In clinical environments,the prolonged utilization of polarization equipment can result in theaccumulation of errors over extended periods.The absence of expeditious calibration techniques in clinical practice present...In clinical environments,the prolonged utilization of polarization equipment can result in theaccumulation of errors over extended periods.The absence of expeditious calibration techniques in clinical practice presents a significant obstacle in preserving the precision and dependability of these instruments.To address this challenge,we propose an innovative research study that presents a comprebersive calibration system specifically designed for the calibration of the backscattering Muellet matrix measurement system,enabling swift online calibration acroes various scenarios.This system employs an external calibration framework for rmal-time adjust-ment of the polarizer's initial angle,oversecing the rotation of PSG and PSA motors through position measurement and control procedures,with light intensity monitored by a camera.By incorporating moment um concepts and the Adam optimization algorithm,we enhance conver-gence speed,mitigate noise,and improve calibration accuracy.Experimental results showcase the exceptional precision,speed,and robustness of oрroposed method,achieving high acсuracy and minimal error,thereby offering a promising solution for maintaining the reliabilit y of polarization equipment in clinical settings.展开更多
Accurately and swiftly characterizing the state of polarization(SoP)of complex structured light is crucial in the realms of classical and quantum optics.Conventional strategies for detecting SoP,which typically involv...Accurately and swiftly characterizing the state of polarization(SoP)of complex structured light is crucial in the realms of classical and quantum optics.Conventional strategies for detecting SoP,which typically involves a sequence of cascaded optical elements,are bulky,complex,and run counter to miniaturization and integration.While metasurfaceenabled polarimetry has emerged to overcome these limitations,its functionality predominantly remains confined to identifying SoP within the standard Poincare sphere framework.The comprehensive detection of SoP on the higherorder Poincare sphere(HOPS),however,continues to be a huge challenge.Here,we propose a general polarization metrology method capable of fully detecting SoP on any HOPS through a single measurement.The underlying mechanism relies on transforming the optical singularities and Stokes parameters into visualized intensity patterns,facilitating the extraction of all parameters that fully determine a SoP.We actualize this concept through a novel metadevice known as the metasurface photonics polarization clock,which offers an intuitive display of SoP using four distinct pointers.As a proof of concept,we theoretically and experimentally demonstrate fully resolving SoPs on the Oth,1st,and 2nd HOPSs.Our implementation opens up a new pathway towards real-time polarimetry of arbitrary beams featuring miniaturized size,a simple detection process,and a direct readout mechanism,promising significant advancements in fields reliant on polarization.展开更多
Hot carriers generated at the vicinity of the metal electrode in a WSe2 photodetector are extracted and amplified by a MoS2 field effect transistor,leading to a strong polarization-dependent photocurrent.This miniatur...Hot carriers generated at the vicinity of the metal electrode in a WSe2 photodetector are extracted and amplified by a MoS2 field effect transistor,leading to a strong polarization-dependent photocurrent.This miniaturized polarization detection system assembled from two-dimensional materials enables new possibilities in optical communication and image recognition.展开更多
2D Ruddlesden-Popper(RP)polar perovskite,displaying the intrinsic optical anisotropy and structural polarity,has a fantastic application perspective in self-powered polarized light detection.However,the weak van der W...2D Ruddlesden-Popper(RP)polar perovskite,displaying the intrinsic optical anisotropy and structural polarity,has a fantastic application perspective in self-powered polarized light detection.However,the weak van der Waals interaction between the organic spacing bilayers is insufficient to preserve the stability of RP-type materials.Hence,it is of great significance to explore new stable 2D RP-phase candidates.In this work,we have successfully constructed a highly-stable polar 2D perovskite,(t-ACH)_(2)PbI_(4)(1,where t-ACH^(+)is HOOC_(8)H_(12)NH_(3)^(+)),by adopting a hydrophobic carboxylate trans-isomer of tranexamic acid as the spacing component.Strikingly,strong O-H…O hydrogen bonds between t-ACH^(+)organic bilayers compose the dimer,thus decreasing van der Waals gap and enhancing structural stability.Besides,such orientational hydrogen bonds contribute to the formation of structural polarity and generate an obvious bulk photovoltaic effect in 1,which facilitates its self-powered photodetection.As predicted,the combination of inherent anisotropy and polarity leads to self-powered polarized-light detection with a high ratio of around∼5.3,superior to those of inorganic 2D counterparts.This work paves a potential way to design highly-stable 2D perovskites for high-performance optoelectronic devices.展开更多
We propose a high-sensitivity spin polarization detection scheme based on optical amplitude modulation in atomic co-magnetometers,which is different from the traditional configuration.A linearly polarized laser with i...We propose a high-sensitivity spin polarization detection scheme based on optical amplitude modulation in atomic co-magnetometers,which is different from the traditional configuration.A linearly polarized laser with intensity modulation interacts with electron spins,generating optical rotation angles.Through differential amplification and demodulation,atomic spin polarization information is extracted with high precision.The effectiveness of the proposed method is verified by applying external perturbations during testing.Compared to traditional detection methods,the proposed approach effectively enhances inertial measurement sensitivity.Specifically,at 1 Hz,the measurement sensitivity has improved from9.7×10^(-6)to 3.25×10^(-6)deg/(s Hz^(1/2)).Furthermore,the proposed scheme is easily integrable and conducive to future research on miniaturizing co-magnetometers and can also be applied to many other related fields.展开更多
Palladium diselenide(PdSe_(2)),a novel two-dimensional(2D)material with a unique pentagonal crystal structure including anisotropic properties,has emerged as a highly promising candidate for developing the next genera...Palladium diselenide(PdSe_(2)),a novel two-dimensional(2D)material with a unique pentagonal crystal structure including anisotropic properties,has emerged as a highly promising candidate for developing the next generation photoelectronic devices.In this review,firstly,we have shed light on key figures of merit for polarization detection.After that,this review mainly highlights the structural and electronic properties of PdSe_(2)focusing on its strong polarization sensitivity,tunable bandgap,and excellent environmental stability,making it ideal for developing the photoelectronic devices such as broadband photodetectors and their further applications in polarization detection-based imaging systems.We also discuss challenges in scalable synthesis,material stability,and integration with other low-dimensional materials,offering future research directions to optimize PdSe_(2)for commercial applications.Owing to the outstanding optoelectronic properties of PdSe_(2),it stands at the forefront of optoelectronic materials,poised to enable new innovations in polarization photodetection.展开更多
The polarization properties of light are widely applied in imaging,communications,materials analy⁃sis,and life sciences.Various methods have been developed that can measure the polarization information of a target.How...The polarization properties of light are widely applied in imaging,communications,materials analy⁃sis,and life sciences.Various methods have been developed that can measure the polarization information of a target.However,conventional polarization detection systems are often bulky and complex,limiting their poten⁃tial for broader applications.To address the challenges of miniaturization,integrated polarization detectors have been extensively explored in recent years,achieving significant advancements in performance and functionality.In this review,we focus mainly on integrated polarization detectors with innovative features,including infinitely high polarization discrimination,ultrahigh sensitivity to polarization state change,full Stokes parameters measure⁃ment,and simultaneous perception of polarization and other key properties of light.Lastly,we discuss the oppor⁃tunities and challenges for the future development of integrated polarization photodetectors.展开更多
The SAR（Synthetic Aperture Radar） has the capabilities for all-weather day and night use. In the case of determining the effects of oil spill dumping, the oil spills areas are shown as dark spots in the SAR images.T...The SAR（Synthetic Aperture Radar） has the capabilities for all-weather day and night use. In the case of determining the effects of oil spill dumping, the oil spills areas are shown as dark spots in the SAR images.Therefore, using SAR data to detect oil spills is becoming progressively popular in operational monitoring, which is useful for oceanic environmental protection and hazard reduction. Research has been conducted on the polarization decomposition and scattering characteristics of oil spills from a scattering matrix using allpolarization of the SAR data, calculation of the polarization parameters, and utilization of the CPD（Co-polarized Phase Difference） of the oil and the sea, in order to extract the oil spill information. This method proves to be effective by combining polarization parameters with the characteristics of oil spill. The results show that when using Bragg, the oil spill backscattering machine with Enopy and a mean scatter α parameter. The oil spill can be successfully identified. However, the parameter mechanism of the oil spill remains unclear. The use of CPD can easily extract oil spill information from the ocean, and the polarization research provides a base for oil spill remote sensing detection.展开更多
Imaging detection is an important means to obtain target information.The traditional imaging detection technology mainly collects the intensity information and spectral information of the target to realize the classif...Imaging detection is an important means to obtain target information.The traditional imaging detection technology mainly collects the intensity information and spectral information of the target to realize the classification of the target.In practical applications,due to the mixed scenario,it is difficult to meet the needs of target recognition.Compared with intensity detection,the method of polarization detection can effectively enhance the accuracy of ground object target recognition(such as the camouflage target).In this paper,the reflection mechanism of the target surface is studied from the microscopic point of view,and the polarization characteristic model is established to express the relationship between the polarization state of the reflected signal and the target surface parameters.The polarization characteristic test experiment is carried out,and the target surface parameters are retrieved using the experimental data.The results show that the degree of polarization(DOP)is closely related to the detection zenith angle and azimuth angle.The(DOP)of the target is the smallest in the direction of light source incidence and the largest in the direction of specular reflection.Different materials have different polarization characteristics.By comparing their DOP,target classification can be achieved.展开更多
A fluorescence polarization immunoassay （FPIA） was developed for the analysis ofaflatoxins （AFs） using an anti-aflatoxin B1 （AFB1） monoclonal antibody and a novel fluorescein-labeled AFB1 tracer. The FPIA showed...A fluorescence polarization immunoassay （FPIA） was developed for the analysis ofaflatoxins （AFs） using an anti-aflatoxin B1 （AFB1） monoclonal antibody and a novel fluorescein-labeled AFB1 tracer. The FPIA showed an IC50 value of 23.33 ng/mL with a limit of detection of 13.12 ng/mL for AFB1. The cross-reactivities of AFB1, AFB2, AFG1, AFG2, AFM1, and AFM2 with the antibody were 100%, 65.7%, 143%, 23.5%, 111.4%, and 2%, respectively. The group-specificity of anti-AFB1mAb indicated that the FPIA could potentially be used in a screening method for the detection of total AFs, albeit not AFG2 and AFM2. The total time required for analyzing 96 samples in one microplate was less than 5 rain. This study demonstrates the potential usefulness of the FPIA as a rapid and simple technique for monitoring AFs.展开更多
Polarized-sensitive image sensors are a kind of photodetector with great development potential due to their enhanced ability to detect and identify the target objects from the aspect of spatial,spectral and polarized ...Polarized-sensitive image sensors are a kind of photodetector with great development potential due to their enhanced ability to detect and identify the target objects from the aspect of spatial,spectral and polarized information.Recently,low-dimensional anisotropic materials with inherent anisotropic properties,ultrathin thickness,tunable bandgap and feasible integration with complementary metal oxide semiconductor(CMOS)fabrication processes have attracted great interest for their facilitation of polarized photodetector devices miniaturization.Maximizing the polarized detection performance of low-dimensional materials to satisfy realistic needs stimulates the exploration of modulation of anisotropic properties.In this review,we comprehensively introduce the latest research progress in modulating the optical and optoelectronic anisotropy characteristics of low-dimensional materials.The strategy of anisotropy regulation through crystal structure engineering and coupling system is discussed emphatically.Then,the latest progress in image recognition applications using anisotropic low-dimensional materials is reviewed in detail.Finally,we summarize the challenge and propose future opportunities in the practical application of polarized-sensitive imaging photodetectors based on low-dimensional anisotropic materials.展开更多
Electrolysis tanks are used to smeltmetals based on electrochemical principles,and the short-circuiting of the pole plates in the tanks in the production process will lead to high temperatures,thus affecting normal pr...Electrolysis tanks are used to smeltmetals based on electrochemical principles,and the short-circuiting of the pole plates in the tanks in the production process will lead to high temperatures,thus affecting normal production.Aiming at the problems of time-consuming and poor accuracy of existing infrared methods for high-temperature detection of dense pole plates in electrolysis tanks,an infrared dense pole plate anomalous target detection network YOLOv5-RMF based on You Only Look Once version 5(YOLOv5)is proposed.Firstly,we modified the Real-Time Enhanced Super-Resolution Generative Adversarial Network(Real-ESRGAN)by changing the U-shaped network(U-Net)to Attention U-Net,to preprocess the images;secondly,we propose a new Focus module that introduces the Marr operator,which can provide more boundary information for the network;again,because Complete Intersection over Union(CIOU)cannot accommodate target borders that are increasing and decreasing,replace CIOU with Extended Intersection over Union(EIOU),while the loss function is changed to Focal and Efficient IOU(Focal-EIOU)due to the different difficulty of sample detection.On the homemade dataset,the precision of our method is 94%,the recall is 70.8%,and the map@.5 is 83.6%,which is an improvement of 1.3%in precision,9.7%in recall,and 7%in map@.5 over the original network.The algorithm can meet the needs of electrolysis tank pole plate abnormal temperature detection,which can lay a technical foundation for improving production efficiency and reducing production waste.展开更多
Polarization is an important attribute of light and can be artificially modulated as a versatile information carrier.Conventional polarization-sensitive photodetection relies on a combination of polarizing optical ele...Polarization is an important attribute of light and can be artificially modulated as a versatile information carrier.Conventional polarization-sensitive photodetection relies on a combination of polarizing optical elements and standard photodetectors,which requires a substantial amount of space and manufacturing expenses.Although onchip polarized photodetectors have been realized in recent years based on two-dimensional(2D)materials with lowsymmetry crystal structures,they are limited by the intrinsic anisotropic property and thus the optional range of materials,the operation wavelength,and more importantly,the low anisotropic ratio,hindering their practical applications.In this work,we construct a versatile platform that transcends the constraints of material anisotropy,by integrating WSe2-based photodetector with MoS2-based field-effect transistor,delivering high-performance broadband polarization detection capability with orders of magnitude improvement in anisotropic ratio and on/off ratio.The polarization arises from hot electron injection caused by the plasmonic metal electrode and is amplified by the transistor to raise the anisotropic ratio from 2 to an impressive value over 60 in the infrared(iR)band,reaching the level of existing applications.Meanwhile,the system achieves a significant improvement in photosensitivity,with an on/off ratio of over 1o3 in the IR band.Based on the above performance optimization,we demonstrated its polarization-modulated IR optical communication ability and polarized artificial vision applications with a high image recognition accuracy of~99%.The proposed platform provides a promising route for the development of the longsought minimized,high-performance,multifunctional optoelectronic systems.展开更多
Polarization detection is essential for various applications,ranging from biological diagnostics to quantum optics.Although various metasurface-based polarimeters have emerged,these platforms are commonly realized thr...Polarization detection is essential for various applications,ranging from biological diagnostics to quantum optics.Although various metasurface-based polarimeters have emerged,these platforms are commonly realized through spatial-division designs,which restrict detection accuracy due to inherent factors such as crosstalk.Here,we propose,to our knowledge,a novel strategy for high-accuracy,broadband full-Stokes polarization detection based on the analysis of a single vector beam,whose polarization profile varies sensitively and exhibits a one-to-one correspondence with the incident polarization.Based on this,the incident polarization is completely encoded into the field profile of the vector beam,which avoids crosstalk in principle,and results in high-accuracy polarization detection without any calibration process.As a proof of concept,a geometric-phase metasurface-based grafted perfect vector vortex beam(GPVVB)generator was designed and fabricated.Experimental results demonstrate that our method achieves polarization detection with an average relative error of 2.25%.Benefiting from the broadband high transmittance exceeding 95%of the metasurface due to the femtosecond laser-induced birefringence process,our method operates across a wavelength range of 450–1100 nm.Furthermore,the detection capability of the vector beam polarization profile was validated using a GPVVB-generating array.These results highlight the potential of our approach for transformative applications in polarization detection,including optical communication and machine vision.展开更多
Theoretical analysis and experimental research on the polarization properties of output light in gyro are carried out to investigate the phenomenon that the amplitude of an output voltage signal is modulated by dither...Theoretical analysis and experimental research on the polarization properties of output light in gyro are carried out to investigate the phenomenon that the amplitude of an output voltage signal is modulated by dither bias in laser gyros consisting of totally reflecting prisms. Taking the effect of prism stress birefringence into account, an analytical formula of the output light intensity in the gyro and the relationship between the polarization parameter and the amplitude modulation of the output signal are obtained and discussed. For the first time, the polarized power value of the output light is adopted as a basis to estimate the output signal amplitude fading extent of laser gyros. Experimental results demonstrate that when the value of polarized power of output light is below 25.5% of that in ideal static case, the standard error is over 0.0337 dBm, and the displacement extent of the prism is higher than 53% of the radius of the beam waist in the gyro cavity, the amplitude modulation extent of gyro output signal can reach up to 16%, which badly influences the measurement accuracy of the laser gyro. Using this polarized power detecting measurement method can repair the gyro immediately during its fabrication process, improve the testing and production efficiency and shorten the product development cycle.展开更多
A novel software implementation for current polarity detection and current compensation is presented. For a three-phase zero-voltage soft-switching （ZVS） PWM converter based on phase and amplitude control （PAC）, w...A novel software implementation for current polarity detection and current compensation is presented. For a three-phase zero-voltage soft-switching （ZVS） PWM converter based on phase and amplitude control （PAC）, when saw-tooth carriers with alternate positive and negative slopes are adopted, the positive or negative slopes are chosen according to the phase current polarity. Since polarity reversal causes current distortion, current at the instant of reversal should be compensated for. Based on the characteristic of unity power factor converter in rectification and regeneration modes, a software implementation for current polarity detection is proposed. Distortion of current zero-crossing caused by using saw-tooth carriers with alternate positive and negative slopes is analyzed, and the relevant compensation method is proposed. Experimental study with a 1.5 kW device shows that phase current has a small harmonic content and power factor is high both in rectification and regeneration modes.展开更多
Circular polarizers based on the metasurface suffer from a trade-off between the structural complexity and thepolarization extinction ratio (ER). Herein, we present a single-layer chiral metasurface with strong circul...Circular polarizers based on the metasurface suffer from a trade-off between the structural complexity and thepolarization extinction ratio (ER). Herein, we present a single-layer chiral metasurface with strong circular dichroism. Thestructure turns a circularly polarized incident beam into a linearly polarized beam, achieving a high circular polarization ER. Theoperating wavelength of the proposed metasurface is tunable by changing the geometric parameters. The metasurface's localizedsurface plasmon resonances between structures ensure strong chiral optical effects. We further experimentally demonstrate thecircular dichroism of the fabricated metasurface.展开更多
High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous motor.However,traditional methods require a large number of filters,which ...High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous motor.However,traditional methods require a large number of filters,which leads to the deterioration of system stability and dynamic performance.In order to solve these problems,a new signal demodulation method is proposed in this paper.The proposed new method can directly obtain the amplitude of high-frequency current,thus eliminating the use of filters,improving system stability and dynamic performance and saving the work of adjusting filter parameters.In addition,a new magnetic polarity detection method is proposed,which is robust to current measurement noise.Finally,experiments verify the effectiveness of the method.展开更多
Chiral organic-inorganic hybrid halides show significant potential for applications in circularly polarized photodetection,chiral-induced spin selectivity effects(CISS),and nonlinear optics.However,the widespread use ...Chiral organic-inorganic hybrid halides show significant potential for applications in circularly polarized photodetection,chiral-induced spin selectivity effects(CISS),and nonlinear optics.However,the widespread use of toxic lead element poses environmental concerns,hindering the further applications.Herein,we synthesized a zero-dimensional(0D)lead-free chiral antimony-based halide(R/S-MBA)_(4)Sb_(2)Br_(10)with the coexistence of polarity and crystallographic chirality.The halides exhibit unique magneto-chiroptical effects due to the field-effect-induced fine-tuning of exciton energy,which is the first observation in chiral antimony-based halides.Furthermore,owing to its significant spontaneous polarization(5.0μC/cm^(2))and optical chirality(g_(CD)=0.0018),(R/S-MBA)_(4)Sb_(2)Br_(10)halide exhibits excellent performance in self-powered circularly polarized photodetection,nonlinear optics,and CISS effects.The self-powered photodetector demonstrates high sensitivity with distinguishable factors(g_(res)=0.53/-0.51@0 V)and broad spectral response.The single crystal(R/S-MBA)_(4)Sb_(2)Br_(10)also exhibits a high second-harmonic polarization response asymmetry factor(g_(SHG-CD)=0.98/-0.70)and strong second-harmonic generation intensity.These performances are among the best reported for chiral halides.Our research not only sheds new light on the investigation of magneto-chiroptical phenomena,but also marks a significant advancement in realizing high-sensitivity circularly polarized light detection within the realm of lead-free polar materials.展开更多
Polarization-based detection technologies have broad applications across various fields.Integrating polarization with interferometric imaging holds significant promise for simultaneously capturing three-dimensional st...Polarization-based detection technologies have broad applications across various fields.Integrating polarization with interferometric imaging holds significant promise for simultaneously capturing three-dimensional structure and polarization information.However,existing interferometric polarization measurement methods often rely on complex setups and sacrifice the acquisition rate or axial imaging range for parameter diversity.展开更多
基金the Knowledge Innovation Program of Basic Re-search Projects of Shenzhen for their support under Grant No.JCYJ20200109142805928the funding provided by the Basic and Applied Basic Research Foundation of Guangdong Provinæunder Grant No.2021A1515220113partially supported by the Guangzhou Municipal Science and Technology Project under Grant 202102010421.
文摘In clinical environments,the prolonged utilization of polarization equipment can result in theaccumulation of errors over extended periods.The absence of expeditious calibration techniques in clinical practice presents a significant obstacle in preserving the precision and dependability of these instruments.To address this challenge,we propose an innovative research study that presents a comprebersive calibration system specifically designed for the calibration of the backscattering Muellet matrix measurement system,enabling swift online calibration acroes various scenarios.This system employs an external calibration framework for rmal-time adjust-ment of the polarizer's initial angle,oversecing the rotation of PSG and PSA motors through position measurement and control procedures,with light intensity monitored by a camera.By incorporating moment um concepts and the Adam optimization algorithm,we enhance conver-gence speed,mitigate noise,and improve calibration accuracy.Experimental results showcase the exceptional precision,speed,and robustness of oрroposed method,achieving high acсuracy and minimal error,thereby offering a promising solution for maintaining the reliabilit y of polarization equipment in clinical settings.
基金support from the National Natural Science Foundation of China(Grant No.62275078,12204165,52221001,62205250,12421005,62475069)Natural Science Foundation of Hunan Province(Grant No.2022JJ20020,2023JJ40112)+2 种基金the Science and Technology Innovation Program of Hunan Province(Grant No.2023RC3101)the Hunan Major Sci-Tech Program(Grant No.2023ZJ1010)Shenzhen Science and Technology Program(GrantNo.JCYJ20220530160405013).
文摘Accurately and swiftly characterizing the state of polarization(SoP)of complex structured light is crucial in the realms of classical and quantum optics.Conventional strategies for detecting SoP,which typically involves a sequence of cascaded optical elements,are bulky,complex,and run counter to miniaturization and integration.While metasurfaceenabled polarimetry has emerged to overcome these limitations,its functionality predominantly remains confined to identifying SoP within the standard Poincare sphere framework.The comprehensive detection of SoP on the higherorder Poincare sphere(HOPS),however,continues to be a huge challenge.Here,we propose a general polarization metrology method capable of fully detecting SoP on any HOPS through a single measurement.The underlying mechanism relies on transforming the optical singularities and Stokes parameters into visualized intensity patterns,facilitating the extraction of all parameters that fully determine a SoP.We actualize this concept through a novel metadevice known as the metasurface photonics polarization clock,which offers an intuitive display of SoP using four distinct pointers.As a proof of concept,we theoretically and experimentally demonstrate fully resolving SoPs on the Oth,1st,and 2nd HOPSs.Our implementation opens up a new pathway towards real-time polarimetry of arbitrary beams featuring miniaturized size,a simple detection process,and a direct readout mechanism,promising significant advancements in fields reliant on polarization.
文摘Hot carriers generated at the vicinity of the metal electrode in a WSe2 photodetector are extracted and amplified by a MoS2 field effect transistor,leading to a strong polarization-dependent photocurrent.This miniaturized polarization detection system assembled from two-dimensional materials enables new possibilities in optical communication and image recognition.
基金supported by the National Natural Science Foundation of China(NSFC,Nos.22125110,U23A2094,22205233,22193042,21921001,22305248 and U21A2069)the Natural Science Foundation of Fujian Province(No.2023J02028)+3 种基金the Key Research Program of Frontier Sciences of Chinese Academy of Sciences(No.ZDBS-LY-SLH024)Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(No.2021ZR126)the National Key Research and Development Program of China(No.2019YFA0210402)the China Postdoctoral Science Foundation(Nos.2022TQ0337 and 2023M733497).
文摘2D Ruddlesden-Popper(RP)polar perovskite,displaying the intrinsic optical anisotropy and structural polarity,has a fantastic application perspective in self-powered polarized light detection.However,the weak van der Waals interaction between the organic spacing bilayers is insufficient to preserve the stability of RP-type materials.Hence,it is of great significance to explore new stable 2D RP-phase candidates.In this work,we have successfully constructed a highly-stable polar 2D perovskite,(t-ACH)_(2)PbI_(4)(1,where t-ACH^(+)is HOOC_(8)H_(12)NH_(3)^(+)),by adopting a hydrophobic carboxylate trans-isomer of tranexamic acid as the spacing component.Strikingly,strong O-H…O hydrogen bonds between t-ACH^(+)organic bilayers compose the dimer,thus decreasing van der Waals gap and enhancing structural stability.Besides,such orientational hydrogen bonds contribute to the formation of structural polarity and generate an obvious bulk photovoltaic effect in 1,which facilitates its self-powered photodetection.As predicted,the combination of inherent anisotropy and polarity leads to self-powered polarized-light detection with a high ratio of around∼5.3,superior to those of inorganic 2D counterparts.This work paves a potential way to design highly-stable 2D perovskites for high-performance optoelectronic devices.
基金supported by the National Natural Science Foundation of China(No.62103026)the Innovation Program for Quantum Science and Technology(Nos.2021ZD0300400 and 2021ZD0300402)the China National Funds for Distinguished Young Scientists(No.61925301)。
文摘We propose a high-sensitivity spin polarization detection scheme based on optical amplitude modulation in atomic co-magnetometers,which is different from the traditional configuration.A linearly polarized laser with intensity modulation interacts with electron spins,generating optical rotation angles.Through differential amplification and demodulation,atomic spin polarization information is extracted with high precision.The effectiveness of the proposed method is verified by applying external perturbations during testing.Compared to traditional detection methods,the proposed approach effectively enhances inertial measurement sensitivity.Specifically,at 1 Hz,the measurement sensitivity has improved from9.7×10^(-6)to 3.25×10^(-6)deg/(s Hz^(1/2)).Furthermore,the proposed scheme is easily integrable and conducive to future research on miniaturizing co-magnetometers and can also be applied to many other related fields.
基金supported by the National Key Research and Development Program of China under Grant No.2019YFB 2203400the“111 project”under Grant No.B20030.
文摘Palladium diselenide(PdSe_(2)),a novel two-dimensional(2D)material with a unique pentagonal crystal structure including anisotropic properties,has emerged as a highly promising candidate for developing the next generation photoelectronic devices.In this review,firstly,we have shed light on key figures of merit for polarization detection.After that,this review mainly highlights the structural and electronic properties of PdSe_(2)focusing on its strong polarization sensitivity,tunable bandgap,and excellent environmental stability,making it ideal for developing the photoelectronic devices such as broadband photodetectors and their further applications in polarization detection-based imaging systems.We also discuss challenges in scalable synthesis,material stability,and integration with other low-dimensional materials,offering future research directions to optimize PdSe_(2)for commercial applications.Owing to the outstanding optoelectronic properties of PdSe_(2),it stands at the forefront of optoelectronic materials,poised to enable new innovations in polarization photodetection.
基金Supported by the National Key Research and Development Program of China(2022YFA1404602)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB0580000)+3 种基金the National Natural Science Foundation of China(U23B2045,62305362)the Program of Shanghai Academic/Technology Research Leader(22XD1424400)the Fund of SITP Innovation Foundation(CX-461 and CX-522)Special Project to Seize the Commanding Heights of Science and Technology of Chinese Academy of Sciences,subtopic(GJ0090406-6).
文摘The polarization properties of light are widely applied in imaging,communications,materials analy⁃sis,and life sciences.Various methods have been developed that can measure the polarization information of a target.However,conventional polarization detection systems are often bulky and complex,limiting their poten⁃tial for broader applications.To address the challenges of miniaturization,integrated polarization detectors have been extensively explored in recent years,achieving significant advancements in performance and functionality.In this review,we focus mainly on integrated polarization detectors with innovative features,including infinitely high polarization discrimination,ultrahigh sensitivity to polarization state change,full Stokes parameters measure⁃ment,and simultaneous perception of polarization and other key properties of light.Lastly,we discuss the oppor⁃tunities and challenges for the future development of integrated polarization photodetectors.
基金The National Natural Science Foundation of China under contract No.41376183the High Resolution Images Services Special Projection for ocean applicationsthe Oceanography Public Welfare Scientific Research Project-Marine of China under contract No.201205012
文摘The SAR（Synthetic Aperture Radar） has the capabilities for all-weather day and night use. In the case of determining the effects of oil spill dumping, the oil spills areas are shown as dark spots in the SAR images.Therefore, using SAR data to detect oil spills is becoming progressively popular in operational monitoring, which is useful for oceanic environmental protection and hazard reduction. Research has been conducted on the polarization decomposition and scattering characteristics of oil spills from a scattering matrix using allpolarization of the SAR data, calculation of the polarization parameters, and utilization of the CPD（Co-polarized Phase Difference） of the oil and the sea, in order to extract the oil spill information. This method proves to be effective by combining polarization parameters with the characteristics of oil spill. The results show that when using Bragg, the oil spill backscattering machine with Enopy and a mean scatter α parameter. The oil spill can be successfully identified. However, the parameter mechanism of the oil spill remains unclear. The use of CPD can easily extract oil spill information from the ocean, and the polarization research provides a base for oil spill remote sensing detection.
基金supported by the National Key Laboratory of Electromagnetic Space Security(JCKY2023230C009).
文摘Imaging detection is an important means to obtain target information.The traditional imaging detection technology mainly collects the intensity information and spectral information of the target to realize the classification of the target.In practical applications,due to the mixed scenario,it is difficult to meet the needs of target recognition.Compared with intensity detection,the method of polarization detection can effectively enhance the accuracy of ground object target recognition(such as the camouflage target).In this paper,the reflection mechanism of the target surface is studied from the microscopic point of view,and the polarization characteristic model is established to express the relationship between the polarization state of the reflected signal and the target surface parameters.The polarization characteristic test experiment is carried out,and the target surface parameters are retrieved using the experimental data.The results show that the degree of polarization(DOP)is closely related to the detection zenith angle and azimuth angle.The(DOP)of the target is the smallest in the direction of light source incidence and the largest in the direction of specular reflection.Different materials have different polarization characteristics.By comparing their DOP,target classification can be achieved.
基金supported by grants from the International Science&Technology Cooperation Program of China(2009DFA32330)the Special Fund for Agro-scientific Research in the Public Interest(No.201203040)
文摘A fluorescence polarization immunoassay （FPIA） was developed for the analysis ofaflatoxins （AFs） using an anti-aflatoxin B1 （AFB1） monoclonal antibody and a novel fluorescein-labeled AFB1 tracer. The FPIA showed an IC50 value of 23.33 ng/mL with a limit of detection of 13.12 ng/mL for AFB1. The cross-reactivities of AFB1, AFB2, AFG1, AFG2, AFM1, and AFM2 with the antibody were 100%, 65.7%, 143%, 23.5%, 111.4%, and 2%, respectively. The group-specificity of anti-AFB1mAb indicated that the FPIA could potentially be used in a screening method for the detection of total AFs, albeit not AFG2 and AFM2. The total time required for analyzing 96 samples in one microplate was less than 5 rain. This study demonstrates the potential usefulness of the FPIA as a rapid and simple technique for monitoring AFs.
基金financially supported by Fundamental Research Funds for the Central Universities(Nos.10251210015,ZYTS23089 and 2020JCW-15)Guangdong Basic and Applied Basic Research Foundation(Nos.2021A1515110013 and 2021A1515110888)+1 种基金National Natural Science Foundation of China(Nos.22305182,51972204,22222505,21901195 and 22375121)Natural Science Basic Research Program of Shaanxi(Nos.2023-JCQN-0508 and 2023-JC-QN-0104)。
文摘Polarized-sensitive image sensors are a kind of photodetector with great development potential due to their enhanced ability to detect and identify the target objects from the aspect of spatial,spectral and polarized information.Recently,low-dimensional anisotropic materials with inherent anisotropic properties,ultrathin thickness,tunable bandgap and feasible integration with complementary metal oxide semiconductor(CMOS)fabrication processes have attracted great interest for their facilitation of polarized photodetector devices miniaturization.Maximizing the polarized detection performance of low-dimensional materials to satisfy realistic needs stimulates the exploration of modulation of anisotropic properties.In this review,we comprehensively introduce the latest research progress in modulating the optical and optoelectronic anisotropy characteristics of low-dimensional materials.The strategy of anisotropy regulation through crystal structure engineering and coupling system is discussed emphatically.Then,the latest progress in image recognition applications using anisotropic low-dimensional materials is reviewed in detail.Finally,we summarize the challenge and propose future opportunities in the practical application of polarized-sensitive imaging photodetectors based on low-dimensional anisotropic materials.
文摘Electrolysis tanks are used to smeltmetals based on electrochemical principles,and the short-circuiting of the pole plates in the tanks in the production process will lead to high temperatures,thus affecting normal production.Aiming at the problems of time-consuming and poor accuracy of existing infrared methods for high-temperature detection of dense pole plates in electrolysis tanks,an infrared dense pole plate anomalous target detection network YOLOv5-RMF based on You Only Look Once version 5(YOLOv5)is proposed.Firstly,we modified the Real-Time Enhanced Super-Resolution Generative Adversarial Network(Real-ESRGAN)by changing the U-shaped network(U-Net)to Attention U-Net,to preprocess the images;secondly,we propose a new Focus module that introduces the Marr operator,which can provide more boundary information for the network;again,because Complete Intersection over Union(CIOU)cannot accommodate target borders that are increasing and decreasing,replace CIOU with Extended Intersection over Union(EIOU),while the loss function is changed to Focal and Efficient IOU(Focal-EIOU)due to the different difficulty of sample detection.On the homemade dataset,the precision of our method is 94%,the recall is 70.8%,and the map@.5 is 83.6%,which is an improvement of 1.3%in precision,9.7%in recall,and 7%in map@.5 over the original network.The algorithm can meet the needs of electrolysis tank pole plate abnormal temperature detection,which can lay a technical foundation for improving production efficiency and reducing production waste.
基金support of the National Natural Science Foundation of China(Nos.62334010,62121005,and 62304221)the National Key Researchand Development Program(2021YFA0717600)the International Fund Program of Changchun Institute of Optics,Fine Mechanics andPhysics,ChineseAcademyofSciences.
文摘Polarization is an important attribute of light and can be artificially modulated as a versatile information carrier.Conventional polarization-sensitive photodetection relies on a combination of polarizing optical elements and standard photodetectors,which requires a substantial amount of space and manufacturing expenses.Although onchip polarized photodetectors have been realized in recent years based on two-dimensional(2D)materials with lowsymmetry crystal structures,they are limited by the intrinsic anisotropic property and thus the optional range of materials,the operation wavelength,and more importantly,the low anisotropic ratio,hindering their practical applications.In this work,we construct a versatile platform that transcends the constraints of material anisotropy,by integrating WSe2-based photodetector with MoS2-based field-effect transistor,delivering high-performance broadband polarization detection capability with orders of magnitude improvement in anisotropic ratio and on/off ratio.The polarization arises from hot electron injection caused by the plasmonic metal electrode and is amplified by the transistor to raise the anisotropic ratio from 2 to an impressive value over 60 in the infrared(iR)band,reaching the level of existing applications.Meanwhile,the system achieves a significant improvement in photosensitivity,with an on/off ratio of over 1o3 in the IR band.Based on the above performance optimization,we demonstrated its polarization-modulated IR optical communication ability and polarized artificial vision applications with a high image recognition accuracy of~99%.The proposed platform provides a promising route for the development of the longsought minimized,high-performance,multifunctional optoelectronic systems.
基金National Natural Science Foundation of China(U24A20317,52488301,62192773)West Light Foundation,Chinese Academy of Sciences(xbzg-zdsys-202307)Key Research Program of Frontier Science,Chinese Academy of Sciences(ZDBS-LY-JSC030)。
文摘Polarization detection is essential for various applications,ranging from biological diagnostics to quantum optics.Although various metasurface-based polarimeters have emerged,these platforms are commonly realized through spatial-division designs,which restrict detection accuracy due to inherent factors such as crosstalk.Here,we propose,to our knowledge,a novel strategy for high-accuracy,broadband full-Stokes polarization detection based on the analysis of a single vector beam,whose polarization profile varies sensitively and exhibits a one-to-one correspondence with the incident polarization.Based on this,the incident polarization is completely encoded into the field profile of the vector beam,which avoids crosstalk in principle,and results in high-accuracy polarization detection without any calibration process.As a proof of concept,a geometric-phase metasurface-based grafted perfect vector vortex beam(GPVVB)generator was designed and fabricated.Experimental results demonstrate that our method achieves polarization detection with an average relative error of 2.25%.Benefiting from the broadband high transmittance exceeding 95%of the metasurface due to the femtosecond laser-induced birefringence process,our method operates across a wavelength range of 450–1100 nm.Furthermore,the detection capability of the vector beam polarization profile was validated using a GPVVB-generating array.These results highlight the potential of our approach for transformative applications in polarization detection,including optical communication and machine vision.
基金Project supported by the National High Technology Research and Development Program of China(Grant No.2006AA12Z144)
文摘Theoretical analysis and experimental research on the polarization properties of output light in gyro are carried out to investigate the phenomenon that the amplitude of an output voltage signal is modulated by dither bias in laser gyros consisting of totally reflecting prisms. Taking the effect of prism stress birefringence into account, an analytical formula of the output light intensity in the gyro and the relationship between the polarization parameter and the amplitude modulation of the output signal are obtained and discussed. For the first time, the polarized power value of the output light is adopted as a basis to estimate the output signal amplitude fading extent of laser gyros. Experimental results demonstrate that when the value of polarized power of output light is below 25.5% of that in ideal static case, the standard error is over 0.0337 dBm, and the displacement extent of the prism is higher than 53% of the radius of the beam waist in the gyro cavity, the amplitude modulation extent of gyro output signal can reach up to 16%, which badly influences the measurement accuracy of the laser gyro. Using this polarized power detecting measurement method can repair the gyro immediately during its fabrication process, improve the testing and production efficiency and shorten the product development cycle.
基金Project supported by Shanghai Leading Academic DisciplineProject (Grant No .T0103) ,and Shanghai Post Doctoral Scienti-fic Research (Grant No .05R214122)
文摘A novel software implementation for current polarity detection and current compensation is presented. For a three-phase zero-voltage soft-switching （ZVS） PWM converter based on phase and amplitude control （PAC）, when saw-tooth carriers with alternate positive and negative slopes are adopted, the positive or negative slopes are chosen according to the phase current polarity. Since polarity reversal causes current distortion, current at the instant of reversal should be compensated for. Based on the characteristic of unity power factor converter in rectification and regeneration modes, a software implementation for current polarity detection is proposed. Distortion of current zero-crossing caused by using saw-tooth carriers with alternate positive and negative slopes is analyzed, and the relevant compensation method is proposed. Experimental study with a 1.5 kW device shows that phase current has a small harmonic content and power factor is high both in rectification and regeneration modes.
基金Project supported by the National Key Research and Development Program of China(No.2022YFB3206000)the Fundamental Research Funds for the Central Universities(No.2022QZJH29)+1 种基金the National Natural Science Foundation of China(Nos.92050115 and 42201336)the Zhejiang Provincial Natural Science Foundation of China(No.LZ21F050003)。
文摘Circular polarizers based on the metasurface suffer from a trade-off between the structural complexity and thepolarization extinction ratio (ER). Herein, we present a single-layer chiral metasurface with strong circular dichroism. Thestructure turns a circularly polarized incident beam into a linearly polarized beam, achieving a high circular polarization ER. Theoperating wavelength of the proposed metasurface is tunable by changing the geometric parameters. The metasurface's localizedsurface plasmon resonances between structures ensure strong chiral optical effects. We further experimentally demonstrate thecircular dichroism of the fabricated metasurface.
基金supported by the National Natural Science Foundation of China under Grant 51991384Anhui Provincial Major Science and Technology Project under Grant 202203c08020010。
文摘High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous motor.However,traditional methods require a large number of filters,which leads to the deterioration of system stability and dynamic performance.In order to solve these problems,a new signal demodulation method is proposed in this paper.The proposed new method can directly obtain the amplitude of high-frequency current,thus eliminating the use of filters,improving system stability and dynamic performance and saving the work of adjusting filter parameters.In addition,a new magnetic polarity detection method is proposed,which is robust to current measurement noise.Finally,experiments verify the effectiveness of the method.
基金supported by the Guangxi Natural Science Foundation(Nos.2025GXNSFDA069038)the Special Fund for Science and Technology Development of Guangxi(No.AD25069078)+4 种基金the Guangxi Natural Science Foundation(No.AA23073018)the National Natural Science Foundation of China(Nos.22175043 and 52162021)the Open Foundation of State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures(No.MMCS2023OF05)the Innovation Project of Guangxi Graduate Education(No.YCBZ2025046)the Innovation Project of Guangxi Graduate Education(No.YCSW2025092).
文摘Chiral organic-inorganic hybrid halides show significant potential for applications in circularly polarized photodetection,chiral-induced spin selectivity effects(CISS),and nonlinear optics.However,the widespread use of toxic lead element poses environmental concerns,hindering the further applications.Herein,we synthesized a zero-dimensional(0D)lead-free chiral antimony-based halide(R/S-MBA)_(4)Sb_(2)Br_(10)with the coexistence of polarity and crystallographic chirality.The halides exhibit unique magneto-chiroptical effects due to the field-effect-induced fine-tuning of exciton energy,which is the first observation in chiral antimony-based halides.Furthermore,owing to its significant spontaneous polarization(5.0μC/cm^(2))and optical chirality(g_(CD)=0.0018),(R/S-MBA)_(4)Sb_(2)Br_(10)halide exhibits excellent performance in self-powered circularly polarized photodetection,nonlinear optics,and CISS effects.The self-powered photodetector demonstrates high sensitivity with distinguishable factors(g_(res)=0.53/-0.51@0 V)and broad spectral response.The single crystal(R/S-MBA)_(4)Sb_(2)Br_(10)also exhibits a high second-harmonic polarization response asymmetry factor(g_(SHG-CD)=0.98/-0.70)and strong second-harmonic generation intensity.These performances are among the best reported for chiral halides.Our research not only sheds new light on the investigation of magneto-chiroptical phenomena,but also marks a significant advancement in realizing high-sensitivity circularly polarized light detection within the realm of lead-free polar materials.
基金National Natural Science Foundation of China(12404345,62375144)Tianjin Natural Science Foundation(22JCZDJC00160)+1 种基金Fundamental Research Funds for the Central Universities,Nankai University(63241331)China Postdoctoral Science Foundation(2023M731787)。
文摘Polarization-based detection technologies have broad applications across various fields.Integrating polarization with interferometric imaging holds significant promise for simultaneously capturing three-dimensional structure and polarization information.However,existing interferometric polarization measurement methods often rely on complex setups and sacrifice the acquisition rate or axial imaging range for parameter diversity.
