54 results about "Polarization sensitive" patented technology

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 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 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.

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.

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.

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.

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.

Integrated optical circulators that enable polarization diversity are disclosed. A photonic integrated circulator (200) can be fabricated by including multiple polarization beam splitters (220, 222) and optical polarization rotators (230, 232, 234) such that two copies of an optical signal are output at a receiver in substantially aligned polarization states. The circulator (200) can be used to facilitate bidirectional communication between photonic integrated circuit devices that are inherently polarization sensitive while reducing signal loss.

The invention relates to a method for reducing noise and decoupling local birefringence of intravascular polarization sensitive coherence tomography. The method comprises the following steps: acquiring a measurement Mueller matrix from a catheter polarization sensitive optical coherence tomography PS-OCT system; determining a reference measurement Mueller matrix; acquiring a global Mueller matrix; obtaining a medium depolarization moment according to a medium depolarization extraction method; calculating a pseudo-depolarization-free matrix; obtaining a noise depolarization matrix; calculating a standard deviation matrix for the noise depolarization matrix; obtaining a phase delay initial value delta0; generating a test noise depolarization matrix; generating a noise reduction global Mueller matrix; calculating a local Mueller matrix; calculating a local birefringence; and performing traversal calculation to obtain a local birefringence two-dimensional polar coordinate distribution diagram.

This invention discloses a high-precision angle measurement method for polarization-sensitive array radar under aperture constraints. The invention consists of two parts: array synthesis error correction and virtual aperture expansion angle measurement. Array synthesis error correction jointly models various array errors present in engineering implementation and theoretically proves that the matrix bundle generated based on the measured steering vectors of two different polarization correction sources is equivalent to the matrix bundle generated based on the real steering vector (having the same generalized eigenvalues), thus achieving accurate correction of polarization-sensitive array errors. Virtual aperture expansion angle measurement, based on the corrected data, utilizes higher-order cumulants to expand the effective aperture, breaking through the limitations of the physical aperture, thereby improving the angle measurement accuracy and resolution of the array radar. This invention can be applied to polarization-sensitive arrays of arbitrary structures, correcting all array errors present in actual engineering, and is suitable for harsh conditions with multiple errors, enabling direct application in engineering.

The invention provides a chaotic optoelectronic oscillator time delay characteristic suppression method based on the synergistic effect of a dispersion effect and a wide-spectrum light source. The laser source generates high-stability continuous optical signals, and the polarization state of the continuous optical signals is adjusted through the polarization controller so as to be matched with a polarization sensitive axis of the Mach-Zehnder modulator. The MZM serves as a nonlinear core device, and intensity modulation is carried out on feedback electric signals through a nonlinear transmission function of the MZM. An optical signal output by the MZM is divided into two paths through a first optical coupler, wherein one path enters a monitoring system and is output as a chaotic signal; and the other path enters a photoelectric feedback loop. In a feedback loop, an optical signal firstly enters an erbium-doped optical fiber amplifier for power compensation so as to offset insertion loss caused by subsequent long-distance optical fibers; and then entering a dispersion link formed by cascading a dispersion compensation optical fiber and a standard single-mode optical fiber. According to the invention, by introducing the dispersion link and utilizing the time delay characteristic related to the frequency, the suppression level is improved by about 22.6 dB, and the confidentiality and randomness of the system are greatly enhanced. The structure is simple and standardized.

The application belongs to the field of semiconductor optoelectronic devices, and discloses a polarization-sensitive neuromorphic vision sensor and a preparation method thereof.The polarization-sensitive neuromorphic vision sensor comprises, from bottom to top, a control gate, a bottom gate dielectric, a floating gate layer, a tunneling layer dielectric and a semiconductor channel layer, and a source electrode and a drain electrode are further arranged on the semiconductor channel layer, wherein the semiconductor channel layer is an in-plane anisotropic semiconductor channel layer.By using the in-plane anisotropic semiconductor channel layer as the semiconductor channel layer, the device as a whole can realize polarization light sensing function and achieve polarization-sensitive characteristics.The device can selectively perceive and process visual information, avoiding the calculation load and interference caused by the unnecessary information processing process of the redundant data flowing into the rear end on the image recognition task.

A geometric phase in-line scanning holography system for a transmissive object, includes: a polarization sensitive lens, which receives a linear polarization beam to generate a first spherical wave of right-sided circularly polarized light and a second spherical wave of left-sided circularly polarized light; a scan means for scanning the transmissive object by using an interference beam generated between the generated first and second spherical waves; a first beam splitter, which receives a beam having been transmitted through the transmissive object, so as to split the received beam into first and second output beams; first and second polarizers for polarizing the first and second output beams, respectively; and first and second photodetectors for detecting output beams having passed through the first and second polarizers.

The invention provides a dual-polarization low-pass frequency selective surface array structure with a stable wide angle. The dual-polarization low-pass frequency selective surface array structure mainly solves the problems that an existing ultra-wideband frequency selective surface is limited in passband bandwidth, sensitive in polarization and unstable in angle. The wide-angle-stable dual-polarization low-pass frequency selective surface array structure unit comprises a first dielectric substrate and conductors printed on the two sides of the dielectric substrate, wherein the conductor structures of the A surface and the B surface are formed by arranging rectangular double-opening ring units in ten layers in the longitudinal direction; and the rectangular double-opening ring units on each layer are different in longitudinal length. And aiming at dual-polarization incidence, the structure units are rotated by 90 degrees along the longitudinal direction to obtain a second dielectric substrate and a conductor structure. The ultra-wide low-frequency transmission performance and the edge steep drop characteristic are achieved, and the stable filtering effect on TE / TM electromagnetic waves incident within the angle of 70 degrees is achieved.

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.

The invention belongs to the technical field of polarization sensitive array parameter estimation, and particularly relates to a low-complexity real-time polarization sensitive array parameter estimation method by using an external reference source, which comprises the following steps of: virtualizing a single full-component electromagnetic vector sensor as an array through a time interval, and receiving electric field three-component and magnetic field three-component signals by the sensor; selecting a narrowband complete polarization signal source, setting carrier frequency, sampling frequency, number of snapshots and real parameters of the signal source, and setting Monte Carlo simulation times and a signal-to-noise ratio; overlapping signals containing channel amplitude-phase errors and prior standard source signals are received through simulation modeling, parameters of the overlapping signals are unknown, only signal data are known, and parameters and signal models of the prior standard source signals are known; and calculating a guiding matrix by using the priori standard source signal parameter to obtain a priori standard source signal without error and noise.

The application discloses a high-precision linear polarization information measuring device, and relates to the technical field of semiconductor linear polarization light information measurement. The device comprises a detection unit module, a voltage processing module and a calculation and output module. Two groups of four detectors are connected in series through a circuit, and the maximum polarization sensitive directions of the two groups of detectors are 45 degrees apart. When linear polarization light irradiation occurs under a certain power supply bias, the detection unit module generates two voltage signals, and the generated voltage signals are only related to a polarization angle. The two voltage signals pass through the voltage processing module, and a voltage signal filtered from common mode interference is obtained through a programmed gain voltage amplifier and a difference processing circuit. Finally, the processed voltage signal is transmitted to the calculation and output module. A calculation unit in the module processes and transmits the processed voltage signal to a display device through communication, so that visual linear polarization information is obtained.

The invention discloses a vertical-structure polarization sensitive diode device based on a styryl organic single crystal, and a preparation method and application of the vertical-structure polarization sensitive diode device. The vertical structure polarization sensitive diode device based on the styryl organic single crystal comprises a top electrode, a hole injection layer, a hole transport layer, the styryl organic single crystal, an electron transport layer, an electron injection layer, a bottom electrode and a glass substrate which are sequentially arranged from top to bottom, the top electrode is a silver electrode; the hole injection layer comprises molybdenum trioxide; the hole transport layer comprises N, N '-diphenyl-N, N'-(1-naphthyl)-1, 1 '-biphenyl-4, 4'-diamine; the styryl organic single crystal is a 1, 4-bis-(2-methyl-styryl) benzene single crystal; the electron transport layer comprises 3, 3 '-[5'-[3-(3-pyridyl) phenyl] [1, 1 ': 3', 1 ''-terphenyl]-3, 3''-diyl] bipyridine; the electron injection layer comprises lithium fluoride; the bottom electrode is an aluminum electrode. According to the invention, the vertical-structure polarization sensitive diode device based on the styryl organic single crystal, which simultaneously has light response and luminescence properties, is obtained through simple regulation and control.

According to the three-wavelength and four-angle polarization sensitive holographic imaging system provided by the invention, the imaging system has wavelength and polarization resolution capability by using a mode of increasing information channels and synchronously acquiring; distortion phase and scattering noise, caused by medium refractive index disturbance and smoke multiple scattering in a severe imaging environment, of a target light field are analyzed, and the complex and severe environment imaging problem similar to an energetic particle combustion field can be well solved. Furthermore, four-angle polarization is introduced to increase an independent channel, so that the anti-interference capability of holographic imaging is improved, and the information storage capacity of the system is improved by four times on the premise that the physical size does not need to be increased. The problem of extinction and speckle interference caused by high particle concentration number is solved by means of the thought of synchronous interpretation of multi-dimensional light field information, and polarization characteristic parameters capable of distinguishing particles from background areas are extracted from polarization channels by means of the advantage of more stable transmission of polarization characteristics of light so as to obtain three-dimensional position information of the particles.

The invention relates to a robust adaptive beam forming method based on a polarization sensitive array. The method comprises the following steps: estimating a covariance matrix of interference and noise signals; obtaining the uncertain range of the airspace arrival angle of the expected signal, and calculating an accumulation matrix C according to the range and the airspace guide vector of the array, and representing the accumulation matrix C as follows: a pitch angle and an azimuth angle; performing eigendecomposition on the accumulation matrix C, and determining an eigenvector matrix corresponding to a main eigenvalue of the accumulation matrix C; calculating an optimal rotation vector based on the feature vector matrix and the interference and noise covariance matrix; calculating an optimal weight vector of beam forming based on the feature vector matrix and the optimal rotation vector; and performing beam forming on received data of the polarization sensitive array based on the optimal weight vector. According to the invention, the beam forming carried out when the angle of arrival is mismatched shows good robustness.

The invention provides an active frequency selective surface with polarization independence and angle stability, which comprises a dielectric substrate and cross-shaped metal rings arranged on the dielectric substrate periodically, the tail end of each arm of each cross-shaped metal ring is provided with a notch, each notch is bridged with a PIN diode, and the PIN diode is connected with the dielectric substrate. The cross-shaped metal ring and the four PIN diodes symmetrically arranged on the cross-shaped metal ring jointly form a 90-degree rotational symmetric structure, so that the active frequency selective surface has highly consistent frequency response characteristics for incident electromagnetic waves in different polarization directions; by synchronously controlling the on-off states of all PIN diodes, the resonant frequency of the active frequency selective surface is switched between two frequencies in a Ku wave band, the problem of polarization sensitivity caused by anisotropy of a traditional adjustable structure is fundamentally solved, and excellent polarization independence is achieved.

The invention discloses a polarization spectrum information acquisition method based on an acousto-optic tunable filter, and belongs to the technical field of optical polarization and spectral imaging. According to the method, a detection light path comprising a diaphragm, a phase delayer, a front lens group, an acousto-optic tunable filter, a rear lens group, a reflector, a polarization analyzer, an imaging lens group and a detector is constructed, incident light is subjected to polarization beam splitting by using the polarization sensitive characteristic of the acousto-optic tunable filter, and the diffraction spectrum is detected under the condition that the diffraction spectrum is not influenced. Transmission light is led out through a reflecting mirror, and spectrum and polarization information is obtained through the transmission o light and the transmission e light; acquiring light intensity information of a target in different spectrum channels by combining the light intensity difference of transmitted light of the acousto-optic tunable filter in the power-off state and the power-on state; a polarization information resolving model is established based on a polarization transformation matrix theory, flexible resolving of target polarization information is realized through combined modulation of a phase delayer and a polarization analyzer, and the method is suitable for detection in various scenes.

A device for scanning range measurement to an object has a light source that generates an optical output signal having a varying frequency. A plurality of optical processing units are connected optically in parallel to the light source. Each processing unit has an optical distribution matrix with a plurality of optical switches that distribute the optical output signals from the light source selectively to different optical waveguides. A plurality of free space couplers outcouple the optical output signals into the free space, and couple optical output signals, which were reflected on the object, into the associated optical waveguides as optical measurement signals. A polarization sensitive light splitter directs the optical measurement signals detectors that detect a superposition of the optical measurement signals with the optical output signals supplied via a local oscillator light path.

The invention belongs to the field of electromagnetic wave-absorbing frequency selective surface design, and particularly relates to a frequency selective surface design method for realizing performance superposition through patch combination, which comprises the following steps: establishing a corresponding FSS basic unit model by using simulation software according to design requirements; the method comprises the following steps of: acquiring a wave-absorbing performance index, establishing a wave-absorbing performance database corresponding to different FSS basic units, performing parameter sweep frequency analysis, decomposing the performance index into a regional performance index according to a wave-absorbing performance requirement, and screening FSS patches meeting the regional performance index from the wave-absorbing performance database; combining the screened FSS patches to obtain a frequency selective surface scheme meeting performance requirements; the designed FSS scheme is prepared by using a surface processing means, the data volume in a database is accumulated and increased in the use process, more samples for screening are provided for subsequent design, the optimal solution under the performance target can be obtained under any condition, the combination mode in the combination process is optimized, and the design efficiency is improved. And the problem of polarization sensitivity is avoided.

The invention relates to a direction of arrival and polarization parameter estimation method based on a mobile nested polarization array, and the method comprises the steps: constructing a sparse nested polarization sensitive array to determine a position set of all sensors, obtaining an original array, and obtaining the receiving data of the original array; performing uniform / non-uniform movement on the original array for multiple times to obtain a position set of a mobile array formed after each time of movement and corresponding receiving data; combining the original array with each mobile array to obtain a synthetic array; receiving data according to the synthetic array to calculate a covariance matrix, dividing the covariance matrix into a plurality of sub-covariance matrixes, vectorizing each sub-covariance matrix, obtaining virtual sub-covariance matrixes by adopting a spatial smoothing technology, and combining the sub-covariance matrixes to form an overall virtual covariance matrix; and estimating the direction of arrival and polarization parameters according to the structural characteristics of the overall virtual covariance matrix in combination with a module value constraint strategy. Compared with the prior art, the method has the advantages of low calculation complexity, high estimation precision and the like.