Yuan Huan, Zhong Zheqiang, Zhang Bin
Opt Lett. 2024 Feb 1;49(3):498-501. doi: 10.1364/OL.511078.
Metasurface holographic encryption, with high resolution and strong concealment, is promising for information security. However, traditional metasurface holographic encryption is limited by spin-polarization channels and monochromaticity, restricting the level of security and information capacity. In this Letter, we propose a 9-bit spin- and wavelength-encoded hologram achieved by encoding phase and amplitude information into full spin polarization and primary color channels using a hybrid metasurface. Our hybrid metasurface structure can break the limitations of traditional metasurfaces, significantly increasing the number of encoded channels by an order of magnitude. We believe that this strategy can provide a new, to the best of our knowledge, approach to high-capacity information encoding and encryption.
超表面全息加密具有高分辨率和强隐蔽性，在信息安全方面颇具潜力。然而，传统的超表面全息加密受到自旋极化通道和单色性的限制，制约了安全级别和信息容量。在本信函中，我们提出了一种9位自旋和波长编码全息图，它是通过使用混合超表面将相位和幅度信息编码到全自旋极化和原色通道中实现的。我们的混合超表面结构能够突破传统超表面的限制，将编码通道数量显著增加一个数量级。据我们所知，我们相信这种策略能够为高容量信息编码和加密提供一种全新的方法。
