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Efficient concentration of trace analyte with ordered hotspot construction for a robust and sensitive SERS platform

International Journal of Extreme Manufacturing 2024年第3期6卷 532-542页

作者： Youdi Hu Yanlei Hu Zhenyu Wang Jiale Yong Wei Xiong Dong Wu shixiang xu Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenGuangdong 518060People’s Republic of China CAS Key Laboratory of Mechanical Behavior and Design of Materials Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education InstitutesDepartment of Precision Machinery and Precision InstrumentationUniversity of Science and Technology of ChinaHefeiAnhui 230027People’s Republic of China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhanHubeiPeople’s Republic of China

Surface-enhanced Raman scattering(SERS)platform,which enables trace analyte detection,has important application *** structuring/modifying the surface of the SERSsubstrate,analyte in highly diluted solutions can be concentrated into localized active areas for highly sensitive ***,subject to the difficulty of the fabrication process,itremains challenging to balance hot-spot construction and the concentration capacity of analyte ***,preparing SERS substrates with densely ordered hot spots andefficient concentration capacity is of great significance for highly sensitive ***,we propose an Ag and fluoroalkyl-modified hierarchical armour substrate(Ag/F-HA),which has a double-layer stacking design to combine analyte concentration with hotspot *** microarmour structure is fabricated by femtosecond-laser processing to serve as asuperhydrophobic and low-adhesive surface to concentrate analyte,while the anodic aluminium oxide(AAO)template creates a nanopillar array serving as dense and ordered hot *** the synergistic action of hot spots and analyte concentration,Ag/F-HA achieves a detectionlimit down to 10^(-7)M doxorubicin(DOX)molecules with a RSD of 7.69%.Additionally,Ag/F-HA exhibits excellent robustness to resist external disturbances such as liquid splash or *** on our strategy,SERS substrates with directional analyte concentrations are further explored by patterning microcone arrays with *** work opens a way to the realistic implementation of SERS in diverse scenarios.

关键词： surface-enhanced Raman scattering anodic aluminium oxide femtosecond laser processing concentration of trace analytes mechanical robustness

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基于证据推理的隧道坍塌多源信息融合评估

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湖南大学学报（自然科学版） 2024年第1期51卷 190-200页

作者：丘伟兴赵炼恒吴波单凌志徐世祥中南大学土木工程学院湖南长沙410075 广西大学土木建筑工程学院广西南宁530004 东华理工大学土木与建筑工程学院江西南昌330013 中咨规划设计研究有限公司北京100020

由于影响因素众多,隧道坍塌风险评估是一个多属性决策问题.单源信息评估方法难以充分考虑所有的风险因素,导致预测结果存在偏差.为了评估隧道坍塌风险并提供更准确的风险控制策略,本研究提出了一种新的多源信息融合方法,该方法将云模型(... 详细信息

由于影响因素众多,隧道坍塌风险评估是一个多属性决策问题.单源信息评估方法难以充分考虑所有的风险因素,导致预测结果存在偏差.为了评估隧道坍塌风险并提供更准确的风险控制策略,本研究提出了一种新的多源信息融合方法,该方法将云模型(CM)、支持向量机(SVM)和基于证据推理(ER)相结合.对多个信息源进行分析,得到不同的坍塌风险评估模型(目视检查数据通过SVM获取分类概率值,监测数据通过云模型获取概率值).每个模型的质量都由可信度和重要性权重来评价.然后运用ER规则融合各个评估模型的结果,给出总体的坍塌概率风险评估.与D-S理论相比,ER规则在处理高冲突信息方面具有更大的优势.当不同信息源的风险评估结果不一致时,D-S理论的融合结果往往会与常识相反,ER规则融合由于考虑了评估模型的重要性权重和可信度,更适用于高冲突信息的融合.该方法已成功应用于福建莆炎高速公路的鱼塘溪隧道.结果表明,所提出的多源信息融合方法的评价准确率为87.5%,而单源信息融合方法的评价准确率小于70%.此外,即使不同模型的风险结果存在较大的冲突,该融合模型也具有良好的性能.

关键词：隧道坍塌风险评估云模型支持向量机证据理论

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盾构双线隧道随机有限差分法地表变形研究

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铁道工程学报 2024年第1期41卷 60-66页

作者：吴波郑卫强夏倩朱若男曾佳佳王吾浩徐世祥东华理工大学南昌330013

研究目的:准确预测盾构双线隧道开挖引起的地表问题对保障线路周边安全十分重要。基于随机场理论框架,将非侵入式随机分析、有限差分法和响应面法有机耦合,建立非侵入式盾构双线隧道地表变形分析有限差分模型,系统研究土体参数与双线隧... 详细信息

研究目的:准确预测盾构双线隧道开挖引起的地表问题对保障线路周边安全十分重要。基于随机场理论框架,将非侵入式随机分析、有限差分法和响应面法有机耦合,建立非侵入式盾构双线隧道地表变形分析有限差分模型,系统研究土体参数与双线隧道间距对地表变形的影响特性。研究结论:(1)土体参数变异系数与双隧间距对地表变形特征曲线变化影响明显;(2)地表变形曲线特征与土层参数随机分布密切相关,由于低刚度占优效应与模量呈现对数正态分布;(3)相较蒙特卡罗法,PCE法的计算精度相近,精度随阶数增加而提升,计算效率优势突出;(4)本研究成果可为设计参数选取提供一种快速可靠简便方法,也可为类似工程提供参考。

关键词：双线隧道随机有限差分法地表变形可靠度土体参数变异性

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Generation of ultrafast radially polarized pulses through chirp-assisted femtosecond optical parametric amplification

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 51-57页

作者： SaiSai Hu JieFeng Huang XinHao Ren ChangWen xu shixiang xu DianYuan Fan HaiZhe Zhong International Collaborative Laboratory of 2D Materials for Optoelectronic Science&Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Radially polarized beams characterized by an axially symmetric polarization distribution can be sharply focused to produce strong longitudinal fields in the *** applications of these beams will be facilitated by the availability of higher powers and shorter ***,the ultrafast radially polarized pulse is typically generated via wavefront reconstruction from conventional linearly polarized *** pulse duration and intensity limits are strictly dependent on extra-cavity ***,a chirp-assisted near-degenerate type-II parametric process is presented as a pulse-energy-scalable method of accessing ultrafast radially polarized *** a proof-of-principle experiment,the broadband gain balance between the orthogonally polarized signal components was realized via controlling the chirp of the pump *** an analogous pulseduration transfer effect,the radially polarized signal inherited the temporal and spectral characteristics of the pump pulse and maintained the radial polarization state of each frequency component of the *** a shorter pump pulse,the generation of few-cycle radially polarized pulses should be achievable,which may facilitate a wide range of ultrafast applications such as vacuum electron acceleration and high-harmonic generation.

关键词： radially polarized beam optical parametric amplifier ultrafast lasers spectral broadening optical parametric phase

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Recent progress in multi-wavelength fiber lasers:principles,status,and challenges

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Chinese Optics Letters 2020年第4期18卷 36-62页

作者： Hualong Chen Xiantao Jiang shixiang xu Han Zhang SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology Collaborative Laboratory of 2D Materials for Optoelectronic Science and Technology of Ministry of EducationCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

In recent years,multi-wavelength fiber lasers play a significant role in plenty of fields,ranging from optical communications to mechanical processing and laser biomedicine,owing to their high beam quality,low cost,and excellent heat dissipation *** from increasing maturity of optical elements,the multi-wavelength fiber laser has made rapid *** this review,we summarize and analyze diverse implementation methods covering continuous wave and pulsed fiber lasers at room temperature conditions:inserting an optical filter device and intensity-dependent loss structure in the resonant cavity,and applying ultrafast nonlinear optical response of materials and a dual-cavity ***,future challenges and perspectives of the multi-wavelength fiber laser are discussed and addressed.

关键词： multi-wavelength fiber laser optical filter nonlinear polarization rotation nonlinear amplification loop mirror 2D materials

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糖萜素对蛋鸽产蛋性能、蛋品质、蛋营养成分的影响

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动物营养学报 2024年第8期36卷 5076-5084页

作者：董丽艳李瑞萍任逸懿吴春琴徐时湘钟声亮温州科技职业学院(温州市农业科学研究院) 温州325006 平阳县星亮鸽业有限公司温州325402

本试验旨在研究糖萜素对蛋鸽产蛋性能、蛋品质以及蛋营养成分的影响。选取7月龄双母配对成功的白羽王鸽2000对,随机分为5组(每组5个重复,每个重复80对),对照组饲喂基础饲粮,试验组饲喂在基础饲粮中分别添加250、500、750、1000 mg/kg糖... 详细信息

本试验旨在研究糖萜素对蛋鸽产蛋性能、蛋品质以及蛋营养成分的影响。选取7月龄双母配对成功的白羽王鸽2000对,随机分为5组(每组5个重复,每个重复80对),对照组饲喂基础饲粮,试验组饲喂在基础饲粮中分别添加250、500、750、1000 mg/kg糖萜素的试验饲粮,试验期1年。结果表明:1)相较于对照组,饲粮添加750 mg/kg的糖萜素显著提高了产蛋量(P0.05),同时降低了死淘率。以各组年产蛋量为判断指标,通过二次曲线拟合分析,推荐糖萜素添加量为776 mg/kg。2)相较于对照组,饲粮添加750 mg/kg的糖萜素可使鸽蛋的蛋黄颜色极显著提高(P0.05)。3)相较于对照组,饲粮添加750 mg/kg的糖萜素可以显著提高鸽蛋中氨基酸总量、脂肪酸总量,尤其是多不饱和脂肪酸含量(P0.05)。由此可见,饲粮添加糖萜素能提高蛋鸽产蛋性能,其中添加750 mg/kg的糖萜素效果最佳,能改善蛋黄颜色,提高蛋黄重,提高氨基酸总量、脂肪酸总量,尤其是不饱和脂肪酸含量。

关键词：糖萜素鸽产蛋性能蛋品质营养成分

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Switchable dual-wavelength Q-switched fiber laser using multilayer black phosphorus as a saturable absorber

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Photonics Research 2018年第3期6卷 198-203页

作者： JUNMIN LIU Yu CHEN YING LI HAN ZHANG SHUIQIN ZHENG shixiang xu Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology College of Electronic Science and TechnologyShenzhen UniversityShenzhen 518060China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Optoelectronic EngineenngShenzhen UniversityShenzhen 518060China

Black phosphorus(BP), with thickness-dependent direct energy bandgaps(0.3–2 eV), shows an enhanced nonlinear optical response at near-and mid-infrared wavelengths. In this paper, we present experimentally multilayer BP flakes coated on microfiber(BCM) as a saturable absorber with a modulation depth of 16% and a saturable intensity of 6.8 MW∕cm^2. After inserting BCM into an Er-doped fiber ring laser, a stable dual-wavelength Q-switched state with central wavelengths of 1542.4 nm and 1543.2 nm(with wavelength spacing as small as 0.8 nm) is obtained with the aid of two cascaded fiber Bragg gratings as a coarse wavelength ***, single-wavelength Q-switched operation at 1542.4 nm or 1543.2 nm is also realized, which can be switched between the two wavelengths flexibly just by adjusting the intracavity birefringence. These results suggest that BP combined with the cascaded fiber gratings can provide a simple and feasible candidate for a multiwavelength fiber laser. Our fiber laser may have potential applications in terahertz generation, laser radar,and so on.

关键词： length Switchable dual-wavelength Q-switched fiber laser using multilayer black phosphorus as a saturable absorber EDF

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Single-shot real-time imaging of ultrafast light springs

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Science China(Physics,Mechanics & Astronomy) 2021年第12期64卷 130-137页

作者： Chengzhi Jin Dalong Qi Yunhua Yao Fengyan Cao Li Deng shixiang xu Zhenrong Sun Shian Zhang State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Physics and Electronic Science East China Normal UniversityShanghai 200241China Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology College of Physics and Optoelectronics EngineeringShenzhen UniversityShenzhen 518060China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Light springs(LSs) have played essential roles in particle rotation and manipulation, optical super-resolution imaging, and optical information coding. In related research areas, it is important to accurately measure spatiotemporal information on LSs to understand and analyze their applications. However, there is no experimental method that can accurately detect the drastic spatial evolution of ultrafast LSs to date. Therefore, in this study, we propose a compressed ultrafast photography(CUP) technique to observe LSs in spatial and temporal dimensions with a snapshot. Using our home-built CUP system, we successfully capture spatiotemporal information on picosecond LSs with two and four petals, involving spatial structure and rotation velocity;furthermore, the experimental measurements are in good agreement with theoretical simulations. This study provides a novel visualization method for specifically measuring the spatial structure and temporal evolution of LSs, thus establishing a new idea for accurately characterizing spatiotemporal information on complex ultrafast laser fields.

关键词： spatio-temporal light springs compressed ultrafast photography computational imaging single shot

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High-gain amplification for femtosecond optical vortex with mode-control regenerative cavity

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Photonics Research 2020年第8期8卷 1375-1380页

作者： SHUIQIN ZHENG ZHENKUAN CHEN QINGGANG LIN YI CAI XIAOWEI LU YANXIA GAO shixiang xu DIANYUAN FAN Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology College of Physics and Optoelectronics EngineeringShenzhen UniversityShenzhen 518060China Photonics Laboratory Division of ComputerElectricaland Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen 518060China

Ultra-intense femtosecond vortex pulses can provide an opportunity to investigate the new phenomena with orbital angular momentum(OAM)involved in extreme *** paper reports a high gain optical vortex amplifier for intense femtosecond vortex pulses *** regeneration amplifiers can offer high gain for Gaussian mode pulses but cannot amplify optical vortex pulses while maintaining the phase singularity because of mode ***,we present a regeneration amplifier with a ring-shaped *** controlling the radius of the pump,the system can realize the motivation of the Laguerre–Gaussian[LG0,1(−1)]mode and the suppression of the Gaussian *** seeds,the amplifier has a donut-shaped output containing two opposite OAM states simultaneously,as our prediction by *** seeded by a pulse of a topologic charge of 1 or−1,the system will output an amplified LG0,1(−1)mode pulse with the same topologic charge as the *** our knowledge,this amplifier can offer the highest gain as 1.45×106 for optical vortex ***,we obtain a 1.8 mJ,51 fs compressed optical vortex seeded from a 2 nJ optical vortex.

关键词： amplifier optical pump

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Generation and imaging of a tunable ultrafast intensity-rotating optical field with a cycle down to femtosecond region

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High Power Laser Science and Engineering 2020年第1期8卷 16-22页

作者： xuanke Zeng Shuiqin Zheng Yi Cai Hongyu Wang Xiaowei Lu Honggeng Wang Jingzhen Li Weixin Xie shixiang xu Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology College of Physics and Optoelectronics EngineeringShenzhen UniversityShenzhen 518060China College of Electronic and Information Engineering Shenzhen UniversityShenzhen 518060China

A tunable ultrafast intensity-rotating optical field is generated by overlapping a pair of 20Hz,800 nm chirped pulses with a Michelson interferometer(MI).Its rotating rate can be up to 10 trillion radians per second(Trad/s),which can be flexibly tuned with a mirror in the ***,its fold rotational symmetry structure is also changeable by controlling the difference from the topological charges of the pulse ***,we have successfully developed a twopetal lattice with a tunable rotating speed from 3.9 Trad/s up to 11.9 Trad/s,which is confirmed by our single-shot ultrafast frame imager based on noncollinear optical-parametric amplification with its highest frame rate of 15 trillion frames per second(Tfps).This work is carried out at a low repetition ***,it can be applied at relativistic,even ultrarelativistic,intensities,which usually operate in low repetition rate ultrashort and ultraintense laser *** believe that it may have application in laser-plasma-based accelerators,strong terahertz radiations and celestial phenomena.

关键词： noncollinear optical-parametric amplification rotating rate ultrafast frame imager ultrafast intensity-rotating optical field

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