135 results about "Optical diffraction" patented technology

Methods, apparatus, devices, subsystems, and systems for holographically displaying three-dimensional objects are provided. In one aspect, an optical device includes: a first optically diffractive component including a first diffractive structure configured to diffract a first color of light having a first incident angle at a first diffracted angle, a second optically diffractive component including a second diffractive structure configured to diffract a second color of light having a second incident angle at a second diffracted angle, a first reflective layer configured to totally reflect the first color of light having the first incident angle and transmit the second color of light, and a second reflective layer configured to totally reflect the second color of light having the second incident angle. The first reflective layer is between the first and second diffractive structures, and the second diffractive structure is between the first and second reflective layers.

The invention discloses an all-optical vortex beam orbital angular momentum mode identification method and system, and relates to the field of optical information processing and optical computing, and the method comprises the steps: S1, constructing a multi-layer architecture all-optical diffraction network; s2, dividing the output detection surface after the diffraction network into a plurality of preset space regions; s3, the vortex light beams carrying orbital angular momentum OAM information sequentially penetrate through the all-optical diffraction network, spatial evolution of a light field in the propagation process is completed, and vortex light classified according to intensity distribution is output; s4, mapping the topological charges of the vortex light to different sub-regions of the detection surface in an intensity distribution form; and S5, performing intensity acquisition on each area on the detection surface through a detector, and determining an OAM mode type of the input light field based on the mode number corresponding to the area with the maximum light intensity. The method is used for performing high-robustness identification on the orbital angular momentum vortex light mode of the vortex light in the presence of a random phase scattering medium.

Methods, apparatus, devices, and systems for displaying three-dimensional objects by individually diffracting different colors of light are provided. In one aspect, an optical device includes: a first optically diffractive component including a first diffractive structure configured to diffract a first color of light having a first incident angle at a first diffracted angle, a second optically diffractive component including a second diffractive structure configured to diffract a second color of light having a second incident angle at a second diffracted angle, a first reflective layer configured to totally reflect the first color of light having the first incident angle and transmit the second color of light, and a second reflective layer configured to totally reflect the second color of light having the second incident angle. The first reflective layer is between the first and second diffractive structures, and the second diffractive structure is between the first and second reflective layers.

The invention belongs to the technical field of optical calculation, and discloses an error-adaptive optical diffraction neural network in-situ training method, which comprises the following steps: based on the phase of each phase modulation layer, calculating the light field complex amplitude Uk of the input sample complex amplitude on the rear surface of each phase modulation layer and the light field complex amplitude Uo of the input sample complex amplitude on an output plane after forward propagation; calculating an error light field P based on Uo, carrying out three-dimensional central symmetry on a back propagation light path of the error light field P without changing the phase distribution of each phase modulation layer, and calculating the light field complex amplitude of the complex amplitude of the symmetrical error light field on the front surface of each phase modulation layer after forward propagation; the method comprises the steps of obtaining the light field complex amplitude Un + 1-k'of P back propagation to the rear surface of each phase modulation layer, calculating the gradient related to a loss function based on Uk and Un + 1-k 'so as to carry out updating, and carrying out the next round of training until a preset training round or loss convergence is reached. The method can adapt to errors existing in an optical system.

The present disclosure relates to the technical field of optical computing, and particularly relates to an intelligent optical computing chip cluster architecture and system. The architecture comprises: a plurality of optical computing chips, and optical path channels are established between the plurality of optical computing chips by using spatial phase adjustment to modulate light beams; and high-speed optical communication and optical diffraction network computing are performed between the plurality of optical computing chips by performing time-domain intensity modulation on the optical path channels. The present disclosure adopting the above scheme can realize the interconnection computing of optical computing chips in the spatial dimension, and does not rely on electricity for information transmission.

The application discloses a kind of low-quality image super-resolution reconstruction methods based on adversarial generative network, including, with the generation dynamic point diffusion function of differentiable optical diffraction calculation layer, and based on the function, wavefront aberration dynamic compensation mechanism is established, wavefront aberration is predicted and compensated, and the low-resolution input feature of optimization is obtained;According to the optimization feature, generator and discriminator are trained using physical constraint adversarial training strategy, and high-resolution image conforming to optical physical law is generated;The diffraction characteristics of high-resolution image are optimized through multi-scale diffraction consistency verification module, to ensure the physical authenticity and consistency of image under different resolutions;The application can effectively handle the complex degradation characteristics of low-quality image, improve the detail quality and optical rationality of generated image.

The invention provides an optical diffraction tomography resolving method, device and equipment, and belongs to the technical field of optical diffraction tomography. The method comprises the following steps: acquiring an off-axis interference image of a target sample; preprocessing the off-axis interference image to obtain a target refractive index distribution diagram; and taking the target refractive index distribution diagram as input, carrying out iterative reconstruction on the refractive index distribution condition of the target sample through a preset algorithm until the difference between a theoretical scattered field calculated based on the refractive index distribution condition and an actual scattered field measured by an experiment meets a preset condition, and obtaining a resolving result diagram, the preset algorithm is generated by combining total variation regularization and a beam propagation method, and is realized by using a GPU (Graphics Processing Unit) under CUDA (Compute Unified Device Architecture). High-precision and high-efficiency recovery of the three-dimensional refractive index of a sample is realized, and the resolving efficiency and accuracy of optical diffraction tomography are improved.

The invention discloses a light field display method and system with holography as a representation medium, and the method comprises the following steps: S1, collecting a multi-view image of a target scene, carrying out the coding of the multi-view image, and generating a light field tensor containing space and angle information; s2, mapping the light field tensor in the step S1 into a two-dimensional space phase diagram; s3, converting the two-dimensional space phase diagram in the step S2 into a modulation diagram used for driving a spatial light modulator; and S4, driving the spatial light modulator to perform light wavefront modulation according to the modulation graph in the step S3, and reproducing the image of the target scene through optical diffraction. According to the invention, integration from dynamic scene information acquisition to high-quality three-dimensional image reproduction is realized, a low-redundancy and high-fidelity processing link is realized, and the efficiency and quality of holographic display are greatly improved.

The invention belongs to the field of molecular sieve material characterization, and particularly relates to a method for analyzing aluminum atom pairs in a ZSM-5 molecular sieve based on super-resolution fluorescence microscopic imaging, which comprises the following steps: activating a ZSM-5 molecular sieve sample; contacting the obtained sample with probe molecules; washing the ZSM-5 molecular sieve sample, and removing unbound or nonspecifically bound probe molecules; imaging the marked sample by using a super-resolution fluorescence microscope to obtain an image sequence containing a single fluorescent molecule emission event; processing the image sequence, determining a space coordinate of each fluorescence event, and reconstructing a super-resolution fluorescence image exceeding an optical diffraction limit; and based on the space coordinates of the fluorescent dots in the super-resolution fluorescence image, carrying out statistics to obtain the position, surface density or distribution information of the aluminum atom pairs in the ZSM-5 molecular sieve. According to the method disclosed by the invention, nanoscale spatial resolution, direct imaging and quantitative analysis of Al-pair in ZSM-5 (Zeolite Socony Mobil-5) can be realized.

According to the method, a cavity black body and a diaphragm hole form an infrared light source, coarse adjustment of a two-dimensional displacement mechanism and fine adjustment of a three-dimensional high-precision displacement mechanism are combined, and an imaging optical system and a narrow-band filter are matched, so that the crosstalk test of a detector with the pixel spacing of 15 microns and below is realized. Through multi-area sampling, multi-band coverage testing and weighted average data processing, the problem that a traditional small-light-spot system is limited by optical diffraction limits is effectively solved, the testing accuracy is remarkably improved, the deficiency of a crosstalk detection method of a small-pixel infrared focal plane detector is overcome, detector evaluation means are enriched, and the detection efficiency is improved. The method is suitable for performance evaluation of infrared imaging system core devices.

The invention relates to the technical field of microscopic imaging, and provides a bimodal imaging system, an imaging method, a device and a storage medium, and the method comprises the steps: generating two laser beams as illumination light and reference light respectively; in the light intensity diffraction tomography mode, lighting light is turned on, the electric diaphragm is turned off to block the reference light, the lighting light passes through an imaging objective lens switched into a low-power objective lens in a first path, and a light intensity diffraction tomography image of the sample is obtained; lighting light is turned on in the optical diffraction tomography mode, an electric diaphragm is turned on to enable the reference light to be propagated along a second path, the lighting light passes through an imaging objective lens switched into a high-power objective lens in a first path, and an optical diffraction tomography image of the sample is obtained; bimodal microscopic imaging is realized based on the light intensity diffraction tomography image and the optical diffraction tomography image; the bimodal imaging system disclosed by the invention is integrated in a set of light path system, and unmarked refractive index imaging of global appearance and local characteristics of a sample can be realized by switching different modes under the control of the subsystem, so that bimodal microscopic imaging is realized.

The invention discloses an ultrahigh space-time resolution detection imaging method and system, and relates to the technical field of optics, and the method comprises the following steps: carrying out the photon space-time dynamic modulation of multi-wavelength short-short pulse laser, and enabling the number of photons in a single-pulse local irradiation field to be in a single-photon / few-photon state; the patterned photons subjected to photon space-time dynamic modulation are distributed and miniaturized to a sample containing fluorescent molecules for double / multi-photon excitation under few-photon irradiation, and double / multi-photon fluorescence is collected; through a high temporal-spatial resolution detection means, spectral information, life information and spatial position information of dual / multiphoton fluorescence are obtained, fluorescence information in a field of view is reconstructed, and super-resolution imaging and positioning of the whole field of view are completed. According to the invention, large-view-field, high-frame-frequency and super-resolution fluorescence detection imaging can be realized, and opportunities are provided for solving the major scientific problem of optical diffraction limit and realizing super-resolution fluorescence microscopy technology innovation.

The invention discloses a space customization three-dimensional column vector light beam array generation method based on a metasurface, and belongs to the field of micro-nano optics, diffraction optics and structured light field regulation and control. The implementation method comprises the following steps of: independently regulating and controlling left-hand circular polarization and right-hand circular polarization components of incident light based on geometric and propagation phase joint modulation of the metasurface; a metasurface, a phase distribution coding lens factor of a polarization channel, a Dammann vortex grating with opposite basic topological charges and a spiral Dammann zone plate are independently optimized, and left-handed and right-handed circular polarization components generate a three-dimensional vortex beam array with opposite spatial topological charges in a near-field Fresnel domain; the left-handed circular polarization vortex array and the right-handed circular polarization vortex array with opposite topological charges are coherently superposed to form a spatially customized three-dimensional column vector light beam array, and the vector characteristic of each light beam in the array depends on the amplitude ratio, the phase difference and the topological charges of the left-handed circular polarization component and the right-handed circular polarization component on each diffraction order. According to the invention, the regulation dimension of the column vector light beam can be expanded.

To provide an optoelectronic device.SOLUTION: An optoelectronic device comprises a plurality of light transmissive regions extending through the device along a first axis and allowing light to pass through. The transmissive regions may be arranged along a plurality of transverse configuration axes. Emissive regions may be positioned between adjacent transmissive regions along a plurality of configuration axes to emit light from the device. Each transmissive region has a lateral closed boundary having a shape to alter at least one characteristic of a diffraction pattern indicated when the light is transmitted through the device to mitigate interference by the pattern. An opaque coating may include at least one aperture defining a corresponding transmissive region to prevent transmission of light which is transmitted through the opaque coating other than through the transmissive region(s). The device can form a face of a user device having a body and housing a transceiver disposed to receive light along at least one light transmissive region.SELECTED DRAWING: Figure 1

The invention provides a double-state interference morphology measurement method and system for a discontinuous precision surface, and belongs to the technical field of optical precision measurement. Based on a Fizeau interferometer, interference images in a focusing state and an out-of-focus state are respectively acquired, two-dimensional structure information and height information of a sample with a discontinuous precise surface are respectively extracted, and two-state data fusion is carried out, so that three-dimensional morphology reconstruction is realized. The method breaks through the limitation of the optical diffraction limit on the resolution, avoids the failure problem of a traditional phase unwrapping algorithm at a discontinuous boundary, remarkably enhances the environmental interference resistance, improves the calculation efficiency, is suitable for high-precision surface measurement of a vacuum chuck and the like with a large number of discontinuous characteristics, and has a wide application prospect. And a reliable solution is provided for high-end manufacturing quality control.

The invention relates to the technical field of microscopic imaging, and discloses a multi-level physical model and double-domain deep learning structured light illumination imaging reconstruction method, which comprises the following steps: firstly, constructing a multi-level physical degradation model based on illumination light field modulation, optical diffraction sensor discrete sampling and photoelectric noise, and generating a simulation data set containing random errors; then constructing a deep neural network containing spatial domain and frequency domain branches, and performing iterative training on the network by using a joint loss function; and finally, acquiring an original structured light stripe image of a real sample, inputting the original structured light stripe image into the trained model to execute end-to-end reasoning, and outputting a super-resolution fluorescent microscopic image. According to the method, the problem of obtaining real pairing training data is solved through physical simulation, high-frequency detail recovery is enhanced by utilizing frequency domain constraint, reconstruction artifacts are effectively removed, the imaging resolution is improved, and the spatial resolution and edge sharpness of a reconstructed image are improved while the ringing effect and background noise are effectively suppressed.

A method for identifying an unknown target in a complex environment by using an all-optical diffraction neural network is characterized in that the adopted all-optical diffraction neural network is composed of multiple layers of phase-type diffraction optical elements, multiple wavefront regulation and control can be performed on a light field corresponding to an input image, and classification and identification of the image are completed in an optical domain after diffraction propagation of a certain distance; on the basis of a diffraction neural network, an anti-interference recognition mechanism is provided, concepts of a target object and an interferent which need to be specifically classified are provided in a diffraction neural network training stage, and a loss function and a constraint condition are set respectively; in combination with a wavelength multiplexing mechanism, different target object classification tasks are independently processed under different wavelength channels, so that classification results of all wavelength channels are integrated in a full-wave band range, the classification task of unknown targets in a complex environment is realized, and the advantages of high speed and low energy consumption of the all-optical diffraction neural network are exerted. The limitations of simple application scene, small target number and the like of the optical neural network are overcome.

Microscopy imaging that allows for multiple mRNAs, proteins and metabolites to be spatially resolved at a subcellular level provides valuable molecular information which is a crucial factor for understanding tissue heterogeneity as for example within the tumor micro environment. The current invention describes a method (High Density-SUMI-Seq) which combines the use of Spatial Unique Molecular Identifier in situ localization and identification (by in situ sequencing or sequential fluorescence hybridization) of rolonies derived from rolling circle amplification of circular oligonucleotides and in vitro sequencing of target amplified RNA or DNA in combination with SUMI identification at a subcellular level with no optical diffraction limitation in the amount of amplified target information that can be analyzed per cell. Apart from amplified RNA or DNA, the High Density-SUMI-Seq method can also be applied using linear oligonucleotides to spatially resolve proteins and metabolites to provide multiomics results.

The invention discloses a multi-wavelength channel diffraction neural network system based on threshold screening and a processing method, and belongs to the technical field of artificial intelligence and optical computing. Comprising an encoding module used for encoding task information corresponding to different to-be-processed tasks to multiple light beams with different working wavelengths output by a light source module to form multiple task channel light fields; the optical diffraction module comprises a plurality of modulation layers; the optical diffraction module is used for receiving the task channel light fields and realizing diffraction modulation and threshold screening of the task channel light fields by changing the metasurface structures on different modulation layers; each task channel light field shares the same set of diffraction modulation parameters, namely parameters such as phase, mask generation and threshold; threshold screening: comparing the mask generation parameter with a threshold parameter, performing binarization selection on the phase parameter according to a comparison result, and screening out a target phase parameter; the output detection module detects the output light intensity. Task channels are expanded, and the system integration degree is improved.

Embodiments herein relate to systems, apparatuses, or processes directed to an integrated optical coupler that may be used to optically couple a waveguide and a PIC. In embodiments, the integrated optical coupler may include an optical diffraction grating mechanism, an optical lens, and a Faraday rotator. In embodiments, the integrated optical coupler may at least partially within a housing. Other embodiments may be described and / or claimed.

The invention provides a multi-site adaptive optical correction method and device applied to a mesoscopic two-photon scanning microscope, and the method comprises the steps: employing a resonance mirror and two galvanometers as a scanning module of a system, dividing a whole imaging view into a plurality of sub-regions, and carrying out the sequential scanning of the sub-regions one by one; a reflective deformable mirror is used as an aberration compensator, and an aberration compensation value is updated in real time; the whole visual field is filled with a regular hexagon, the center and vertex positions of the regular hexagon are set as aberration compensation points, and a reflective deformable mirror is used for carrying out aberration correction on the compensation points in advance; and automatically loading an optical aberration compensation value closest to the center of the sub-region according to the central coordinate position of the sub-region so as to ensure that the image resolution near the optical diffraction limit is kept in the whole view region.

The invention provides silicon carbide substrates and a laser lift-off method for simultaneously processing multiple silicon carbide substrates. The laser lift-off method comprises the following steps: S1, laser is divided into at least two beams of laser after passing through an optical diffraction wafer; s2, at least two laser beams in the step S1 are vertically incident on the surface of the silicon carbide crystal bar; and S3, focal points are formed on focal planes of different depths of the silicon carbide crystal bar through a focusing lens, meanwhile, laser lift-off processing is carried out, and multiple silicon carbide substrates which are processed at the same time are obtained. According to the laser lift-off method for simultaneously processing the plurality of silicon carbide substrates, more than two silicon carbide substrates can be simultaneously processed by one laser, so that the processing efficiency is improved, and the time cost caused by laser lift-off single-chip discharging operation is reduced.

This invention discloses a laser projection display method and system. The method involves configuring the micromirrors of a phase-modulated light device into a high-low periodic structure. Then, based on optical diffraction characteristics, the actual height of the phase-modulated light device under each stage of driving signals is measured. Next, an ideal height set for the micromirrors is defined, which changes linearly with the progressively increasing driving signals. The actual heights that are within a defined error range from the actual heights are identified. These actual heights are matched with the phase level to establish an approximately linear relationship between the driving signal and the changeable phase level. This allows the driving signal to be sent according to the desired linearized height distribution in subsequent designs, achieving an approximately linear adjustment relationship between the change in the actual micromirror position and the change in the ideal micromirror position, thereby improving the dynamic contrast adjustment effect.

The application discloses a kind of super diffraction dark spot microscopic imaging methods based on nonlinear focal spot competition.The application carries out incoherent overlap by different wavelength of hollow light beam in focal point area, and nonlinear absorption competition of excitation photon occurs in the peripheral overlap area of fluorophore of double hollow light beam, finally generates super diffraction dark spot in focal plane, forms stable fluorescent signal in small size signal detection area, and extracts target signal by weak signal lock-in amplification technology.The application breaks through optical diffraction limit, so that it is possible to position the object to be observed in the diffraction limit region with high precision.The system requires low optical power and has high detection sensitivity, and the device structure is simple, suitable for high-resolution observation in the fields of biomedicine, nanomaterials and the like.

The invention belongs to the technical field of photoetching for manufacturing micro-nano devices, and particularly relates to a photoetching alignment system and method based on Morie fringes. The system comprises a template and a substrate, wherein the surfaces of the template and the substrate are respectively provided with coarse alignment marks distributed at four corners and Moire fringe marks distributed at four sides; the illumination imaging unit comprises a camera, a telecentric lens group and a coaxial light source; the displacement mechanism drives the template or the substrate to move. The method comprises the following steps of: coarsely aligning to precision through geometric imaging of a cross mark, overlapping a Morie fringe mark to form a fringe with an amplified displacement effect, calculating deviation through phase analysis, and returning to zero. According to the invention, the optical diffraction limit is broken through, the alignment precision of 10-100 nm is realized, and the complexity and high cost of a traditional interference system are avoided.

The invention relates to a chessboard grating photomask manufacturing precision optimization method. The method comprises the following steps: selecting different photoetching processes according to the product precision requirement; processing the base material according to the selected different photoetching processes, setting the thickness of a chromium layer on the base material, and coating different photoresist layers on the chromium layer according to the different photoetching processes, adjusting and designing the photomask plate patterns according to different photoetching processes respectively; rEG precision compensation of different positions is realized according to different application scenes, and position precision changes caused by different photoetching processes are matched. The invention relates to a checkerboard grating photomask manufacturing precision optimization method, which eliminates the influence of checkerboard grating Dark position disconnection, optimizes the connection position precision, improves the CD and position precision, improves the fillet radius, local customer process compensation and the like, greatly improves the terminal optical diffraction efficiency and uniformity, and improves the optical performance. And the quality and the reliability of the photomask are improved.

A machine vision task, machine learning task, and / or classification of objects is performed using a diffractive optical neural network device. Light from objects passes through or reflects off the diffractive optical neural network device formed by multiple substrate layers. The diffractive optical neural network device defines a trained function between an input optical signal from the object light illuminated at a plurality or a continuum of wavelengths and an output optical signal corresponding to one or more unique wavelengths or sets of wavelengths assigned to represent distinct data classes or object types / classes created by optical diffraction and / or reflection through / off the substrate layers. Output light is captured with detector(s) that generate a signal or data that comprise the one or more unique wavelengths or sets of wavelengths assigned to represent distinct data classes or object types or object classes which are used to perform the task or classification.

The application provides a video image fast clipping and dimension reduction method and system based on a hierarchical bounding box, applied to the technical field of image processing, wherein the method collects multi-view dynamic scene point cloud data, and then divides the space by using a hierarchical bounding box to establish a bounding box structure with density characteristics; subsequently, optical diffraction array pre-filtering is used, and point clouds are separated based on wavelength selectivity and density distribution to generate a first subset and a background subset; then, adaptive pulse code modulation is used on nodes in the first subset to obtain high-precision data, and nodes in the second subset are compressed into low-code-rate data by using run-length encoding; subsequently, the two types of data are input into an improved k-d tree based on the spatial relationship of the bounding box to generate a two-dimensional point set representing key features, and a spatial index is constructed to realize real-time scene retrieval. The application can realize image dimension reduction while retaining key geometric features of the image, thereby improving efficient real-time spatial retrieval in a dynamic scene.

The present invention realizes an optical computation device that can perform high-speed, high-efficiency optical computation. An optical computation device (1) comprises an optical diffraction element group (11) and a lens group (12). Each lens (12a1–12am) of the lens group (12) is positioned such that a point on a specific plane (S0) or a point at infinity and a point on a plane of incidence (S1) for a first optical diffraction element (11a) are substantially conjugate to the lens group (12).

The application is suitable for the technical field of optical devices, and provides an optical assembly, a laser and a laser processing device. The optical assembly comprises, in sequence along an outgoing light direction, a resonant cavity, an optical diffraction element, a frequency doubling crystal and a Q switch. The resonant cavity is used for emitting a light beam. The optical diffraction element is used for homogenizing the light beam. The frequency doubling crystal is used for modulating the frequency of the light beam. The Q switch is used for adjusting the direction of the light beam to control whether the light beam is emitted. The resonant cavity, the optical diffraction element, the frequency doubling crystal and the Q switch in the embodiment of the application are arranged in sequence along the outgoing light direction, so that the stability of the light beam emitted from the Q switch can be improved.