38 results about "Optical encryption" patented technology

The invention discloses an optical encryption film material as well as a preparation method and application thereof, and the preparation method of the optical encryption film material comprises the following steps: uniformly mixing terephthalic acid, aliphatic dibasic acid and water to obtain a mixed aqueous solution; under the stirring action, 1, 5-pentamethylene diamine is slowly and dropwise added into the mixed aqueous solution, and a transparent salt solution is obtained; carrying out condensation polymerization reaction on the transparent salt solution to obtain nylon synthetic resin; preparing the nylon synthetic resin into a film; and carrying out two-way stretching on the film to obtain the optical encryption film material. The preparation method of the optical encryption thin film material is simple and low in cost, and the optical encryption material with higher cost performance can be prepared.

A device, method, and hybrid computing architecture for a Symbolic Photonic Logic Gate (SPLG) system that performs data processing primarily in the optical domain. The system comprises a photonic substrate, including silicon-photonics, indium phosphide, or similar optically active materials, patterned with optical waveguides and interferometric structures configured to implement logic operations through controlled optical interference, phase modulation, or non-linear optical effects. The SPLG system is configured to execute Boolean and symbolic logic functions without requiring intermediate optical-to-electrical signal conversion. In operation, information is encoded into one or more optical parameters including phase, polarization, wavelength, or amplitude, and processed within a Symbolic Optical Core optimized for linear algebraic operations such as matrix multiplication and vector transformation. The architecture further comprises an electronic control layer configured to initialize, configure, and monitor the photonic logic elements while allowing the majority of computational operations to occur within the optical domain, thereby reducing electrical interconnect congestion and resistive heating relative to fully electronic processors.

The invention provides an optical encryption communication method and system based on up-conversion pulse response, and relates to the technical field of information encryption, and the method comprises the steps: converting to-be-encrypted original data into coded data according to a preset transcoding rule; according to the coded data and a luminescence characteristic mapping table, target excitation parameters of the laser pulse are determined, the target excitation parameters comprise the target width of the laser pulse, and the luminescence characteristic mapping table is used for representing luminescence characteristics of each luminescence wave band in the up-conversion luminescent material; and exciting the up-conversion luminescent material by using a laser pulse with a target excitation parameter, so that the up-conversion luminescent material emits a fluorescence signal corresponding to the coded data. Therefore, the target excitation parameter of the laser pulse can be determined by utilizing the light emitting characteristic of the light emitting wave band in the up-conversion light emitting material, so that the emission of the fluorescence signal is realized, namely, the encrypted communication can be realized by controlling the laser pulse without switching and controlling multiple light sources, and the efficiency of the encrypted communication is improved.

The application discloses a kind of asymmetric color image optical encryption methods based on generalized singular value decomposition, including encryption process and decryption process, encryption process: asymmetric optical encryption system of color image, the technical scheme adopted is, in encryption system, a kind of double random phase encoding encryption scheme based on generalized singular value decomposition is designed, color image is first encoded into complex matrix, the complex matrix obtained is modulated with phase plate by generalized singular value decomposition, then encryption is carried out in optical Fourier transform domain using phase truncation technique, finally the ciphertext is received by charge coupled device.The application mainly aims at the problem that existing asymmetric encryption system based on phase truncation cannot resist special attack, a kind of modulation method based on generalized singular value decomposition is designed to image and random phase plate, the encryption algorithm can realize color image encryption, effectively resist shear attack, noise attack, chosen-plaintext attack and special attack.

The present application relates to the technical field of wireless charging, and particularly relates to a safety interlocking system for infrared laser long-distance wireless charging; through cooperation of spatial distribution of multiple photodiodes and hardware structure, when the light path is invaded by foreign matters, the control circuit can quickly cut off the high-power laser output, and the three-dimensional layout eliminates the spatial blind area of single-point detection, the polarization discrimination element in the transmitting end device and the phase delay element in the receiving end device are combined to construct an optical encryption closed loop, only the light received by the sensor after being inversely reflected to the receiving end rotatable polarization state is allowed, the in-phase polarized light reflected by ordinary mirror foreign matters is effectively blocked, the risk of mirror deception reflection attack in the high-power scene is greatly reduced, and through the pure hardware phase-locked loop frequency decoding circuit, only the reflected light output logic level carrying the preset modulation frequency is output, direct current and low-frequency interference of sunlight and illumination light sources are filtered from the physical layer.

The application discloses a kind of photochromic circular polarized luminescent carbon dots long afterglow composite materials and preparation method and application thereof, belong to chiral luminescent functional material technical field;The composite material with photochromic and long afterglow luminescence characteristics carbon dots as luminescent center, and with cellulose nanocrystal through self-assembly to form chiral composite system with cholesteric helical structure.Carbon dots provide fluorescent emission, photochromic and long afterglow luminescence characteristics, while the chiral structure of cellulose nanocrystal can selectively circularly polarized modulation to luminescence, so as to realize the enhancement of circular polarized luminescent signal.The composite material can realize reversible photochromic luminescence behavior under ultraviolet irradiation, and produce long afterglow emission after excitation stops, while showing obvious circular polarized luminescence characteristics.The material has the advantages of stable structure, simple preparation method, high functional integration, etc., and has good application prospect in information anti-counterfeiting, optical encryption, chiral optoelectronic devices and intelligent display fields.

The application relates to a surface enhanced Raman scattering (SERS) substrate, a preparation method and application thereof, and belongs to the technical field of Raman spectrum detection. The substrate comprises, from bottom to top, a substrate layer, a distributed Bragg reflector, a chalcogen phase change material functional layer and a nanoscale metal structure layer. The distributed Bragg reflector is composed of a periodic structure stack of medium materials with different refractive indexes. The distributed Bragg reflector is coupled with the nanoscale metal structure layer to excite a Tamm state. The chalcogen phase change material functional layer can realize reversible regulation of amorphous state and crystalline state under external light excitation, changes the Tamm state resonance wavelength to regulate the SERS enhancement effect. The application realizes high-sensitivity detection through double enhancement of the Tamm state and localized surface plasmon resonance, has the characteristics of non-volatility, reconfigurability, high reproducibility and design flexibility, is convenient to operate, stable in performance, and is suitable for fields of chemical biological sensing, laboratory chip systems and optical encryption.

The application relates to an optical encryption method and an optical encryption system, the method comprising: loading spatial plaintext information to be encrypted into an optical path to obtain an optical beam carrying the spatial plaintext information; modulating the optical beam into a time-varying optical field through a complex medium, wherein the dynamic characteristics of the complex medium vary with time and repeat in a fixed period, and the periodic variation of the optical field is determined by the fixed period; collecting information of the optical field in a preset time period within the fixed period as time-domain ciphertext data. In the optical encryption, an additional key control parameter, i.e. the optical field information in a specific time period within the selection period, is introduced to generate the ciphertext, the generation of the ciphertext becomes more complex and unpredictable, the key space is expanded, the leakage of the periodic characteristics of the optical field is avoided, and the security of the system is significantly enhanced. Meanwhile, since the encryption no longer depends on complete time sequence data, the requirement for the hardware performance is reduced, the implementation cost is further reduced, and the encryption efficiency is improved.

An optical encryption camera includes a sensor array and a filter positioned over the sensor array to receive light prior to the sensor array. The filter includes a multiplexing mask and a scaling mask in sequence. The multiplexing mask and the scaling mask combine to provide an encryption key to encrypt image data prior to capture.

This invention provides a photosensitive polyurethane film with a surface grating, its preparation method, and its applications. The photosensitive polyurethane film with a surface grating exhibits well-defined and controllable photoresponse characteristics. Its core mechanism lies in the photosensitive monomer responding to light stimulation of a specific wavelength through a dimerization reaction: under ultraviolet light irradiation, the photosensitive monomer in the film undergoes a [2+2] cycloaddition to generate a four-membered cyclobutane dimer. This response mechanism is clear, the triggering path is independent, and the response efficiency is high. It effectively overcomes the limitations of existing coumarin derivatives, which can only achieve self-healing technology. By controlling parameters such as irradiation time and number of irradiations, multi-dimensional information storage can be achieved, significantly improving information storage capacity and stability. This effectively solves the urgent problem of high-capacity information storage in the current field of optical encryption materials, providing a feasible technical path for improving the performance and expanding the practical applications of optical encryption materials.

The present application relates to an optical encryption device, an optical decryption device and an optical encryption communication system, the encryption device comprising: a control unit for generating a control signal based on a pre-encryption protocol; an optical control unit for encoding the plaintext optical signal based on the control signal to obtain the ciphertext optical signal; wherein the encryption protocol is based on the correspondence between the refractive index distribution of the optical control element and the control signal; the optical control element comprises an electrically controllable adjustable scattering medium, the electrically controllable adjustable scattering medium comprises a plurality of tunable anisotropic micro elements, and the refractive index distribution of the electrically controllable adjustable scattering medium can be changed based on the control signal loaded thereon. The system of the present application has good response speed and response accuracy, so as to improve the communication efficiency and communication quality of the communication system under the premise of ensuring the communication security.

The invention relates to the technical field of optical encryption, and discloses a holographic encryption and decryption system based on a neuromorphic optical reserve pools, which comprises a holographic recording subsystem, a neuromorphic optical encryption subsystem and a machine learning decryption subsystem, and is characterized in that the holographic recording subsystem is used for generating an original hologram of a three-dimensional object to be encrypted; the method comprises the following steps: acquiring an original hologram, converting the original hologram into a time sequence holographic signal, inputting the time sequence holographic signal into a neuromorphic optical encryption subsystem, completing nonlinear dynamic encryption of the time sequence holographic signal, generating a ciphertext hologram, inputting the ciphertext hologram into a machine learning decryption subsystem, and recovering a decryption hologram from the ciphertext hologram. The invention further discloses a holographic encryption method based on the neuromorphic optical reserve pool.

This invention relates to a polarization-customized holographic device based on a spin-decoupled plasmonic metasurface, belonging to the fields of micro-nano optics, diffraction optics, and holographic imaging. The device employs a three-layer metal-dielectric-metal reflective structure, consisting of a bottom metal reflective surface, an intermediate dielectric spacer layer, and a top anisotropic metaatomic layer. The top metaatomic layer is composed of various periodically arranged metaatoms. By superimposing the propagation phase and geometric phase, phase decoupling between left-handed circular polarization (LCP) and right-handed circular polarization (RCP) is achieved, allowing independent control of their phase delays. Precise customization of the output linear polarization direction is achieved by adjusting the phase difference between the two. This invention breaks the lock-in relationship between geometric phase and spin state in existing metasurface holographic devices, achieving highly integrated, high-quality polarization-customized holographic imaging. It exhibits stable performance over a wide spectral range and large incident angles, and can be widely applied in optical encryption, secure displays, and optical communications.

This invention relates to the field of image encryption and discloses an optical image asymmetric encryption method based on nonnegative matrix factorization. The encryption method includes the following steps: S1, generating a preliminary encryption result through a first optical transformation based on the original image and a first random phase mask; S2, generating an encrypted result through a second optical transformation based on the preliminary encryption result and a second random phase mask; S3, performing nonnegative matrix factorization on the encrypted result to generate an image matrix and a coefficient matrix; S4, using the coefficient matrix as ciphertext and the image matrix as the private key to complete image encryption. This invention significantly improves the security of optical encryption. It combines nonnegative matrix factorization with double random phase coding to construct an asymmetric encryption mechanism that effectively resists known plaintext, chosen plaintext, and special attacks, while also being robust to cropping and noise interference. The framework is highly scalable and applicable to image and audio data encryption.

The invention discloses a surface enhanced Raman scattering substrate, a preparation method and application thereof, and belongs to the technical field of Raman spectrum detection, and the surface enhanced Raman scattering substrate sequentially comprises a substrate layer, a distributed Bragg reflector, a chalcogenide phase change material functional layer and a nanoscale metal structure layer from bottom to top. The distributed Bragg reflector is formed by stacking periodic structures composed of dielectric materials with different refractive indexes. The distributed Bragg reflector and the nanoscale metal structure layer are coupled to excite the Tamm state, the chalcogenide phase change material functional layer can achieve reversible regulation and control of the amorphous state and the crystalline state under external light excitation, and the Tamm state resonance wavelength is changed to regulate and control the SERS enhancement effect. High-sensitivity detection is realized through dual enhancement of Tamm state and local surface plasmon resonance, and the sensor has the characteristics of non-volatility, reconfigurability, high reproducibility and flexible design, is convenient to operate and stable in performance, and is suitable for the fields of chemical biosensing, laboratory chip systems, optical encryption and the like.

The application provides an optical element, an optical encryption device and an encryption method, and relates to the technical field of optical materials. The optical element is formed by stacking a liquid crystal cell based on a positive nematic liquid crystal layer and a phase retardation plate. By accurately controlling the stacking angle of the stretching direction of the phase retardation plate and the orientation direction of the orientation film, a twisted stacking structure is constructed, so that the optical element has high g lum , a high FOM value, multiple responsiveness and arbitrary patterning capability. In addition, the optical encryption device provided by the application is prepared based on the optical element. Since the optical encryption device includes polymerizable liquid crystal monomers and / or a second fluorescent dye doped in the positive nematic liquid crystal layer, the circularly polarized luminescence generated by the optical element can be adjusted by multiple external stimuli, so that the optical encryption device can be designed by multiple encryption methods, and application requirements in the fields of multi-dimensional data coding, high-level anti-counterfeiting and information encryption can be met.

The invention belongs to the technical field of optical encryption and information security, and particularly provides an optical asymmetric encryption and decryption method and system based on synchronous compressed wavelet transform, and the method comprises the steps: multiplying a to-be-encrypted image by a first random phase mask, encrypting a first modulation image, and obtaining a preliminary encryption result; multiplying the preliminary encryption result by a second random phase mask, and encrypting the second modulation image to obtain an intermediate encryption result; decomposing the intermediate encryption result into sub-blocks with different frequencies through one-dimensional Haar synchronous compression wavelet transform; the high-frequency coefficient in the horizontal direction is stored as a final encryption result, and encryption of the to-be-encrypted image is completed; and storing the low-frequency coefficient, the high-frequency coefficient in the vertical direction and the high-frequency coefficient in the diagonal direction as a decryption key for decrypting a final encryption result. According to the technical scheme, shear attacks, noise attacks, known plaintext attacks, selected plaintext attacks and special attacks can be effectively resisted.

A dual-layer optical encryption fluorescent polymer waveguide chip based on optical pulse code modulation technology belongs to the field of functional photonic chip technology. It consists of a substrate layer, a buffer layer, a cladding layer, a bottom waveguide layer, and a top waveguide layer. The cladding layer is divided into three parts: a lower cladding layer, a middle cladding layer, and an upper cladding layer. The bottom waveguide is located within the middle cladding layer, and the top waveguide is located within the upper cladding layer. The bottom and top waveguides do not overlap in the chip's top-view plane. The waveguide layer material is obtained by doping fluorescent small-molecule oligomer chromophores into a polymer material. This invention achieves signal optical pulse coding by modulating the pump light power intensity. By detecting changes in optical transmission loss in the fiber optic system, it determines whether eavesdropping has occurred. Eavesdropping is indicated by optical transmission loss exceeding a threshold. False information is displayed in the bottom waveguide for disguise, while the modulated information is transmitted encrypted through the top waveguide, thus solving the problems of limited controllability and insufficient security in traditional encryption technologies.

The application discloses a hard film / soft substrate double-layer system material and a synthesis method and application thereof, and the synthesis method comprises the following steps: doping anthracene photosensitizers into a hard film, and coating the hard film on a soft substrate to obtain a hard film / soft substrate double-layer system material. Subsequently, the double-layer system is stimulated by ultraviolet light and / or stretching, and a wrinkle pattern is generated by stretching-release, and the wrinkle pattern will undergo a series of optical changes over time. Compared with a structural color anti-counterfeiting label on the market, the double-layer system not only has bright structural colors, but also has optical behaviors changing over time. The characteristic makes the hard film / soft substrate double-layer system in the application have higher encryption security in optical encryption.

The application relates to the technical field of two-dimensional material exciton regulation, in particular to an optical encryption device based on three-dimensional field exciton regulation of two-dimensional materials and a regulation method. The device comprises a two-dimensional material optical device, which comprises a semiconductor substrate, a ferroelectric material substrate and a II-type heterojunction structure formed by two-dimensional materials; a bias electrode; and a laser assembly arranged on the side of the II-type heterojunction structure away from the semiconductor substrate and spaced apart from the two-dimensional material optical device; a longitudinal bias assembly electrically connected to the bias electrode and the semiconductor substrate and providing longitudinal bias for the II-type heterojunction structure; and a transverse electric field assembly comprising a transverse field electrode arranged on the side of the two-dimensional material optical device and spaced apart from the two-dimensional material optical device and providing external transverse electric field for the II-type heterojunction structure. The optical encryption device can realize regulation of excitons in three dimensions, increase the exciton regulation dimension, and thus improve the encryption complexity and the adjustable degree.

A security platform architecture is described herein. The security platform architecture includes multiple layers and utilizes a combination of encryption and other security features to generate a secure environment.

This invention proposes a multi-channel nanoimprint and holographic display reusable metasurface based on Malus's law and orbital angular momentum. Its structure comprises a silica substrate and a titanium dioxide nanopillar dielectric layer, incorporating a control mechanism for both transport phase and geometric phase. In the near field, the metasurface possesses two linearly polarized dual channels, capable of displaying different images depending on the polarization direction of the incident light. In the far field, it has two OAM holographic channels of different orders, displaying different dot matrix images when OAM vortex light of different orders is incident, thus providing a protective OAM holographic image. The metasurface exhibits high nanopillar utilization, a simple structure, and ease of fabrication, enabling parallel nanoimprint and holographic display using a single nanopillar. This invention significantly advances the application of metasurfaces in information storage, optical encryption, and optical displays, while also providing new possibilities for combining metasurfaces with data encryption.

This application relates to the field of optical encryption technology, specifically disclosing an optical decryption system, a method for fabricating a grating device, and an image processing method. The optical decryption system includes a display panel and a pixelated nanograting device. The display panel displays a ciphertext image, which is formed by encrypting at least two plaintext images. Light emitted from a light source is incident on the display panel. The pixelated nanograting device is disposed on the side of the display panel away from the light source. Light passing through each pixel of the ciphertext image on the display panel is incident on the pixelated nanograting device, then controlled by the pixelated nanograting device before being emitted again, thus displaying each plaintext image on its respective plaintext image plane. This allows the grayscale information of the ciphertext image to propagate to each plaintext image plane according to the controlled vector light field propagation path, reconstructing multiple plaintext images. The number and spatial position of the plaintext image planes can be arbitrarily designed, thereby effectively improving the encryption integration.

The invention relates to the field of image encryption, and discloses an optical image asymmetric encryption method based on non-negative matrix factorization, and the encryption method comprises the steps: S1, generating a preliminary encryption result through first optical transformation according to an original image and a first random phase mask; s2, generating an encryption result through second optical transformation according to the preliminary encryption result and a second random phase mask; s3, performing non-negative matrix factorization on an encryption result to generate an image matrix and a coefficient matrix; and S4, taking the coefficient matrix as a ciphertext, taking the image matrix as a private key, and completing image encryption. According to the invention, the optical encryption security is obviously improved. According to the method, non-negative matrix factorization and double random phase coding are combined, an asymmetric encryption mechanism is constructed, known plaintexts, selected plaintexts and special attacks are effectively resisted, and meanwhile, the method has robustness for shearing and noise interference. The framework is high in expansibility and can be suitable for image and audio data encryption.

This invention belongs to the fields of optical encryption technology and information security technology, specifically providing an optical asymmetric encryption and decryption method and system based on synchronous compressed wavelet transform. The method includes: multiplying the image to be encrypted with a first random phase mask to encrypt a first modulated image, obtaining a preliminary encryption result; multiplying the preliminary encryption result with a second random phase mask to encrypt a second modulated image, obtaining an intermediate encryption result; decomposing the intermediate encryption result into sub-blocks of different frequencies using a one-dimensional Haar synchronous compressed wavelet transform; saving the high-frequency coefficients in the horizontal direction as the final encryption result to complete the encryption of the image to be encrypted; and saving the low-frequency coefficients, the high-frequency coefficients in the vertical direction, and the high-frequency coefficients in the diagonal direction as decryption keys for decrypting the final encryption result. This invention effectively resists shearing attacks, noise attacks, known-plaintext attacks, chosen-plaintext attacks, and special attacks.

The application discloses a kind of photochromic encryption system and its application in optical logic gate encryption, it is related to optical encryption technical field.The photochromic encryption system of the application includes carrier and the encryption information layer being arranged on carrier, the encryption information layer is formed by the combination of the coating area of four different encryption inks, the four different encryption inks are respectively: the mixture of DASA-1 and polyurethane solution;The mixture of DASA-2 and polyurethane solution;The mixture of DASA-3 and polyurethane solution;The mixture of DASA-2 and polystyrene.The photochromic encryption system of the application only needs to realize logic gate control by external light stimulation, without transmitting information by other signal carriers such as electron or other charged particles, compared with the existing logic gate element based on the principle of electronics, the information transmission speed is fast, and it is easier to implement, more conducive to the application of logic gate.

The invention discloses a Si / VO2 double nanorod metasurface dynamic holographic display and optical encryption device and method, and relates to the technical field of metasurface holography, the device comprises a SiO2 substrate and composite metasurface units arranged on the surface of the SiO2 substrate; and the composite metasurface unit is composed of a Si nanorod and a VO2 nanorod. A'static camouflage + dynamic reality 'dual information hiding strategy and a three-level verification mechanism are innovatively designed, and compared with an existing static encryption technology of a single key (polarization / wavelength), the illegal cracking difficulty is improved by three orders of magnitude; a phase compensation scheme is adopted to encode an encrypted image, dynamic phase compensation is introduced through VO2 phase change, composite phase distribution is formed by the dynamic phase compensation and a Si nanorod static phase, and real-time reconfigurable phase modulation which cannot be achieved by a traditional single-material metasurface is achieved. According to a synergistic effect unit structure of the Si / VO2 double nanorods, by accurately controlling geometric parameters and spatial arrangement of the two nanorods, multifunctional integration which cannot be achieved by a traditional single-material metasurface is achieved.

Security feature for a valuable document (200), comprising: a concealment element (110) with optically encrypted machine-readable verification data; a verification element (120) comprising: at least one recording layer (121) transparent in the visible spectral range, a light-deflectoring structure (122), wherein the light-deflectoring structure (122) is arranged on a first side (123) of the recording layer (121); at least one marking (124) which is incorporated into the at least one recording layer (121) and is recognizable by means of the light-deflectoring structure (122) when viewing the verification element (120) from at least one angle of inclination with respect to the field of vision of an observer of the verification element (120), wherein the marking is the decrypted verification data.