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O-FIB:far-field-induced near-field breakdown for direct nanowriting in an atmospheric environment

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Light(Science & Applications) 2020年第1期9卷 1624-1630页

作者： Zhen-Ze Li Lei Wang Hua Fan Yan-Hao Yu Qi-Dai Chen Saulius Juodkazis Hong-Bo Sun State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Nanotechnology facility Swinburne University of TechnologyJohn St.Hawthorn 3122 VicAustralia State Key Laboratory of Precision Measurement Technology and instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China

Nanoscale surface texturing,drilling,cutting,and spatial sculpturing,which are essential for applications,including thin-film solar cells,photonic chips,antireflection,wettability,and friction drag reduction,require not only high accuracy in material processing,but also the capability of manufacturing in an atmospheric *** used focused ion beam(FIB)technology offers nanoscale precision,but is limited by the vacuum-working conditions;therefore,it is not applicable to industrial-scale samples such as ship hulls or biomaterials,e.g.,cells and ***,we report an optical far-field-induced near-field breakdown(O-FIB)approach as an optical version of the conventional FIB technique,which allows direct nanowriting in *** writing is initiated from nanoholes created by femtosecondlaser-induced multiphoton absorption,and its cutting“knife edge”is sharpened by the far-field-regulated enhancement of the optical near field.A spatial resolution of less than 20 nm(λ/40,withλbeing the light wavelength)is readily achieved.O-FIB is empowered by the utilization of simple polarization control of the incident light to steer the nanogroove writing along the designed *** universality of near-field enhancement and localization makes O-FIB applicable to various materials,and enables a large-area printing mode that is superior to conventional FIB processing.

关键词： field printing friction

Fast X-ray imaging beamline at SSRF

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Nuclear Science and Techniques 2024年第9期35卷 68-81页

作者： Ke Li Hong-Lan Xie Ya-Nan Fu Fei-Xiang Wang Guo-Hao Du Jian-Feng ji Biao Deng Ti-Qiao Xiao Shanghai Synchrotron Radiation facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

The fast X-ray imaging beamline(BL16U2)at Shanghai Synchrotron Radiation facility(SSRF)is a new beamline that provides X-ray micro-imaging capabilities across a wide range of time scales,spanning from 100 ps toμs and *** beamline has been specifically designed to facilitate the investigation of a wide range of rapid phenomena,such as the deformation and failure of materials subjected to intense dynamic *** addition,it enables the study of high-pressure and high-speed fuel spray processes in automotive *** light source of this beamline is a cryogenic permanent magnet undulator(CPMU)that is cooled by liquid *** CPMU can generate X-ray photons within an energy range of 8.7-30 *** beamline offers two modes of operation:monochromatic beam mode with a liquid nitrogen-cooled double-crystal monochromator(DCM)and pink beam mode with the first crystal of the DCM out of the beam *** X-ray imaging methods were implemented in BL16U2:single-pulse ultrafast X-ray imaging,microsecond-resolved X-ray dynamic imaging,millisecond-resolved X-ray dynamic micro-CT,and high-resolution quantitative ***,BL16U2 is equipped with various in situ impact loading systems,such as a split Hopkinson bar system,light gas gun,and fuel spray *** the completion of the final commissioning in 2021 and subsequent trial operations in 2022,the beamline has been officially available to users from 2023.

关键词： Multiple time-scale X ray imaging Single-pulse X ray imaging Dynamic 2D imaging Dynamic micro-CT

Ozone-induced dissociation implemented with a dual-trap mass spectrometer for lipid analysis

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Ozone-induced dissociation implemented with a dual-trap mass...

Electron paramagnetic resonance characterization of aluminum ion implantation-induced defects in 4H-SiC

2018年中国质谱学术大会（CMSC2018）

作者： Xinwei Liu Xiaoxiao Ma Stephen J.Blanksby Xia Yu Zheng Ouyang State Key Laboratory of Precision Measurement Technology and instruments Department of Precision InstrumentTsinghua Universityand Department of Chemistry central Analytical Research facility Queensland University of Technology

With discontinuous atmospheric pressure interface(DAPI), lipids in biological samples can now be readily sampled, ionized, and analyzed using miniature systems with ambient ionization methods. Recently, dual-trap analyzer system was developed for Mini β instrument to enable versatile scan functions, including beam-type CID that was a unique addition to a trap instrument. Real time pressure control with gas leaking was implemented to facilitate the ion transfer as well as the coupling of gas-phase reactions for lipid analysis. Ozone-induced dissociation(OzID) was implemented with high efficiency for lipid structure analysis or confirmation. A modified Mini β instrument was used for this experiment, with a DAPI for ion introduction, two linear ion traps(LITs) installed for MS analysis and a nanoESI for ionization. Lipid ions were trapped in LIT I, and sequentially, mass-selectively transferred to LIT II for MS/MS analysis. An ozone generator was built using dielectric barrier discharge system. A pulse valve was used to introduce ozone into LIT II for reaction with lipid ions trapped. The OzID efficiency was observed to be high when the manifold pressure was higher than 5 m Torr. Phosphatidylcholines(PCs) and fatty acids(FAs) were used to test the performance of the OzID effectiveness. As a demonstration, sodiated FA 18:2(10 E, 12 Z)(m/z 325) was mass-selectively transferred from LIT I to LIT II with minimum kinetic energy, while the pulse valve connected to the ozone generator was opened for 10 ms. Fragment ions characteristic to OzID at m/z 231, 257, and 271,· due to cleavage at each C=C location, were clearly observed and the OzID efficiency was estimated to be higher than 50%. Ozone reaction with sodiated PC(16:0/18:1(9 Z))(m/z 782) also produced characteristic OzID fragments at m/z 672 and 688, with about an OzID efficiency of 10% for 100 ms ozone injection. OzID was utilized to resolve the structure of a unique fragment ion(m/z 419) discovered from CID of bicarbo

关键词： OzID lipid analysis lipid C=C location isomers miniature mass spectrometer ion trap

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Nanotechnology and Precision Engineering 2019年第4期2卷 157-162页

作者： Xiuhong Wang Zongwei Xua Mathias Rommel Bing Dong Le Song Clarence Augustine TH Tee Fengzhou Fang State Key Laboratory of Precision Measuring Technology&instruments Tianjin UniversityTianjin 300072China Fraunhofer Institute for Integrated Systems and Device Technology(IISB) Schottkystrasse 10Erlangen 91058Germany Department of Electrical Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia Centre of Advanced Research Enabler facility Faculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia

Deep-level defects in silicon carbide(SiC)are critical to the control of the performance of SiC electron *** this paper,deep-level defects in aluminumion-implanted 4H-SiC after high-temperature annealingwere studied using electron paramagnetic resonance(EPR)spectroscopy at temperatures of 77 K and 123 K under different illumination *** showed that the main defect in aluminum ion-implanted 4H-SiC was the positively charged carbon vacancy(VC+),and the higher the doping concentration was,the higher was the concentration of VC+.Itwas found that the type of material defectwas independent of the doping concentration,although more VC+defects were detected during photoexcitation and at lower *** results should be helpful in the fundamental research of p-type 4H-SiC fabrication in accordance with functional device development.

关键词： Electron paramagnetic resonance Silicon carbide Defects Carbon vacancy

The new X-ray imaging and biomedical application beamline BL13HB at SSRF

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Nuclear Science and Techniques 2023年第12期34卷 190-205页

作者： Jian‑Feng Ji Han Guo Yan‑Ling Xue Rong‑Chang Chen Ya‑Nan Fu Guo‑Hao Du Biao Deng Hong‑Lan Xie Ti‑Qiao Xiao Shanghai Synchrotron Radiation facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Shanghai Institute of Applied Physics China Academy of ScienceShanghai 201800China

A new X-ray imaging and biomedical application beamline(BL13HB)has been implemented at the Shanghai Radiation Synchrotron facility(SSRF)as an upgrade to the old X-ray imaging and biomedical application beamline(BL13W1).This is part of the Phase II construction project of the *** BL13HB is dedicated to 2D and 3D static and dynamic X-ray imaging,with a field of view of up to 48.5 mm×5.2 mm and spatial resolution as high as 0.8μm.A super-bending magnet is used as the X-ray source in BL13HB,which has a maximum magnetic field of 2.293 *** energy range of monochromatic X-ray photons from a double-multiplayer monochromator was 8–40 keV,and the white beam mode was provided on the beamline for dynamic X-ray imaging and dynamic X-ray *** maintaining the previous experimental setup of BL13W1,new equipment was added to the beamline experimental *** beamline is equipped with different sets of X-ray imaging detectors for several experimental methods such as micro-CT,dynamic micro-CT,and pair distribution *** experimental station of BL13HB is designed specifically for various in situ dynamic experiments,and BL13HB has been open to users since June 2021.

关键词： X-ray imaging Dynamic micro-CT Shanghai Synchrotron Radiation facility

The property research of the transmission sinusoidal grating with fabrication of LIGA process

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Optoelectronics Letters 2019年第5期15卷 335-338页

作者： WANG Yu-ting WANG Bo Yl Fu-ting ZHANG Tian-chong LIU Jing LIANG Xiao-xiao Beijing Synchrotron Radiation facility Institute of High Energy Physics Beijing 100049 China University of Chinese Academy of Sciences Beijing 100049 China

The transmission sinusoidal grating(TSG) shows a different diffraction pattern with conventional black-white transmission grating(BWTG), which can focus the diffraction energy on a higher order and has been widely used in the spectrum instruments. According to the description of the scalar diffraction theory, the numerical simulation for diffraction properties of the TSG has been studied for years. However, the fabrication of the TSG is difficult and seldom reported. In this article, a TSG is designed and an approach of the X-ray LIGA process is used to fabricate the TSG and the device can obtain the brightest diffraction peaks at the ±1 order with the zero-order diffraction peak unobvious on the background for a certain wavelength of the incident light.

关键词： property research transmission sinusoidal grating LIGA

Estimation of chlorophyll content in pepper leaves using spectral transmittance red-edge parameters

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International Journal of Agricultural and Biological Engineering 2022年第5期15卷 85-90页

作者： Shuai Huang You Wu Qinglan Wang Jingli Liu Qingyan Han Jianfeng Wang Jilin Academy of Agricultural Sciences Changchun 130033China Jilin Academy of Vegetable and Flower Sciences Key Laboratory of Facility Vegetable of Jilin ProvinceChangchun 130119China

The objective of this work was to monitor the growth status of pepper and provide precise guidance on fertilization through non-destructive detection methods for chlorophyll content based on spectral *** analysis of the narrower red-edge spectral region(680-760 nm)reduced the requirements for light sources and light detection sensors,and provided a simpler and more accurate method of data acquisition for the process of developing instruments for estimating chlorophyll content in *** red-edge region of spectral transmittance was demonstrated to be closely related to chlorophyll *** models for estimating chlorophyll content with seven different methods were developed using the four red-edge parameters extracted from the red-edge *** problems of multicollinearity of red-edge parameters and errors in model coefficients were solved by the ridge regression method in the process of building a multivariate regression *** results indicated that the ridge regression method reduces the errors of the model coefficients and constant terms while improving the detection accuracy,thus the ridge regression model could estimate the leaf chlorophyll content more accurately and repeatedly.

关键词： pepper leaf chlorophyll content red-edge parameters ridge regression

Methodology development and application of X-ray imaging beamline at SSRF

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Nuclear Science and Techniques 2020年第10期31卷 74-94页

作者： Hong-Lan Xie Biao Deng Guo-Hao Du Ya-Nan Fu Han Guo Yan-Ling Xue Guan-Yun Peng Fen Tao Ling Zhang Ti-Qiao Xiao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Shanghai Synchrotron Radiation facility(SSRF) Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

This paper introduces some latest developments regarding the X-ray imaging methodology and applications of the X-ray imaging and biomedical application beamline(BL13W1)at Shanghai Synchrotron Radiation facility in the past 5 *** photon energy range of the beamline is 8–72.5 *** sets of X-ray imaging detectors with different pixel sizes(0.19–24 lm)are used to realize X-ray microcomputed tomography(X-ray micro-CT)and X-ray in-line phase-contrast *** satisfy the requirements of user experiments,new X-ray imaging methods and image processing techniques are *** vivo dynamic micro-CT experiments with living insects are performed in 0.5 s(sampling rate of 2 Hz,2 tomograms/s)with a monochromatic beam from a wiggler source and in 40 ms(sampling rate of 25 Hz,25 tomograms/s)with a white beam from a bending magnet source.A new X-ray imaging method known as move contrast X-ray imaging is proposed,with which blood flow and moving tissues in raw images can be distinguished according to their moving frequencies in the time ***,X-ray speckle-tracking imaging with twice exposures to eliminate the edge enhancement effect is developed.A high-precision quantification method is realized to measure complex three-dimensional blood vessels obtained via X-ray micro-CT.X-ray imaging methods such as three-dimensional X-ray diffraction microscopy,small-angle X-ray scattering CT,and X-ray fluorescence CT are developed,in which the X-ray micro-CT imaging method is combined with other contrast mechanisms such as diffraction,scattering,and fluorescence contrasts ***,an X-ray nano-CT experiment is performed with a 100 nm spatial *** user experimental results from the fields of material science,biomedicine,paleontology,physics,chemistry,and environmental science obtained on the beamline are provided.

关键词： X-ray imaging X-ray in-line phase-contrast imaging X-ray micro-CT Dynamic micro-CT X-ray speckle-tracking imaging 3DXRD SAXS-CT X-ray fluorescence CT X-ray nano-CT Move contrast X-ray imaging

Robust generation of frequency combs in a microresonator with strong and narrowband loss

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Photonics Research 2017年第6期5卷 77-81页

作者： JING WANG ZHAOHONG HAN YUHAO GUO LIONEL C.KIMERLING JURGEN MICHEL ANURADHA M.AGARWAL GUIFANG LI LIN ZHANG Key Laboratory of Opto-Electronic Information Technology of Ministry of Education School of Precision Instruments and Opto-Electronics Engineering Tianjin University Key Laboratory of Integrated Opto-Electronic Technologies and Devices in Tianjin School of Precision Instruments and Opto-Electronics Engineering Tianjin University Department of Materials Science and Engineering Massachusetts Institute of Technology College of Optics and Photonics CREOL and FPCE University of Central Florida

Octave-spanning frequency comb generation in microresonators is promising, but strong spectral losses caused by material absorption and mode coupling between two polarizations or mode families can be detrimental. We examine the impact of the spectral loss and propose robust comb generation with a loss of even 300 dB/*** nonlinear dynamics show that a phase change associated with spectral losses can facilitate phase matching and Kerr comb generation. Given this unique capability, we propose a novel architecture of on-chip spectroscopy systems.

关键词： Robust generation of frequency combs in a microresonator with strong and narrowband loss THz