Nanowerk September 26, 2022 The precise control of phase, amplitude, polarization, metasurface holography provides a flexible platform for light modulation, optical encryption. The process of image reconstruction by single pixel imaging is similar to a form of encoding and decoding, which is realized by calculating the correlation between a series of modulation patterns and their corresponding intensity signals. Researchers in China proposed an optical encryption scheme based on spatial multiplexing metasurface, which depends on the combination of holographic technology and single pixel imaging technology. In the encryption scheme, the image transmitted by single pixel imaging based on metasurface was used […]
Category Archives: Encryption
Novel fluorescent organohydrogel proposed to achieve dual information encryption
Phys.org June 10, 2022 Researchers in China designed an organohydrogel by constructing interpenetrating organohydrogel networks, in which naphthylamide moieties (DEAN, green-yellow emission) are introduced in hydrophilic poly(N,N-dimethylacrylamide) (PDMA) hydrogel network and anthracene units (blue emission) are copolymerized in hydrophobic polystearate methacrylate (PSMA) organogel network. UV light of 365 nm triggers the unimer–dimer transition and leads the fluorescent color of organohydrogel to change from blue to faint yellow. Photomasks store the secret information. They achieved dual encryption by combining crystallization-induced shape memory performance. According to the researchers fluorescent organohydrogel provides a new idea for fabricating smart materials with the ability of […]
Photonic encryption platform in the ultraviolet and visible
Science Daily March 17, 2022 Researchers in South Korea have developed an optical encryption platform that works simultaneously in the visible and ultraviolet (UV) regimes. They adjusted the physical properties of silicon nitride to reduce its tendency to absorb ultraviolet light. They fabricated a metahologram in which an image clearly appears when ultraviolet laser is irradiated on it. They combined the two metaholograms that work in the ultraviolet and visible light regions to create an anticounterfeiting device that displays a unique product number. The hologram that appears when a visible light laser is irradiated acts as a key and when […]
Using quantum Parrondo’s random walks for encryption
Phys.org October 15, 2021 Quantum game theory has stimulated some interest in recent years with the advancement of quantum information theory. This interest has led to a resurgence of quantum Parrondo’s games. With two losing games combining to give a winning game, this paradoxical idea is known as Parrondo’s paradox. Researchers in Singapore used chaotic switching between the two losing quantum games, to show that it is possible to achieve Parrondo’s paradox involving a quantum walker playing two-sided quantum coin tossing games. They showed that the framework of chaotic switching in quantum coin tosses can be applied to encryption. This […]