Shikder Allarakha, Nishchal Naveen K
Department of Physics, Indian Institute of Technology Patna, Bihta, Patna, 801106, India.
Sci Rep. 2023 Aug 28;13(1):14028. doi: 10.1038/s41598-023-41251-w.
Optical image/data encryption techniques are mostly based on the manipulation of spatial distributions of light's amplitude, phase, and polarization. Information encoding with phase involves complex interferometric set-up and polarization encoding requires Stoke's parameter measurement. Hence, they create difficulties in optical implementation. Considering the practical limitations, in this study, we demonstrate a method of single-shot intensity recording-based color image encryption by encoding the information in binary polarization states. The proposed method does not require Stoke parameter calculation. As a proof-of-concept, we demonstrated the technique with coherent and partially coherent light sources. Use of partially coherent light overcomes the speckle problem and makes the system cost-effective, useful for practical applications.
光学图像/数据加密技术大多基于对光的振幅、相位和偏振的空间分布进行操控。基于相位的信息编码涉及复杂的干涉设置，而偏振编码需要测量斯托克斯参数。因此，它们在光学实现中存在困难。考虑到实际限制，在本研究中，我们展示了一种通过在二元偏振态中编码信息来进行基于单次强度记录的彩色图像加密方法。所提出的方法不需要计算斯托克斯参数。作为概念验证，我们用相干和部分相干光源演示了该技术。使用部分相干光克服了散斑问题，使系统具有成本效益，对实际应用很有用。
