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Visualizing extended defects at the atomic level in a Bi_(2)Sr_(2)CaCu_(2)O8_(+σ) superconducting wire

Chinese Physics B 2024年第9期33卷 43-47页

作者： Kejun Hu Shuai Wang Boyu Li Ying Liu Binghui Ge Dongsheng Song Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China

The microstructure significantly influences the superconducting ***,the defect structures and atomic arrangements in high-temperature Bi_(2)Sr_(2)CaCu_(2)O8_(+σ) superconducting wire are directly characterized via stateof-the-art scanning transmission electron *** oxygen atoms are observed in both the charge reservoir layers and grain boundaries in the doped *** phases with varied numbers of CuO_(2) layers are found,and twist interfaces with different angles are *** study provides insights into the structures of Bi-2212 wire and lays the groundwork for guiding the design of microstructures and optimizing the production methods to enhance superconducting performance.

关键词： superconductor microstructure defect scanning transmission electron microscopy

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Metalens-based hybrid probe near-infrared endoscope objective

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Optics Express 2025年第3期33卷 5757-5768页

作者： Song, Yichen Mao, Shan Tang, Yufeng Zhao, Jianlin Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technology Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and Technology Northwestern Polytechnical University Xi’an710129 China Shaanxi Key Laboratory of Optical Remote Sensing and Intelligent Information Processing Xi’an710119 China

Rapid large-area deep tissue imaging at long working distances is important for clinical diagnosis. A near-infrared metalens-based hybrid probe con-focal micro-endoscope (pCM) objective with a large field of view of 500 µm, a long working distance of 300 µm, and a small caliber of 2.2 mm was designed, which is compatible with conventional endoscopes to produce cell-resolution images of deep tissues. The performance of the metalens-based hybrid objective optical system was analyzed. Results show that the metalens-based hybrid pCM significantly improves the imaging quality of such optical systems under the premise of meeting the design accuracy requirements, which provides a new solution and an effective realization for the design of such optical systems. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Infrared devices

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Cascaded chiral birefringent media enabled planar lens with programable chromatic aberration

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PhotoniX 2024年第1期5卷 411-423页

作者： Dewei Zhang Chun-Ting Xu Quan-Ming Chen Han Cao Hong-Guan Yu Qing-Gui Tan Yan-qing Lu Wei Hu National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and ManipulationCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210023China National Key Laboratory of Science and Technology on Space Microwave China Academy of Space TechnologyXi‘anChina

Wavefront control is the fundamental requirement in optical *** optics have drawn intensive attention due to the merits of compactness and light ***,it remains a challenge to freely manipulate the dispersion,hindering practical applications,especially in ***,we propose the concept of frequencysynthesized phase engineering to solve this problem.A phasefront-frequency matrix is properly designed to encode different spatial phases to separate frequencies,thus makes arbitrary dispersion tailoring and even frequency-separated functionalization *** periodically rotated director endows cholesteric liquid crystal with a spin and frequency selective ***,via presetting the local initial orientation of liquid crystal,geometric phase is encoded to the reflected *** verify the proposed strategy by cascading the chiral anisotropic optical media of specifically designed helical pitches and initial director *** this means,planar lenses with RGB achromatic,enhanced chromatic aberration and color routing properties are ***-sized and high-efficient lenses are fabricated with low crosstalk among *** releases the freedom of dispersion control of planar optics,and even enables frequency decoupled phase *** work brings new insights to functional planar optics and may upgrade the performance of existing optical apparatuses.

关键词： Liquid crystals Planar lens Dispersion programmable Spatial light modulation

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Coumarin derivative dye sensitized NaYGdF4:Yb,Er nanoparticles with enhanced NIR Ⅱ luminescence for bio-vascular imaging

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Journal of Rare Earths 2023年第12期41卷 1843-1849,I0001页

作者： Yaqun Ma Zhan Wang Yanxing Wang Zhenghao Liu Yukun Wang Ruichan Lv Xi'an Key Laboratory of Intelligent Sensing and Regulation of Trans-Scale Life Information Engineering Research Center of Molecular and Neuro ImagingMinistry of EducationSchool of Life Science and TechnologyXidian UniversityXi'an710071China

Lanthanide-doped biocompatible nanoparticles have promising applications in near-infrared second region imaging due to their high chemical stability,enhanced photostability and sharp emission ***,the weak light absorption capacity limits the application of rare-earth nanoparticles(RENPs) for *** prepared a coumarin-derived dye sensitized NaYGdF4:Yb,Er nanoparticle probe,in which the organic dye enhances photon absorption through the sensitization process,improving the luminescence efficiency of the rare earth particles near 1000 and 1500 *** addition,good water solubility and stability of the probe are imparted by coating the particles with amphiphilic polymers distearoyl phosphatidylethanolamine-polyethylene glycol(DSPE-PEG) and polyacrylic *** composite probe with good biocompatibility and NIR Ⅱ luminescence properties can be used for vascular imaging,providing a tool for the detection of hematologic-related diseases.

关键词： Rare earth doped nanoparticles Dye sensitization NIR imaging Angiography

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Three-axis high-sensitivity vibration sensor based on ultra-fine and ultra-short fiber Bragg gratings

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IEEE Sensors Journal 2025年第12期25卷 21557-21565页

作者： Yu, Chenbo Xin, Jingtao Liao, JingJing Li, Qihui Li, Kun Beijing Information Science & Technology University Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing100192 China Guangzhou Nansha Intelligent Photonic Sensing Research Institute Guangzhou511462 China Beijing Information Science & Technology University Beijing Laboratory of Optical Fiber Sensing and System Beijing100016 China

This paper presents a three-axis high-sensitivity vibration sensor based on ultra-fine and ultra-short fiber Bragg gratings (FBGs). A theoretical model for the sensor's sensitivity and natural frequency is developed by deriving equations for steady-state torque balance. The effects of spring plate thickness, fiber diameter, and FBG packaging length on sensor performance are analyzed by this model. Results show that spring plate thickness has almost no impact, reducing fiber diameter improves sensitivity, and shortening FBG packaging length increases natural frequency. Therefore, based on the ultra-fine and ultra-short fiber Bragg gratings, the sensor is 3D modeled and fabricated. The performance of the sensor is verified through finite element analysis and experiments. The experimental results show that the natural frequencies of the sensor in X, Y, and Z directions are 466 Hz, 477 Hz, and 445 Hz, respectively, with a working frequency band of 0-300 Hz, and sensitivities of 2258.4, 2240.8, and 2274.2 pm/g, respectively. The linearity in the three-axis directions reaches R² = 0.9998, and the minimum acceleration resolution is about 95 μg. The sensor's performance, characterized by high sensitivity, wide bandwidth, and excellent three-axis consistency, offering valuable insights for high-sensitivity sensor designs. © 2025 IEEE.

关键词： Fiber Bragg gratings

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Ultra-wideband matrix DFB laser array based on enhanced self-heating effect

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Optics Express 2025年第3期33卷 6304-6318页

作者： Fan, Yaqiang Sun, Zhenxing Zhang, Yue Lv, Yuan Xia, Haolin Zhang, Jingxuan Xu, Zhenzhen Wang, Wenxuan Xiao, Rulei Chen, Xiangfei National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences Institute of Optical Communication Engineering Nanjing University Key Laboratory of Intelligent Optical Sensing and Manipulation The Ministry of Education Nanjing210093 China Ocean College Jiangsu University of Science and Technology Zhenjiang212003 China

In this paper, an ultra-wideband distributed feedback (DFB) laser array with matrix grating based on the enhanced self-heating effect is proposed and experimentally demonstrated. 12 lasers are monolithically integrated with a 4 × 3 matrix style with a wavelength spacing of 5 nm. The reconstruction-equivalent-chirp technique is used to simplify the grating fabrication and enhance the precise control of the wavelength spacing. A cascaded Y-branch sharing identical active layers with the lasers is used to realize one waveguide output, which only requires a small current to compensate for the material absorption. This can reduce fabrication complexity compared to using the butt-coupling technique. A semiconductor optical amplifier (SOA) is integrated in front of the laser array to amplify and adjust the optical power. By optimizing the doping concentration of the p-waveguide region, the self-heating effect of the DFB laser has been enhanced, thereby increasing the wavelength current tuning range of a laser unit. As a result, the wavelength of the laser array is precisely controlled, with the wavelength deviation of all 12 lasers maintained within ±0.2 nm. The wavelength current tuning range of a DFB laser unit reaches 5.8 nm. Consequently, without adjusting the thermoelectric cooler (TEC), the laser array can achieve a continuous wavelength current tuning range of up to 60 nm. After SOA amplification, the output power of the laser array is above 55 mW, and the relative intensity noise (RIN) is lower than -130 dB/Hz. Additionally, its side-mode suppression ratio (SMSR) is greater than 45 dB, indicating excellent single-longitudinal-mode properties. The proposed tunable laser is considered highly advantageous for dense wavelength-division multiplexing (DWDM) systems and optical sensing systems. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Semiconductor optical amplifiers

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Recent Advances in Fiber-Optic Sensors for the Detection of Inorganic Acidic Gases

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Photonic Sensors 2024年第4期14卷 74-100页

作者： Lingnan KONG Yuanke GONG Xiaoyu ZHONG Yang LIU Bo WAN Quanhua XIE Yuanyuan HE Xiaoling PENG Haixing CHANG Dengjie ZHONG Huiling LIU Nianbing ZHONG Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection Chongqing Key Laboratory of Modern Photoelectric Detection Technology and InstrumentsChongqing Engineering Research Center of Intelligent Optical Fiber Sensing TechnologyChongqing University of TechnologyChongqing 400054China Meishan San Su Shrine Museum Meishan 620010China School of Chemistry and Chemical Engineering Chongqing University of TechnologyChongqing 400054China College of Computing and Informatics Sungkyunkwan UniversitySeoul 03060South Korea

An acidic gas is an important basic chemical raw material used for synthesizing fertilizers,insecticides,explosives,dyes,and ***,inorganic acidic gases that leak into the air have harmful effects on the human health,infrastructure,and cultural ***,the demand for inorganic acidic gas sensors for air quality monitoring and management has continuously increased,enabling the development of various sensing *** them,fiber-optic sensors are promising for acidic gas detection because of their excellent in-situ measurement,resistance to corrosion,anti-electromagnetic interference,long service life,and smart *** particular,fiber-optic sensors have proven to be very useful for the in-situ detection and distributed monitoring of multiple gas ***,the sensitivity,selectivity,repeatability,and limits of detection of these sensors can be improved to achieve acceptable performance levels for practical *** this review,we introduce fiber-optic sensors based on structured optical fibers and fiber gratings for detecting H_(2)S,SO_(2),NO_(2),CO_(2),and N_(2)*** structures of the sensing regions,gas-sensitive materials,and measurement principles of these sensors are *** sensitivity,selectivity,limit of detection,and response time of the sensors are ***,the future of fiber-optic sensors for the detection of inorganic acidic gases is discussed.

关键词： Fiber-optic sensors structured optical fibers fiber gratings inorganic acidic gases measurement principles sensing performance

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MEMS micro-mirror laser scanning for detection of metal corrosion

MEMS micro-mirror laser scanning for detection of metal corr...

引用

2023 International Conference on Optoelectronic Materials and Devices, ICOMD 2023

作者： Shen, Pengchao Zhai, Qingyi Liu, Huiling Yao, Jiannan He, Xuefeng He, Yuanyuan Xie, Quanhua Liu, Yang Peng, Xiaoling Zhong, Nianbing Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection Chongqing Key Laboratory of modern photoelectric detection technology and instruments Chongqing Engineering Research Center of Intelligent Optical Fiber Sensing Technology Chongqing University of Technology Chongqing400054 China

ISBN: (纸本)9781510674509

To achieve non-contact non-destructive detection of corrosion in metal artifacts, this paper presents a novel metal corrosion detection system employing a pulsed modulation laser source, MEMS scanning micro-mirror, optical lens assembly, photoelectric detector, and FPGA. The detection system's measurement theoretical model is established, and corrosion measurements are conducted on corroded metal samples using the developed system. The research reveals that corrosion products adhering to the surface of metal samples reduce the reflectance of light, leading to a decrease in the light flux reaching the photoelectric detector and a subsequent reduction in the output voltage of the detection system. The corrosion intensity of metal artifacts can be detected by acquiring the output voltage of the detection system. Simultaneously, the corrosion behavior characteristics of metallic specimens can be identified based on the scanning voltage of the detection system. © 2024 SPIE. All rights reserved.

关键词： MEMS

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Fiber Bragg gratings inscription with a single UV laser pulse by high-temperature arc pretreatment

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Optics Express 2025年第10期33卷 21692-21706页

作者： Xin, Jingtao Liao, Jingjing Yu, Chenbo Li, Qihui Zhu, Lianqing Beijing Information Science and Technology University Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing100101 China Guangzhou Nansha Intelligent Photonic Sensing Research Institute Guangzhou100094 China Beijing Information Science and Technology University Beijing Laboratory of Optical Fiber Sensing and System Beijing130033 China

This study proposes a high-temperature arc discharge pretreatment method to enhance the photosensitivity of hydrogen-loaded germanium-doped fibers for single-pulse FBG inscription. By coupling hydrogen diffusion dynamics with hydroxyl reaction kinetics, a numerical model based on Fick’s law and Arrhenius equations was established. Finite difference analysis revealed that 400°C with 50 ms heating maximizes hydroxyl concentration while suppressing hydrogen escape. In the experiments study, the pretreatment temperature and duration are controlled by adjusting the electrode discharge power and discharge time. The effectiveness of fiber sensitization is verified through single-pulse grating writing using a phase mask and a 248 nm ultraviolet laser. After optimizing the heat treatment parameters, fiber Bragg gratings (FBGs) with a reflectivity exceeding 83.7% were successfully written using a single pulse laser of 160mJ, representing a 130-fold improvement compared to the results obtained without heat treatment. This method not only enhances the efficiency of FBG writing but also fundamentally mitigates the issue of grating erasure, significantly reducing the stability requirements for the writing system. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Fiber Bragg gratings

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Solar evaporation for simultaneous oil-water separation and electricity generation with Janus wood-based absorbers

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Frontiers of Environmental Science & Engineering 2024年第2期18卷 13-23页

作者： Yue Yang Ze Fu Qi Zhang Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science&TechnologyNanjing 210094China Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructuresCollege of Engineering and Applied SciencesKey Laboratory of Intelligent Optical Sensing and Manipulation(Ministry of Education)Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210093China

Oily wastewater from ocean oil spills endangers marine ecosystems and human health. Therefore, developing an effective and sustainable solution for separating oil-water mixtures is urgent. Interfacial solar photothermal evaporation is a promising approach for the complete separation of two-phase mixtures using only solar energy. Herein, we report a carbonized wood-based absorber with Janus structure of comprising a hydrophobic top-layer and an oleophobic bottom-layer for simultaneous solar-driven oil-water separation and electricity generation. Under sunlight irradiation, the rapid evaporation of seawater will induce a separation of oil-water mixtures, and cause a high salt concentration region underlying the interface, while the bottom “bulk water” maintains in a low salt concentration, thus forming a salinity gradient. Electricity can be generated by salinity gradient power. Therefore, oil-water separation efficiency of > 99% and derived extra electricity power of ~0.1 W/m2 is achieved under solar radiation, demonstrating the feasibility of oil-water separation and electricity production synchronously directly using solar energy. This work provides a green and cost-effective path for the separation of oil-water mixtures.

关键词： Oily wastewater Carbonized wood Salinity gradient Electricity generation Solar irradiation

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