Optical cryptography using a multifaceted reference-beam hologram

Information Encoding with Optical Dielectric Metasurface via Independent Multichannels

“…With the well-recognized importance of information security, many cryptography techniques based on classical and quantum optics have been developed. , Optical cryptography is considered to have great potential in information security because of the availability of four degrees of freedom, such as wavelength, polarization, amplitude, and phase, which can secure information more reliably by encrypting with various combinations. Recently, metasurfaces have been reported for image encoding with only one unitary element of either polarization or wavelength (1D mode).…”