106 results about "Polarization sensitive" patented technology

A machine vision system may include a meta-imager including a meta-optic and a polarization-sensitive photodetector. A machine vision system may further include and at least one processor operably coupled to the polarization-sensitive photodetector, and at least one memory operably coupled to the at least one processor. A machine vision system may be configured to: receive, from the polarization-sensitive photodetector, a plurality of feature maps; input, into a trained artificial neural network, the plurality of feature maps; and process, using the trained artificial neural network, the plurality of feature maps to recognize an object.

The invention belongs to the technical field of radar signal processing, and discloses a radar scattering rapid test method based on polarization decomposition. Comprising the following steps: scanning a target 3D model, simulating scattered field distribution in different incident angles and polarization modes, calculating polarization contrast, and identifying a polarization sensitive area; establishing a dynamic coordinate system conversion model, fusing RTK data, IMU data and laser tracking data, and correcting the position of the trolley and the model in combination with a Doppler frequency shift model and a least square method; calculating an optimal test path of the trolley according to the sensitive area by adopting a natural heuristic optimization algorithm; establishing a geometric environment model, obtaining a back scattering signal through beam forming, analyzing a polarization coherence matrix, obtaining a high-entropy region, and decomposing scattering components; according to the method, closed-loop optimization is formed from a data acquisition source to a scattering component analysis tail end, and the test efficiency and the real-time performance are remarkably improved.

This disclosure relates generally to a composite reconfigurable intelligent surface system for real time beam steering and method thereof. Conventional method for real time beam steering includes bulky systems with several antenna elements and amplifiers to shape and control the beam. The present disclosure provides a composite reconfigurable intelligent surface (CRIS) for real time beam steering. The CRIS is formed from a set of constituent reflecting surfaces which in turn are generated from unit cells. These unit cells are responsible for providing individual phase reflection performance utilizing the installed varactor diode in each unit cell. The CRIS can provide a) multi-beam reflection performance, b) polarization sensitive operation, c) 2D beam steering abilities, d) real-time beam control, e) null point reduction for beam shaping requirements and f) dependable pattern stability over a suitable range of frequencies.

This disclosure relates generally to a composite reconfigurable intelligent surface system for real time beam steering and method thereof. Conventional method for real time beam steering includes bulky systems with several antenna elements and amplifiers to shape and control the beam. The present disclosure provides a composite reconfigurable intelligent surface (CRIS) for real time beam steering. The CRIS is formed from a set of constituent reflecting surfaces which in turn are generated from unit cells. These unit cells are responsible for providing individual phase reflection performance utilizing the installed varactor diode in each unit cell. The CRIS can provide a) multi-beam reflection performance, b) polarization sensitive operation, c) 2D beam steering abilities, d) real-time beam control, e) null point reduction for beam shaping requirements and f) dependable pattern stability over a suitable range of frequencies.

An anamorphic directional illumination device may provide a near-eye display apparatus or a vehicle external light device. The anamorphic near-eye display apparatus comprises a spatial light modulator with asymmetric pixels; an input transverse anamorphic lens; and an extraction waveguide that passes input light in a first direction between a polarization-sensitive reflector and front guide surface to a lateral anamorphic reflector, and to reflect the light back through the extraction waveguide to guide between the rear guide surface and front guide surface. Reflective extraction features are arranged to extract the reflected light towards the pupil of a viewer, maintaining the directionality of the fan of light rays from the spatial light modulator and anamorphic imaging system. A thin, transparent and efficient anamorphic display apparatus for Augmented Reality and Virtual Reality displays and for scene illumination is provided.

The invention relates to the field of array signal processing, and particularly discloses a DOA joint estimation method based on a quaternion polarization sensitive array. Electromagnetic wave dual polarization components are captured through the orthogonal dipole and the loop antenna, and a quaternion observation matrix is constructed; calculating a quaternion covariance matrix by adopting a sliding window mechanism, and separating a signal / noise subspace by adopting quaternion singular value decomposition; and constructing a spatial spectrum function in combination with a quaternion steering vector, and realizing joint estimation of an azimuth angle and a pitch angle through two-dimensional search. According to the method, the unified characterization capability of quaternions on polarization-airspace information is fully utilized, and the DOA estimation precision and the anti-interference performance of the multi-polarization signal are remarkably improved.

The invention provides a self-powered polarized photoelectric detector, a preparation method thereof and a method for regulating and controlling the polarization ratio of the self-powered polarized photoelectric detector. The structure of the self-powered polarized photoelectric detector comprises a conductive substrate layer, a two-dimensional perovskite ferroelectric film layer, a semiconductor material layer and a metal top electrode layer from bottom to top. The two-dimensional perovskite ferroelectric film layer and the semiconductor material layer can form a heterojunction with polarization property. Different polarization voltages are applied to the polarization photoelectric detector, the intensity of an electric field built in the two-dimensional perovskite ferroelectric film heterojunction is regulated and controlled, and the polarization ratio of the polarization sensitive photoelectric detector is dynamically regulated and controlled. The invention provides a convenient method for dynamically regulating and controlling the polarization ratio of the polarization sensitive photoelectric detector by using a ferroelectric-pyroelectric electro-optical electronic effect, and the regulation and control of the polarization ratio are realized on the same polarization device.

Provided is an optical communication system comprising a polarization-diversity optical power supply capable of supplying light over a non-polarization-maintaining optical fiber to a polarization-sensitive modulation device. In an example embodiment, the polarization-diversity optical power supply operates to accommodate random polarization fluctuations within the non-polarization-maintaining optical fiber and enables an equal-power split at a passive polarization splitter preceding the polarization-sensitive modulation device.

Polarization-insensitive metasurfaces using anisotropic nanostructures are disclosed. These anisotropic structures allow for an accurate implementation of phase, group delay, and group delay dispersion, while simultaneously making it possible to realize a polarizationinsensitive, diffraction-limited and achromatic metalens for wavelength, e.g., λ=from about 460 nm to about 700 nm. The approach of polarization-insensitivity can be also applied for other metasurface devices with applications in, e.g., imaging and virtual or augmented reality.

The invention belongs to the field of photoelectricity, and particularly relates to a plasmon polarization sensitive detector based on a micro-nano structure. The innovation points are as follows: (1) the light absorptivity of molybdenum disulfide is enhanced by utilizing an electric field generated by a local surface plasmon effect; and (2) the detection of the molybdenum disulfide photoelectric detector on polarized light is realized. According to the main implementation scheme, a graphical gold nanostructure is transferred to molybdenum disulfide, so that detection of the molybdenum disulfide on polarized light is realized; the surface electric field of the molybdenum disulfide is further enhanced through the localized surface plasmon effect generated when the gold nano array is excited, so that the carrier generation rate of the molybdenum disulfide is increased. Compared with a traditional molybdenum disulfide photoelectric detector, the device can detect polarized light, and meanwhile, the absorption rate of molybdenum disulfide to visible light (0.38-0.7 mu m) is enhanced to a certain extent, so that the application scene is greatly widened, and the application range is greatly widened.

The invention discloses a polarization sensitive type broadband absorber based on metal-medium stacking, and relates to the technical field of micro-nano photonic devices and infrared detection. The absorber sequentially comprises a bottom-layer high-loss metal reflecting layer, a multi-layer stacked composite dielectric cavity structure and a top-layer sub-wavelength metal grating from bottom to top, according to impedance matching and interference resonance theories, a broadband absorption substrate is constructed through a multi-layer film structure at the bottom, and light energy is converted into heat energy by utilizing the high loss characteristic of bottom layer metal; plasmon resonance is excited through the top metal grating, the coupling efficiency of TM polarized light is enhanced, and TE polarized light is cut off; the above structural design successfully realizes efficient broadband absorption and high polarization extinction ratio in an infrared band. The structure is simple in design, is compatible with a CMOS technology, and has excellent wide-angle stability. And meanwhile, polarization screening can be realized without an external polaroid, and miniaturization and integration of an infrared detection system are facilitated.

The invention discloses a two-dimensional Te / ReSe2 variable-angle heterojunction photoelectric detector and a preparation method and application thereof, and belongs to the technical field of semiconductor devices. The two-dimensional Te / ReSe2 variable-angle heterojunction photoelectric detector sequentially comprises a Si / SiO2 substrate, a Te layer and a ReSe2 layer from bottom to top, and the ReSe2 layer and the Te layer form Van der Waals heterojunctions with different angles. Through a CVD method, PMMA wet transfer, PVA dry transfer, photoetching gold plating, high-temperature annealing treatment and other methods, customization of functions of the photoelectric detector is realized, and a multi-angle heterojunction device with rich polarization characteristics is obtained. Based on different polarization sensitive characteristics of devices, the functions of simultaneous detection of polarized light direction and intensity of incident light, encryption and decryption and polarization imaging can be realized.

The invention relates to a four-dimensional imaging device and method based on a binocular polarization sensitive super-structure lens, and the device can comprise a binocular polarization sensitive super-structure lens device which comprises two monocular polarization sensitive super-structure lenses; the monocular polarization sensitive super-structure lens represents a monocular super-structure lens capable of separating different polarization components in incident light; wherein each monocular polarization sensitive metamaterial lens comprises a substrate and a unit structure array distributed on the substrate, the unit structure array comprises a plurality of anisotropic unit structures, and the distance between any two unit structures is smaller than a preset working wavelength; the image sensor is used for receiving the transmission light passing through the binocular polarization sensitive super-structure lens device and generating a target image, and the target image is used for extracting three-dimensional space information and polarization information at the same time. The device is small in size, light in weight and low in complexity, can be conveniently integrated into various application scenes, and can realize depth perception and polarization detection at the same time.

The invention belongs to the technical field of electronic components, and relates to a photoelectric transistor, in particular to a polarization sensitive photoelectric transistor with a MoS2 / In2Se3 heterojunction as a conducting layer. The MoS2 / In2Se3 heterojunction phototransistor comprises a Si / SiO2 substrate, a semiconductor MoS2 nanosheet, a semiconductor In2Se3 nanosheet, a source electrode and a drain electrode, the MoS2 nanosheet and the In2Se3 nanosheet form a vertical heterojunction located on the substrate, and the source electrode and the drain electrode are located at the two ends of the MoS2 / In2Se3 heterojunction. According to the invention, the MoS2 / In2Se3 heterojunction structure with intrinsic anisotropy is adopted to carry out polarized photoelectric detection, complicated optical components such as an additional optical polarizer and an optical filter are not needed, and the problems that a traditional polarized photoelectric detector is complicated in structure and cannot be integrated are solved; the two-dimensional material heterojunction with excellent photoelectric property is used as the conductive layer, so that the power consumption of the phototransistor is effectively reduced.

The invention discloses a polarization-sensitive narrow-band solar blind self-driven photoelectric detector and a preparation method thereof, and belongs to the technical field of semiconductor photoelectric devices. The detector comprises an n-type conductive single Ga2O3 micron wire, a p-type conductive GaN substrate, a PET substrate and a two-dimensional graphene film. According to the device, Ni / Au alloy is selected as a positive electrode, and a two-dimensional graphene film is used as a transparent window of ultraviolet solar blind light and a negative electrode of the device. By means of built-in potential formed by the n-Ga2O3 / p-GaN heterojunction and a Schottky barrier of Ga2O3 / Graphene, high-sensitivity detection of solar-blind ultraviolet light under the self-driving condition is achieved. The device has relatively high responsivity, specific detection rate and external quantum efficiency. The preparation method comprises the following steps: cleaning the GaN substrate, evaporating the Ni / Au electrode, adhering the PET substrate with the channel, transferring the Ga2O3 micron wire to form the heterojunction, and transferring and curing the graphene electrode. The device has the characteristics of polarization sensitivity and low power consumption, and can be applied to the fields of ultraviolet solar blind band encryption communication and environment monitoring.

A method and system for determining a radiation dose is provided. The method can include receiving at least one polarized signal from a radio-luminescent element and determining a degree of linear polarization and an angle of linear polarization of the at least one polarized signal based on at least one predetermined polarization transmission axis. The system can include a polarization sensitive sensor for capturing at least one polarized signal from a radio-luminescent element; and a processor. The processor can be configured to: receive the at least one polarized signal; and determine a degree of linear polarization and an angle of linear polarization of the at least one polarized signal based on at least one predetermined polarization transmission axis.

The application provides an orbital angular momentum and wavelength dual multiplexing polarization sensitive zooming super lens based on an orbital angular momentum and wavelength dual multiplexing polarization sensitive zooming super lens, characterized in that the super lens is composed of a silicon dioxide substrate layer and a silicon elliptical nanometer column medium layer. Through an orbital angular momentum topological charge number orthogonality and wavelength selectivity dual multiplexing mechanism, combined with a polarization sensitive design, a geometric phase regulation mechanism, the silicon elliptical nanometer column array is optimized through size and rotation angle, 0-2pi full phase coverage is realized, different orbital angular momentum modes, different wavelengths and left-handed / right-handed circularly polarized incident light are precisely demultiplexed in a 400-700nm visible light band, multi-channel independent zooming can be realized, and the focusing efficiency is greater than or equal to 65%. The application solves the defects of single zooming function, limited channel capacity and poor polarization compatibility of the traditional super lens, has compact structure and high integration, and can be widely applied to the fields of miniature imaging systems, optical communication, holographic display and the like.

In certain embodiments, an ophthalmic diagnostics system includes a polarization sensitive optical coherence tomography (PS-OCT) device. The system also includes a memory having executable instructions. The system also includes a processor in communication with the memory and configured to execute the instructions to cause the PS-OCT device to emit polarized light to a measurement location on eye tissue of a patient and generate PS-OCT data based on the polarized light. The processor is further configured to execute the instructions to determine birefringent information for the measurement location based on the PS-OCT data and to determine biomechanics information for the measurement location based on the PS-OCT data. The processor is further configured to execute the instructions to determine a correlation between at least a portion of the biomechanics information and at least a portion of the birefringent information.

The invention relates to a two-dimensional DOA and polarization parameter estimation method based on a polarization sensitive parallel array. The method comprises the following steps: determining parameters of the polarization sensitive parallel array according to the total number of array elements; designing a separated polarization sensitive sparse array according to the polarization sensitive parallel array parameters determined in the step 1; based on the separated polarization sensitive sparse array, a virtual area array is deduced by combining the motion of the array along the normal direction of the array; on the basis of the obtained virtual area array, the degree of freedom of the virtual area array in a differential common array domain of a space domain-polarization domain is solved; and based on the virtual area array, deducing a multi-dimensional parameter estimation algorithm based on ESPRIT according to a virtual array structure, taking the solved degree of freedom as an upper limit of a maximum estimable signal source number of the parameter estimation algorithm, and obtaining two-dimensional DOA and polarization parameter estimation of each signal by using the parameter estimation algorithm. Compared with the prior art, the array has the characteristics of low mutual coupling, high degree of freedom and large aperture, and the parameter estimation method has the advantages of low complexity, automatic parameter matching and the like.

The present invention belongs to the field of radar signal processing technology and discloses a rapid radar scattering test method based on polarization decomposition. The method comprises the following steps: scanning a 3D target model, simulating scattering field distributions under different incident angles and polarization modes, calculating polarization contrast, and identifying polarization-sensitive areas; establishing a dynamic coordinate system conversion model, fusing RTK data, IMU data, and laser tracking data, and correcting the vehicle position and model by combining a Doppler frequency shift model and a least squares method; using a nature-inspired optimization algorithm to calculate the vehicle's optimal test path based on sensitive areas; establishing a geometric environment model, obtaining backscattered signals through beamforming, analyzing a polarization coherence matrix, obtaining high-entropy areas, and decomposing scattering components. The method forms a closed-loop optimization from the data acquisition source to the scattering component analysis end, significantly improving test efficiency and real-time performance.

A system for visualizing a target site in an eye using a polarization sensitive optical coherence tomography (PS-OCT) device includes a controller having at least one processor and at least one non-transitory tangible memory on which instructions are recorded. The target site is one or more vitreous opacity in vitreous fluid of the eye. The controller is configured to receive the PS-OCT data and determine, based on the PS-OCT data, at least one parameter corresponding to a birefringence characteristic of collagen fibrils in the vitreous humor. The at least one parameter includes a respective pitch of collagen fibrils. The controller is configured to determine a respective location of the one or more vitreous opacity when the at least one parameter exceeds a predefined range, and to generate a control signal adapted to direct the treatment beam at the respective location of the one or more vitreous opacity.

An optical construction includes an optical film between first and second prismatic films, which each include pluralities of parallel, linear first and second prisms. Each of the first and second prisms have opposing first and second sides extending from first and second ends of a base of the prism and meeting at a peak. The first and second sides make first and second base angles with the base of the prism. The peaks of the prismatic films face away from each other and the optical film. For a collimated, normally incident light, for at least a first wavelength in a first wavelength range, and for each of first and second polarization states: the optical film has an optical transmission of less than about 1%, and the optical construction transmits at least 1% of the incident light at an oblique angle greater than 5 degrees with respect to the optical film.

The present disclosure provides a polarization sensitive eye authentication system. A system for authenticating a user includes a light source for emitting polarized light, a polarization sensor, and processing logic. The system may cause a light source to illuminate an eye of a user with polarized light, cause a polarization sensor to capture an image of the eye to collect polarization characteristics specific to the eye when illuminated by polarized light, and compare the polarization characteristics to previously collected polarization characteristics to authenticate the user.

A fiber scanning projector includes a piezoelectric element and a scanning fiber passing through and mechanically coupled to the piezoelectric element. The scanning fiber emits light propagating along an optical path. The fiber scanning projector also includes a first polarization sensitive reflector disposed along and perpendicular to the optical path. The first polarization sensitive reflector includes an aperture and the scanning fiber passes through the aperture. The fiber scanning projector also includes a second polarization sensitive reflector disposed along and perpendicular to the optical path.

The application discloses a polarization-sensitive wide-angle matching structure and an ultra-wideband wide-scan-angle low-standing-wave tight-coupling antenna. The polarization-sensitive wide-angle matching structure comprises a first polarization-sensitive structure medium substrate, a first polarization-sensitive structure, a second polarization-sensitive structure medium substrate, a second polarization-sensitive structure, a third polarization-sensitive structure, an isolation layer and a wide-angle matching layer. The application adopts three layers of wide-angle matching structures with different shapes along the E plane and the H plane of the antenna, can improve the impedance matching conditions in two scanning directions according to different impedance change rules when the tight-coupling array is scanned along the E plane and the H plane, and realizes a lower active standing wave under a large scanning angle.

The invention discloses a dual-polarization microwave energy efficient receiving composite metasurface array and a receiving method, and the method comprises the steps: enabling different polarization plane waves to irradiate a polarization selective waveform conversion function region composed of biaxial symmetric split-ring resonators, and carrying out the unit differential response and reflection phase gradient arrangement, converting the x-polarized plane wave and the y-polarized plane wave into surface waves propagating in the-x direction and the y direction respectively; the square ring-shaped artificial surface plasmon polariton structure is used for receiving the surface wave, and the surface wave is stably guided to the waveform focusing and energy extraction functional area through momentum matching; by means of gradient refractive index distribution focusing surface waves of a planar semi-Maxwell fisheye lens, an equiphase surface is bent into a spherical surface shape, and energy is converged to a focus; energy is led out through the microstrip line structure at the focus, efficient transmission is achieved through impedance matching, and collection and conversion of different polarization microwave energy are completed. The polarization sensitivity problem of a traditional scheme is solved, and the microwave energy collection efficiency is improved.

This invention relates to a method for measuring the depolarization of a medium in intravascular polarization-sensitive optical coherence tomography (ICP-CT), comprising: setting the polarization state of the input light of a catheter polarization-sensitive optical coherence tomography system; setting the reference light in the H and V channels of the input light and the reference light in the system to have equal intensity; acquiring the electrical signals measured at the polarization diversity point in the form of a Jones matrix to obtain the average measurement Mueller matrix; calculating the standard deviation matrix of the reference region; obtaining the depolarization Mueller matrix of the reference region; extracting the block matrix of the average measurement Mueller matrix of the reference region; calculating the average double attenuation block matrix of the reference region; constructing the average double attenuation matrix of the reference region; obtaining the pseudo-average birefringence phase delay matrix of the reference region; extracting the average depolarization matrix of the reference region from the pseudo-average birefringence phase delay matrix of the reference region using matrix decomposition; obtaining the depolarization Mueller matrix of the target region; and calculating the medium depolarization coefficient.

An imaging device for capturing an image of a scene comprises a polarization sensitive interferometer whose input light spans a wavelength range, and which is configured to output polarization specific interfered light, and which comprises an image sensor configured to capture the image based on the output polarization specific interfered light for reconstructing the color spectrum of the scene.

The invention discloses a method for eliminating autocorrelation artifacts of a polarization sensitive optical coherence tomography image. Comprising the following steps: carrying out sample detection by using a PS-OCT (Polarization Sensitive Optical Coherence Tomography) system to obtain interference signals of two polarization channels; performing inverse Fourier transform on the interference signal of one channel to obtain an airspace signal of the interference signal; finding a self-correlation horizontal fringe artifact signal with the maximum intensity in the interference signals of the airspace, and setting the intensities of other positions to be zero; calculating an unwrapping phase of the self-correlation artifact in each A-scan, and taking a minimum value of the unwrapping phase as a reference phase; interpolating the spectral phases of the original interference signals of the two polarization channels according to a reference phase; and performing inverse Fourier transform and polarization parameter calculation to obtain an OCT intensity image and a polarization image with autocorrelation artifacts eliminated. According to the image phase information-based self-correlation artifact removal method, the self-correlation artifacts in the PS-OCT image can be effectively eliminated, additional hardware facilities do not need to be introduced, and the method is simple and effective.