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Microwave Pulse Generation Based on Active Mode-Locking Coupled optoelectronic Oscillator

Microwave Pulse Generation Based on Active Mode-Locking Coup...

2023 Asia Communications and Photonics Conference/2023 International Photonics and optoelectronics Meetings, ACP/POEM 2023

作者： Li, Juncheng Wang, Zhengtao Zhang, Yali Gao, Tingchuan Li, Shouhai Zhang, Zhiyao Zhang, Shangjian Liu, Yong University of Electronic Science and Technology of China State Key Laboratory of Electronic Thin Films and Integrated Devices China School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Research Center for Microwave Photonics Chengdu China

ISBN: (纸本)9798350312614

In this paper, we propose an active mode-locking coupled optoelectronic oscillator (AML-COEO) to generate microwave pulses. Fundamental frequency and harmonic AML-COEOs have been demonstrated by controlling the external low-frequency sinusoidal signal, which replaces the direct-current bias voltage and is directly applied to the bias port of the sharing modulator in the proposed AML-COEO. It is believed that this generation method will enrich the application of the COEO in the pulse Doppler radar. © 2023 IEEE.

关键词： Active mode-locking Coupled optoelectronic oscillator Microwave pulse

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Approaching 18% efficiency of ternary organic photovoltaics with wide bandgap polymer donor and well compatible Y6 : Y6-1O as acceptor

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National Science Review 2021年第8期8卷 20-29页

作者： Xiaoling Ma Anping Zeng Jinhua Gao Zhenghao Hu Chunyu Xu Jae Hoon Son Sang Young Jeong Caixia Zhang Mengyang Li Kai Wang He Yan Zaifei Ma Yongsheng Wang Han Young Woo Fujun Zhang Key Laboratory of Luminescence and Optical Information Ministry of EducationBeijing Jiaotong University Organic Optoelectronic Materials Laboratory Department of ChemistryCollege of ScienceKorea University Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology Department of Chemistry The Hong Kong University of Science and Technology Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua University

A series of ternary organic photovoltaics(OPVs) are fabricated with one wide bandgap polymer D18-Cl as donor, and well compatible Y6 and Y6-1O as acceptor. The open-circuit-voltage(V)of ternary OPVs is monotonously increased along with the incorporation of Y6-1O, indicating that the alloy state should be formed between Y6 and Y6-1O due to their excellent compatibility. The energy loss can be minimized by incorporating Y6-1 O, leading to the VOC improvement of ternary OPVs. By finely adjusting the Y6-1O content, a power conversion efficiency of 17.91% is achieved in the optimal ternary OPVs with 30 wt% Y6-1O in acceptors, resulting from synchronously improved short-circuit-current density(JSC) of 25.87 mA cm, fill factor(FF) of 76.92% and VOC of 0.900 V in comparison with those of D18-Cl : Y6 binary OPVs. The JSC and FF improvement of ternary OPVs should be ascribed to comprehensively optimal photon harvesting, exciton dissociation and charge transport in ternary active layers. The more efficient charge separation and transport process in ternary active layers can be confirmed by the magnetophotocurrent and impedance spectroscopy experimental results, respectively. This work provides new insight into constructing highly efficient ternary OPVs with well compatible Y6 and its derivative as acceptor.

关键词： organic photovoltaics power conversion efficiency ternary strategy photon harvesting morphology regulation

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Efficient p-doping of P3HT for hole transporting materials in perovskite solar cells

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Rare Metals 2022年第8期41卷 2575-2581页

作者： Su-Peng Liu Xin-Can Qiu Jing Guo Ping-An Chen Yu Liu Huan Wei Jiang-Nan Xia Hai-Hong Xie Yuan-Yuan Hu Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education and International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan Province School of Physics and ElectronicsHunan UniversityChangsha410082China Shenzhen Research Institute of Hunan University Shenzhen518063China

Developing hole transporting materials(HTMs)appropriate for large-area and high-performance perovskite solar cells(PSCs)is an important *** this work,we report using a widely used organic semiconductor P3 HT in combination with an efficient organic salt dopant trityl tetrakis(pentafluorophenyl)borate(TrTFPB)as HTM in *** is shown that the dopant can significantly enhance the conductivity of P3 HT while slightly change the film *** doping P3 HT with different doping levels.

关键词： morphology. doping perovskite

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High performance and stable pure-blue quasi-2D perovskite light-emitting diodes by multifunctional zwitterionic passivation engineering

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Advanced Photonics 2024年第2期6卷 32-40页

作者： Chao Shen Shuyan Fang Jibin Zhang Xiangfei Liang Chenhui Su Jian Qing Wanzhu Cai Yunhan Luo Renqiang Yang Lintao Hou Jinan University College of Physics and Optical EngineeringGuangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsGuangzhou Key Laboratory of Vacuum Coating Technologies and New Energy MaterialsGuangzhouChina Jinan University College of Physics and Optical EngineeringGuangdong Provincial Key Laboratory of Optical Fiber Sensing and CommunicationsGuangzhouChina Zhengzhou University School of Physics and MicroelectronicsKey Laboratory of Materials Physics of Ministry of EducationZhengzhouChina Jinan University Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education InstitutesGuangzhouChina Jianghan University School of Optoelectronic Materials and TechnologyKey Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of EducationWuhanChina

Despite the rapid advances of red and green perovskite light-emitting diodes(Pe LEDs),achieving high brightness with high external quantum efficiency(EQE)remains a challenge for the pure-blue Pe LEDs,which greatly hinders their practical applications,such as white-light illumination and in optical communication as a high-speed and low-loss light ***,we report a high-performance pure-blue Pe LED based on mixed-halide quasi-2D perovskites incorporated with a zwitterionic molecule of 3-(benzyldimethylammonio)propanesulfonate(3-BAS).Experimental and density functional theory analysis reveals that 3-BAS can simultaneously eliminate non-radiative recombination loss,suppress halide migration,and regulate phase distribution for smoothing energy transfer in the mixed-halide quasi-2D perovskites,leading to the final perovskites with high photoluminescence quantum yield and robust spectrum ***,the highperformance pure-blue Pe LED with a recorded brightness with 1806 cd m-2and a relative higher EQE of 9.25%is achieved,which is successfully demonstrated in a visible light communication system for voice signal *** pave the way for achieving highly efficient pure-blue Pe LEDs with great application potential in future optical communication networks.

关键词： pure-blue PeLEDs quasi-2D perovskite zwitterionic additive visible light communication

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FLIM monitors mitochondrial responses to microplastics in KYSE-150 cells 17

FLIM monitors mitochondrial responses to microplastics in KY...

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17th International Conference on Photonics and Imaging in Biology and Medicine, PIBM 2024

作者： Wu, Wenzhong Song, Haiying Wen, Qiao Deng, Yifeng Li, Changjiang Sun, Wei Lu, Zhen Peng, Xiao Yan, Wei Qu, Junle College of Physics and Optoelectronic Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen University Shenzhen518060 China Department of Nephrology The First Affiliated Hospital of Shenzhen University Shenzhen Second People's Hospital Guangdong Province Shenzhen518035 China Shandong Key Laboratory of Coastal Environmental Processes YICCAS Yantai264003 China School of Medical Engineering and Technology Xinjiang Medical University Urumqi810017 China

ISBN: (数字)9781510688070

ISBN: (纸本)9781510688063

As plastic pollution escalates, microplastics, particles less than 5 mm, have attracted significant attention due to their origins in everyday plastic waste, microbeads in personal care products, and bottled water packaging, posing threats to ecosystems and health. Polystyrene (PS), one type of widely used plastics, affect human health via absorption, ingestion, and dermal contact. In this study, we used microscopy methods to monitor the invasion progress of PS microplastics into KYSE-150 cells and to study the following influence of this invasion on the cellular status. Firstly, the mitochondrial probe Rhodamine 123 was used to label KYSE-150 cells, which indicated the mitochondrial status during the exposure of PS. Then the KYSE-150 cells were treated with fluorescent PS microspheres (approximately 100 nm in diameter) for one day. During this process, cells were observed by using both a confocal microscopy system and a fluorescence lifetime imaging microscopy (FLIM) system. Results showed that the microplastics appeared in the cell cytoplasm within 1 hour. The amount of microplastics within the cells kept increased till 24 hours. Images of incubated cells at each time point (1 h, 3 h, 6 h or 24 h) were collected by using the FLIM system and then analyzed with the software SPCImage. The data showed that the fluorescence lifetime values of R123 in the mitochondria of microplastic treated cells increased according to the incubation time. By contrast, the lifetime values in the control group (cells without PS) kept constant during the same period. These results showed that changes of lifetime values might be due to the accumulation of microplastics within the cells. Briefly, this study suggested that FLIM could be a rapid, non-destructive, and sensitive method suitable to monitor the invasion of microplastics into live cells, providing appropriate data to the toxicity assessment of microplastics. © 2025 SPIE.

关键词： Mitochondria

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Ultrasonic A-Scan Image detection for 3D Braided Composites Based on Convolutional Neural Network 2021

Ultrasonic A-Scan Image Detection for 3D Braided Composites ...

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7th International Conference on Computing and Artificial Intelligence, ICCAI 2021

作者： Xiao, Zhitao Guo, Quan Guo, Yongmin Huang, Yalong School of Life Sciences Tianjin Key Laboratory of Optoelectronic Detection Technology and System Tiangong University Tianjin300387 China School of Electronics and Information Engineering Tianjin Key Laboratory of Optoelectronic Detection Technology and System Tiangong University Tianjin300387 China School of Mechanical Engineering Tianjin Key Laboratory of Optoelectronic Detection Technology and System Tiangong University Tianjin300387 China

ISBN: (纸本)9781450389501

Automatic ultrasonic signal classification of 3D braided composites is finding increasing use in many applications for the interpretation of signals. In this paper, we present a method for ultrasonic A-scan image classification based on deep convolutional neural network (CNN) model. The ultrasonic signal data set was obtained from Olympus Omniscan MX2 and divided into training data set and test data set. The batch normalization layer and the inception layer followed by max pool layer are added to the CNN model, which can speed up convergence of the deep learning network and improve the accuracy. With CNN model used for training the signals with debongding and the non-defect signals, experimental results showed that the accuracy rate of the method we proposed in the test data set reached 99.55%, which was greatly improved compared with AlexNet model and ResNet-34 network. © 2021 ACM.

关键词： Neural network models

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Super-resolution filtered ghost imaging with compressed sensing

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Chinese Physics B 2020年第12期29卷 119-124页

作者： Shao-Ying Meng Wei-Wei Shi Jie Ji Jun-Jie Tao Qian Fu Xi-Hao Chen Ling-An Wu Key Laboratory of Optoelectronic Devices and Detection Technology School of PhysicsLiaoning UniversityShenyang 110036China Institute of Physics Chinese Academy of SciencesBeijing 100190China

A filtered ghost imaging(GI)protocol is proposed that enables the Rayleigh diffraction limit to be exceeded in an intensity correlation system;a super-resolution reconstructed image is achieved by low-pass filtering of the measured *** a lensless GI experiment performed with spatial bandpass filtering,the spatial resolution can exceed the Rayleigh diffraction bound by more than a factor of *** resolution depends on the bandwidth of the filter,and the relationship between the two is investigated and *** combination with compressed sensing programming,not only high resolution can be maintained but also image quality can be improved,while a much lower sampling number is sufficient.

关键词： ghost imaging bandpass filtering compressed sensing super resolution

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Dual-symmetry-perturbed all-dielectric resonant metasurfaces for high-Q perfect light absorption

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Chinese Optics Letters 2024年第2期22卷 200-206页

作者：葛俊洋高一骁徐雷周宁沈祥 Laboratory of Infrared Materials and Devices Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Ningbo 315211China Advanced Optics&Photonics Laboratory Department of EngineeringSchool of Science and TechnologyNottingham Trent UniversityNottingham NG118NSUK School of Physics and Optoelectronic Engineering Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China Ningbo Institute of Oceanography Ningbo 315832China

We demonstrate a high-Q perfect light absorber based on all-dielectric doubly-resonant *** bound states in the continuum(BICs)protected by different symmetries,we manage to independently manipulate the Q factors of the two degenerate quasi-BICs through dual-symmetry perturbations,achieving precise matching of the radiative and nonradiative Q factors for degenerate critical *** achieve a narrowband light absorption with a>600 Q factor and a>99%absorptance atλ_(0)=1550 nm on an asymmetric germanium metasurface with a 0.2λ_(0)*** work provides a new strategy for engineering multiresonant metasurfaces for narrowband light absorption and nonlinear applications.

关键词： resonant metasurface perfect light absorption bound states in the continuum

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Nitrogen air lasing induced by multiple filaments array

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optoelectronics Letters 2022年第6期18卷 354-359页

作者： ZHU Di LI Chunhua GAO Zhongkun SUN Xiaodong GAO Hui Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems Tianjin 300387China School of Electronics and Information Engineering Tiangong UniversityTianjin 300387China School of Life Science Tiangong UniversityTianjin 300387China School of Physical Science and Technology Tiangong UniversityTianjin 300387China

Air lasing emission by launching intense ultrafast laser pulses in atmosphere has recently attracted increasing interest in the ultrafast laser science and atmospheric science fields,especially for remote sensing *** demonstrated the fluorescence emissions at 337 nm,357 nm and 391 nm induced by multiple filaments using four kinds of step phase *** results have indicated that the fluorescence signal has been amplified as it propagates along the filament through amplified spontaneous emission(ASE),and the fluorescence intensity is also enhanced in the backward direction via multiple ***,the gain coefficient through ASE is increased with the number of filaments.

关键词： lasing multiple backward

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Recent progress on mechanisms,principles,and strategies for high-activity and high-stability non-PGM fuel cell catalyst design

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Carbon Energy 2024年第5期6卷 25-52页

作者： Yuping Yuan Yun Zheng Dan Luo Weibin Qiu Jiantao Wang Xin Wang Zhongwei Chen GRINM(Guangdong)Institute of New Materials Technology FoshanChina Department of Chemical Engineering Waterloo Institute for NanotechnologyWaterloo Institute for Sustainable EnergyUniversity of WaterlooWaterlooOntarioCanada Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangdongChina National Power Battery Innovation Center GRINM Group Co.Ltd.BeijingChina

The commercialization of a polymer membrane H2-O2 fuel cell and its widespread use call for the development of cost-effective oxygen reduction reaction(ORR)nonplatinum group metal(NPGM)***,to meet the requests for the real-world fuel cell application and replacing platinum catalysts,it still needs to address some challenges for NPGM catalysts regarding the sluggish ORR kinetics in the cathode and their poor durability in acidic *** response to these issues,numerous efforts have been made to study NPGM catalysts both theoretically and experimentally,developed these into the atomically dispersed coordinated metal-nitrogen-carbon(M-N-C)form over the past *** this review,we present a comprehensive summary of recent advancements on NPGM catalysts with high activity and *** design strategies in terms of optimizing active-site density and enhancing catalyst stability against demetalization and carbon corrosion are *** is also emphasized the importance of understanding the mechanisms and principles behind those strategies through a combination of theoretical modeling and experimental ***,further understanding the mechanisms related to the active-site structure and the formation process of the single-atom active site under pyrolysis conditions is critical for active-site *** the active-site distance is the basic principle for improving catalyst activity through increasing the catalyst active-site *** studies for the catalyst deactivation mechanism and modeling stable active-site structures provide both mechanisms and principles to improve the NPGM catalyst ***,currently remained challenges and perspectives in the future on designing high-performance atomically dispersed NPGM catalysts toward fuel cell application are discussed.

关键词： batteries electrocatalysis energy storage and conversion fuel cells

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