99 results about "Optical encryption" patented technology

The invention provides an optical image encryption method and system based on a partially coherent non-diffracting light beam, and belongs to the technical field of optical encryption and information transmission. Encoding to-be-encrypted image information into the light field cross-spectral density function; the method specifically comprises the following steps: discretizing an image as an expansion coefficient of a power spectral density function at a light source under a pseudo-mode substrate, and constructing a cross spectral density function; a complex amplitude modulation algorithm is adopted to convert light field complex amplitude distribution into a pure phase hologram, the pure phase hologram is loaded to a spatial light modulator, a multi-mode incoherent superposition partially coherent non-diffraction light beam is generated, and the multi-mode incoherent superposition partially coherent non-diffraction light beam interferes with a reference light beam to obtain a light field image; performing coordinate transformation and frequency domain filtering on the light field image to extract a complex coherence degree function; and reconstructing and restoring the original image information in combination with a preset key and a digital inversion algorithm. According to the method, the light beams are constructed based on pseudo-mode superposition, image hidden coding, transmission and decryption are realized by utilizing the characteristics of partially coherent light and non-diffraction light beams, and the method is suitable for optical communication and security information transmission.

The invention discloses a total-space near-far field regulation and control method based on a coherent pixel super-structure surface. The method comprises the following steps: 1) constructing a nano-structure unit and a super-unit; 2) optimizing the structural parameters of the nano-structure unit according to the incident light wavelength lambda, and verifying the regulation and control effects of the super-unit I and the super-unit II; and 3) constructing a nano-structure array, wherein the nano-structure array comprises a plurality of super-units I and super-units II. Left-handed / right-handed circularly polarized light is set to be incident to the surface of the single-layer metastructure, binary nano printing of an image is achieved in a near field, and near-field nano printing intensities in a transmission space and a reflection space are complementary; different holographic patterns are respectively presented in the far-field transflective space, and the far-field transflective channels are regulated and controlled by mutually independent and continuous phases. By properly designing the single-layer nano brick, continuous and independent phase control of reflection and transmission spaces can be realized without additional equipment, far-field holographic imaging and near-field nano printing can be realized, and the single-layer nano brick can be applied to the fields of depth detection, three-dimensional imaging, optical encryption, high-resolution image storage and the like.

The invention discloses a hybrid encryption and decryption method based on a chaotic system and an optical key, and the encryption method comprises the steps: generating a chaotic key through the initial information of a to-be-encrypted object and an initial key, and generating a chaotic sequence for the chaotic key through employing a five-dimensional Hamiltonian conservative chaotic system (FHCCS); scrambling and grouping the initial information according to the chaotic sequence, and selecting a corresponding diffraction distance as an optical key; generating a computer-generated hologram by adopting a layered angular spectrum method according to the diffraction distance; encrypting the computer-generated hologram by adopting the chaos sequence to obtain an optical password book; and encrypting a ciphertext of the optical password book by using the chaotic sequence to obtain a ciphertext of a final encrypted object. According to the method, an encryption mode of combining the optical key and the chaotic key is adopted, and the optical password book inherits the advantages of efficient information storage, high decryption speed, high parallelism and the like of optical encryption, and has the advantages of high shear resistance, high security and the like which are not possessed by a traditional password book.

The invention discloses an intelligent two-dimensional code anti-counterfeiting verification system, and relates to the technical field of anti-counterfeiting, and the system comprises an information coding and encryption module, a phase conversion and encryption module, an optical instruction generation module, a scanning and instruction execution module, and a decryption and verification module. The information coding and encryption module is used for collecting comprehensive information of a product and generating a basic two-dimensional pattern according to a two-dimensional code coding standard. The phase conversion and encryption module is introduced, so that a major breakthrough of a two-dimensional code anti-counterfeiting verification technology is realized, the module can convert key information into phase information, and the phase information is transmitted to the two-dimensional code; according to the optical encryption method, the two-dimensional code is used as a laser source, normalization processing is carried out in combination with laser wavelength, the phase of reflected light in a specific area of the two-dimensional code is changed through a phase mask plate, so that encrypted information is embedded, the security and reliability of anti-counterfeiting verification are greatly improved, normal scanning and reading functions of the two-dimensional code are not affected, and the security and reliability of the two-dimensional code are improved. And a more powerful technical guarantee is provided for product anti-counterfeiting.

The invention provides a metasurface-based method for performing effective phase encoding on incident light at any space angle, and belongs to the technical field of micro-nano optics and integrated photonics. According to the invention, the metasurface atomic displacement is associated with any predefined angle of the space incident light, and the gradient descent algorithm is adopted to optimize the phase matrix, so that effective phase coding in the whole angle space is realized. As a concept verification, the invention shows an omnidirectional angle multiplexing super-structure holography for any space light incidence, successfully realizes an augmented reality holographic image with as many as 22 channels, and proves that meaningful phase coding is realized by any incident angle degree of freedom, and the holographic image has the advantage of high signal-to-noise ratio. The arbitrary full-angle multiplexing holography shows good application potential in practical application aspects such as data storage, virtual / augmented reality and optical encryption.

The invention relates to the technical field of block chains, and provides a food and drug-oriented block chain anti-counterfeiting traceability method and system, and the method comprises the following steps: S1, embedding interference fringes with encrypted information in a color image, and generating an optical encrypted image of a product; s2, dynamically binding the phase mode of the optically encrypted image with the hash value of the product of each block chain node; and S3, verifying the product based on the physical characteristics of the optical encryption image and the dynamic binding relationship between the phase mode of the optical encryption image and the block chain node. According to the invention, the technical problems of easy copying of physical labels, many forbidden scenes, high risk of data tampering, insufficient dynamic anti-counterfeiting capability and lagging of channel conflict detection in food and drug circulation are solved, dual interlocking verification of physical characteristics and digital characteristics is realized, real-time credible tracing of full links of food and drug production, circulation and consumption is ensured, and the product quality is improved. And a safe, reliable, flexible and universal anti-counterfeiting tracing solution is provided for the food and medicine industry.

The invention discloses a degeneracy-based multi-channel image encryption method for a phase change metasurface. Comprising the following steps: 1) designing # imgabs0 # nano bricks which are arranged according to a certain rule and have different sizes and directions on a metasurface to obtain a phase change metasurface with two near-field printing channels and a far-field holographic channel, and performing degeneracy distribution on the two near-field printing channels of the phase change metasurface to realize energy control on the two near-field printing channels; an independent channel is provided for far-field holographic projection by using an improved annealing algorithm and additional degree of freedom given by a Malus law, and dynamic display and switching of a far-field holographic image are realized; and 2) based on the obtained phase change metasurface, optical encryption of the three-channel image is realized by switching the state of the nano brick by utilizing the property of the phase change material. Three information channels are coded on a single phase metasurface by utilizing the flexibility of the multi-channel design and by means of the reversible and adjustable characteristics of the # imgabs1 # nanostructure, so that the information capacity and the safety can be remarkably improved.

The invention provides a collaborative optimization and task processing method and device and an optical encryption system, and relates to the technical field of computational optics, artificial intelligence and the like. The collaborative optimization method comprises the following steps: acquiring a training sample set, and acquiring an initially set optical parameter of an optical module; determining the optical parameter as a target parameter, and executing the following first processing: training a task processing model according to a training sample set and the target parameter; in response to determining that the first end condition is met, determining a reward value according to the target parameter and a newly obtained task processing model, and updating the target parameter according to the reward value based on a reinforcement learning mode; and in response to determining that the second end condition is not met, repeatedly executing the first processing according to the updated target parameter, and in response to determining that the second end condition is met, determining the newly obtained task processing model and the target parameter as a required collaborative optimization result. By means of the scheme, the accuracy of the processing result can be improved.

The invention relates to an anti-counterfeiting and anti-channel conflict system and method for realizing multi-code association by using invisible tagging, and belongs to the technical field of commodity anti-counterfeiting and traceability. Comprising the following steps that S1, a composite image containing a latent code is generated on a commodity identification carrier, and the latent code is fused with an original image through an optical encryption algorithm and needs to be read by special equipment; s2, generating a dynamic corresponding relationship between the anti-counterfeiting code and the hidden code, and establishing a dynamic association rule between the validity state of the anti-counterfeiting code and the physical integrity of the hidden code; s3, dynamically binding the hidden code with the commodity code, the anti-counterfeiting code and the order data in a commodity ex-warehouse stage to form a multi-dimensional association relationship; s4, the associated data is encrypted and then written into the block chain network, a main chain stores a data abstract, and a side chain stores encryption details; and S5, reading the hidden codes through verification equipment, verifying multi-code consistency and regional compliance, and triggering a grading alarm if goods fleeing or tampering exists. The data corresponding relation between the invisible code and the anti-counterfeiting code designated position is achieved, double-layer hiding and dynamic correspondence are achieved, one-product multi-code association is achieved, the counterfeiting threshold and the counterfeiting threshold are further greatly improved, and the inspection easiness is improved.

The invention provides an encryption method based on a metasurface, and belongs to the technical field of optical encryption. A to-be-encrypted pattern is manufactured into a mask after being electronically encrypted, under the action of a light field, the encrypted pattern is coded to a super-structure surface through the mask, the super-structure surface with the linear operation mapping capacity is designed through a reverse design method, and the encrypted pattern is modulated by the super-structure surface and then restored into an original pattern. The metasurface is used for executing the function of decrypting the matrix, the advantages of high integration level, high modulation capability and high design freedom degree of the metasurface are fully utilized, arrangement can be carried out at different spatial positions, encryption combination forms are increased through coupling of the wavelength of a light field and spatial information of the metasurface, the security of the system is improved, and the method is suitable for being applied to the field of encryption. And the information capacity in the encryption process can be improved, and complicated keys do not need to be stored and transmitted.

Embodiments pertain to systems configured to and methods for analyzing a scene comprising one or more objects. The system may be configured to perform the following: obtaining a set of optically encrypted image data describing a scene, including applying an optical manipulation to light incoming to an image acquisition device, whereby the image acquisition device outputs the set of optically encrypted image data, and wherein the optical manipulation is based on an encryption key; providing the set of optically encrypted image data to a machine learning model trained in accordance with the encryption key; and receiving from the machine learning model a prediction related to the scene.

The invention discloses a dual-state six-channel polarization multiplexing metasurface design method based on a phase change material. The method comprises the following steps: designing a structural unit based on the phase change material; a double-state six-channel polarization multiplexing metasurface is constructed by using the designed structural unit; the geometric structures and the orientation angles of the structural units are optimized by adopting a screening algorithm, and the optimized double-state six-channel polarization multiplexing metasurface can record six kinds of irrelevant phase information into the same double-state six-channel polarization multiplexing metasurface. The method is based on the metasurface Jones matrix regulation and control theory, comprehensively utilizes the geometric phase and the transmission / resonance phase of the structural unit, is suitable for most types of metasurface unit structures, has wide applicability, can be applied to the fields of metasurface optical encryption, multifunctional wavefront regulation and control and the like, and has important practical value.

The invention relates to the technical field of optical encryption, and discloses a photosensitive polyurethane film with a surface relief grating pattern and a preparation method and application thereof.The method comprises the steps that in an ice bath and inert atmosphere, toluene diisocynate and a dihydropyridine photosensitizer monomer are added into N, N-dimethylformamide, and a mixture is obtained; the preparation method comprises the following steps: adding the raw materials into a mixed solvent of N, N-diethyl formamide and dimethyl sulfoxide, and then dropwise adding 1, 4-dibutanol; removing the ice bath, and reacting at the temperature of room temperature to 60 DEG C to obtain a photosensitive polyurethane solution; spin-coating the photosensitive polyurethane solution on a substrate, and drying to obtain a photosensitive polyurethane film; and exposing the designed mask plate on the surface of the photosensitive polyurethane film. According to the invention, the non-covalent interaction difference of the polymer-dihydropyridine / pyridine part can be constructed to realize effective surface patterning, and the generation of a two-dimensional ordered grating-shaped wrinkle structure with a sinusoidal phase is realized on the surface of the polyurethane film in a wrinkling manner in combination with an optical anti-counterfeiting technology, so that pattern anti-counterfeiting is realized.

The invention provides an information transmission multiple encryption and decryption method and system based on a random light field, and relates to the technical field of optical encryption, and the method comprises the steps: encrypting plaintext information and multiple secret keys into a coherent structure of the random light field, and synthesizing the random light field carrying ciphertext information and secret key information through employing a complex amplitude coding algorithm; performing far-field transmission on the synthesized random light field; measuring a coherent structure of a transmitted random light field by using a phase perturbation method, and decrypting information encrypted in the random light field in a far field through inverse transformation in combination with a decryption key; the existing optical encryption technology is expanded by utilizing optical coherence engineering, the development of an optical encryption system for high-security information storage and transmission is promoted, and the application of the optical coherence engineering in high-security optical communication and quantum information is stimulated.

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 a security authentication optical encryption and decryption method based on computational correlation imaging and related equipment, and relates to the technical field of image information security. According to the encryption method, a to-be-transmitted image and a to-be-authenticated image are independently coded into two intensity point sequences by respectively using CGI systems with different propagation distances; the two different sequences of intensity points are then combined to produce a ciphertext, wherein the sequence of intensity points obtained from the image to be transmitted occupies a large proportion. The decryption method reconstructs an image to be transmitted and image information to be authenticated by using reference intensity speckle sequences and ciphertexts obtained at different propagation distances, respectively. According to the method, the user is allowed to perform security authentication on the ciphertext, clear information cannot be observed in the process of recovering the to-be-authenticated image, the to-be-authenticated image information is ensured not to be leaked in the transmission process, and the high security of the optical encryption system is ensured.

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 invention relates to the technical field of optical encryption, and discloses a thermal control optical encryption method, device and equipment, a storage medium and a computer program product, and the method comprises the steps: transmitting terahertz light waves in a specific frequency range to a terahertz metasurface when confidential information and an encryption demand are received, and obtaining a first terahertz signal; adjusting the temperature of the terahertz metasurface according to an encryption requirement, and collecting a second terahertz signal generated after the first terahertz signal is modulated by the terahertz metasurface based on an adjustment result; and generating an original password according to the first terahertz signal and the second terahertz signal, and encrypting the confidential information through the original password to obtain encrypted data. The transmission rate of terahertz light on the metasurface is changed through accurate temperature control, rapid modulation of terahertz signals is achieved, encryption of optical information is completed according to the modulation result, and encryption flexibility and security are greatly improved.

The invention discloses a bionic circular dichroism optical encryption device based on a tiger structure, and the device comprises a first substrate, a first conductive layer, a first electrode patch, an information encryption layer, a second conductive layer, a second electrode patch, and a second substrate. Wherein the information encryption layer adopts a double-layer Z-shaped structure design to simulate a tiger function, an upper layer fixing structure corresponds to a left half tiger of a palm tube, and a lower layer dynamic rotating structure corresponds to a right half tiger held by a user. A ciphertext transmission system is constructed by regulating and controlling three key parameters of an inclination angle, a rotation angle and an electromagnetic wave incidence angle of the lower layer structure, and steganography information can be accurately decrypted by using a specific CD key only when the three key parameters meet preset matching conditions at the same time. According to the invention, the dynamic adjustable circular dichroism (CD) is innovatively realized, and an optical security system for information encryption is constructed through the bionic design of key matching.

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 invention discloses a multi-optical characteristic composite film and a blending pouring preparation method, and belongs to the technical field of optical encryption and anti-counterfeiting. According to the method, polyvinylpyrrolidone (PVP), sorbitol and polyethylene glycol (PEG) are introduced to serve as dispersing agents to play a coating role on SiO2 and CNC, so that the compatibility of SiO2 and CNC is improved, the SiO2 can form a homogeneous film after coating due to the fact that the refractive index of the dispersing agents is similar to that of SiO2, and therefore the transparency of the film is improved; good dispersibility and high transparency enable SiO2 in the composite film to present gorgeous iridescent color. The obtained composite film shows the structural color of a CNC photon layer under natural light, shows the bright structural color of CNC under natural light, shows the SiO2 structural color with a dynamic change effect under a point light source, shows the structural color and fingerprint texture texture of CNC under a super depth-of-field microscope, and shows the birefringence color of CNC under a polarizing microscope. The film with multiple optical characteristics has great application potential in the fields of optical anti-counterfeiting, information encryption and the like.

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.

The invention discloses a photochromic core-shell structure organic metal silicon nano composite material and preparation and application thereof, and the composite material is prepared by the following method: under a heating condition, respectively preparing a platinum (II) complex Pt-AP and a spiropyrane derivative SP-AP; the preparation method comprises the following steps: under a room temperature condition, taking tetraethoxysilane as a silicon dioxide precursor, adding Pt-AP into an alkaline solution of ethanol and water, and reacting to obtain core silicon dioxide nanoparticles Pt-SiO2; and then carrying out resuspension, adding a surfactant, SP-AP and tetraethoxysilane, and carrying out a reaction to obtain the photochromic organic metal silicon nano composite material with the core-shell structure. The preparation process is simple, purification is easy, the obtained photochromic composite material and the nanofiber film have reversible response to ultraviolet light and visible light, and the high-performance and multifunctional dynamic optical encryption effect can be achieved.

The invention discloses a multi-image narrowband display and encryption method based on an F-P cavity integrated metasurface. According to the method, two metasurface structures with different sizes are integrated above an F-P cavity with proper cavity length and thickness, so that the device is endowed with a dual-band narrow-band transmission filtering characteristic, and independent regulation and control on amplitude and polarization are realized under respective resonant wavelengths. Specifically, the two metasurface structures present a significant polarization-independent transmissivity difference at a wavelength 1, and present as a quarter-wave plate with a polarization conversion function at a wavelength 2. An array is constructed based on the device, and three different binary images (images 1, 2 and 3) can be encrypted and hidden in the structural array by using the dual-band narrow-band filtering and the amplitude and polarization regulation and control characteristics of the device. Wherein the gray value of the image 1 determines the size of the metasurface structure at any position, and the image 2 and the image 3 determine the rotation angle of the metasurface structure at the position. Specifically, under the wavelength 1, right-handed circularly polarized light is incident, and an encrypted image 1 can be observed; under the wavelength 2, right-handed circularly polarized light is incident and detected by polarization analyzers with polarization angles of 0 degree and 45 degrees respectively, and the encrypted image 2 and the encrypted image 3 can be observed. Due to the dual-band narrow-band filtering characteristic of the method, a clear image cannot be observed under a non-filtering wavelength, and the security of metasurface optical encryption 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.