A5050551178- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Semiconductor materials and devices
- Advanced Measurement and Metrology Techniques
- Advanced Memory and Neural Computing
- Ferroelectric and Negative Capacitance Devices
- Silicon Carbide Semiconductor Technologies
- Photonic and Optical Devices
- Electronic and Structural Properties of Oxides
- Optical measurement and interference techniques
- Copper Interconnects and Reliability
- Crystallography and molecular interactions
- Optical Polarization and Ellipsometry
- Advanced machining processes and optimization
- Color Science and Applications
- Surface Roughness and Optical Measurements
- Optical Network Technologies
- Optical Coherence Tomography Applications
- Semiconductor Lasers and Optical Devices
- Advanced optical system design
- Advanced Surface Polishing Techniques
- Advanced Sensor Technologies Research
- Optical Coatings and Gratings
- Advanced Photonic Communication Systems
- Ferroelectric and Piezoelectric Materials
Dalian University of Technology
2021-2024
China Academy of Engineering Physics
2019-2023
University Town of Shenzhen
2019-2022
Tsinghua University
2014-2022
Tsinghua–Berkeley Shenzhen Institute
2021
Xi’an University of Posts and Telecommunications
2019
Beijing University of Posts and Telecommunications
2006
Chromatic confocal technology (CCT) is one of the most promising methods for contactless and accurate measurement structure profiles. Based on principles chromatic dispersion theory, a probe proposed optimized with several commercial cheap refractive index lenses. The provides 0.3× magnification range 400 μm LED source an effective bandwidth ca. 450-623 nm. Since noise fluctuation can affect extraction stability focal wavelength, modification to centroid peak algorithm in this paper, where...
To improve the positioning capabilities of a chromatic confocal displacement measurement system, we introduce super-resolving pupil filtering element (referred to as spatial-bandpass-filter), an X-shaped fiber-coupler, and modified peak-extraction algorithm. The spatial-bandpass-filer decreases spherical aberration conventional refractive lenses transmission loss, without changing dispersion range. new optical design minimizes effect light-source-variation well reflectance-variation sample...
Abstract In this study, three-probe error separation was developed with three chromatic confocal displacement sensors for roundness measurement. Here, the harmonic suppression is discussed first to set suitable orientation angles among sensors. Monte Carlo simulation utilized test and optimize off-axial distance. The experimental setup established using a precise rotary platform. results show that measured an orientation-angle combination of (0°, 90.1°, 178.6°) much better than another...
Y-doping can effectively improve the performance of HfOx-based resistive random-access memory (RRAM) devices, but underlying physical mechanism affecting memristors is still missing and unclear. Although impedance spectroscopy (IS) has been widely used to investigate characteristics switching mechanisms RRAM there less IS analysis on Y-doped devices as well at different temperatures. Here, effect with a Ti/HfOx/Pt structure were reported using current-voltage IS. The results indicated that...
We investigated the effect of nitrogen–hydrogen (NH) mixed plasma pretreatment 4H–SiC surfaces on SiC surface properties, SiO2/SiC interface quality, and reliability voltage stability metal–oxide–semiconductor (MOS) capacitors. The NH decreased incomplete oxide contaminants reduced density traps. Compared with untreated sample, dielectric insulating characteristics samples pretreated by were improved. also demonstrated that shift/hysteresis flat band (Vfb) midgap (Vmg) induced bias...
A hybrid strategy is proposed to meet the challenge of obtaining profile micro gear teeth with a small modulus. Firstly, contact probe segmentally obtained falling flank profiles an auxiliary lifting mechanism avoid interference when it climbs on rising slope. Then, noncontact chromatic confocal displacement sensor efficiently acquired peak positions carry out two-point error separation from measurement. Finally, actual experiments were carried obtain harmonic drive flexspline. Compared...
A novel push-pull modulator based scheme to generate W-band millimeter-wave (mm-wave) vector signal was proposed and experimentally demonstrated. Related an I/Q modulator, has the advantages of simple architecture, small insertion loss low cost. Through combining one 40 GHz upper sideband (USB) using a quadrature-phase-shift-keying (QPSK) modulation with -40 unmodulated lower (LSB), QPSK modulated 4 G-Baud 80 single mm-wave successfully generated.
As a fundamental geometric indicator, high precision roundness measurement is the basis evaluation index of cylindrical or spherical parts. In most measurements, rotation platforms are used to bring certain error result. Two-probe method typical strategy with separation technique, coming from three-probe low cost, online integration, flexible installation, etc. We developed system three chromatic confocal displacement sensors flexibility and axial-resolution. start, two sets data achieved...
The diversity of the carrier transport mechanism in resistive switching process remains a significant obstacle for design and application random access memory (RRAM) devices. In this study, influence annealing on dielectric properties Ti/HfO x /Pt RRAM device its associated is investigated. results reveal that current conduction both annealed unannealed devices primarily attributed to grain boundary (GB) relaxation, with only GB acting as depletion layer induces relaxation. Furthermore,...
Thin films are used in many areas for protecting the base, isolating electrons, and so on. Based on thin-film interference principle characteristics of Y-shaped fiber, this paper proposed a reflection objective with annular reflection. With objective, incident light from central fiber can be well received high signal-to-noise ratio. By comparing prior-known spectral reflectance standard mirror, absolute achieved. Furthermore, according to thin-film, film thickness is acquired by evolutionary...
Chromatic confocal displacement measurement is a newly developed technology for linear precision positioning with sub-micron meter accuracy over millimeter order range. In this technique, the chromatic spectrum of white light source divided by an optical dispersion system. The encoded disperses along axial direction, which position can be detected spectrometer at high precision. Thus, system that determines final required to own large capacity and small spherical aberration. A lens (CDL)...