam
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DOI：
10.1038/lsa.2017.129
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发表时间：
2018-01-26
影响因子：
19.4
通讯作者：
Chen, Xianzhong
中科院分区：
文献类型：
--
作者：
Yue, Fuyong;Zhang, Chunmei;Chen, Xianzhong
人眼感知或相机记录的图像通常是具有空间变化强度或颜色分布的光学图案。除了强度和颜色之外，图像的信息还可以以相位或偏振状态的空间变化分布进行编码。有趣的是，此类图像可能无法通过人眼或相机直接查看，因为它们可能表现出高度均匀的强度分布。在这里，我们提出并通过实验演示了一种在尺寸小于半毫米的方形激光束中隐藏高分辨率灰度图像的方法。像素大小为 300 x 300 nm 的图像被编码为激光束的空间变化偏振状态，在通过线性偏振器后可以显示出来。这种隐藏灰度图像和偏振操纵的独特技术为各种应用提供了新的机会，包括加密、成像、光通信、量子科学和基础物理学。
Images perceived by human eyes or recorded by cameras are usually optical patterns with spatially varying intensity or color profiles. In addition to the intensity and color, the information of an image can be encoded in a spatially varying distribution of phase or polarization state. Interestingly, such images might not be able to be directly viewed by human eyes or cameras because they may exhibit highly uniform intensity profiles. Here, we propose and experimentally demonstrate an approach to hide a high-resolution grayscale image in a square laser beam with a size of less than half a millimeter. An image with a pixel size of 300 x 300 nm is encoded into the spatially variant polarization states of the laser beam, which can be revealed after passing through a linear polarizer. This unique technology for hiding grayscale images and polarization manipulation provides new opportunities for various applications, including encryption, imaging, optical communications, quantum science and fundamental physics.