A5015526027- Advanced Optical Sensing Technologies
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Photocathodes and Microchannel Plates
- Advanced Electron Microscopy Techniques and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Electron and X-Ray Spectroscopy Techniques
- Dark Matter and Cosmic Phenomena
- Spectroscopy and Quantum Chemical Studies
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Digital Holography and Microscopy
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Ion-surface interactions and analysis
- Graphene research and applications
- Ocular and Laser Science Research
- Particle Detector Development and Performance
- Semiconductor materials and devices
- Superconducting Materials and Applications
- Photonic and Optical Devices
- Advanced X-ray Imaging Techniques
- Terahertz technology and applications
- Radiation Therapy and Dosimetry
- Optical Coherence Tomography Applications
University of Arizona
2021-2024
Gold Skin Care Center
2022
The Ohio State University
2022
Xi'an Institute of Optics and Precision Mechanics
2016-2020
Chinese Academy of Sciences
2003-2020
University of Chinese Academy of Sciences
2016-2020
Sichuan University
2020
Argonne National Laboratory
2019
Shanxi University
2018
Xi'an Jiaotong University
2017
Modern electronics are founded on switching the electrical signal by radio frequency electromagnetic fields nanosecond time scale, limiting information processing to gigahertz speed. Recently, optical switches have been demonstrated using terahertz and ultrafast laser pulses control enhance speed picosecond a few hundred femtoseconds scale. Here, we exploit reflectivity modulation of fused silica dielectric system in strong light field demonstrate (ON/OFF) with attosecond resolution....
Advances in attosecond spectroscopy have enabled tracing and controlling the electron motion dynamics matter, although they yielded insufficient information about dynamic space domain. Hence, ultrafast x-ray imaging tools been developed to image of matter real time space. The cutting-edge temporal resolution these is on order a few tens hundred femtoseconds, limiting atomic leaving out reach. Here, we obtained transmission microscope, which coined "attomicroscopy." We demonstrated this by...
The advancement of the ultrafast pulse shaping and waveform synthesis allowed to coherently control atomic electronic motions in matter. temporal resolution is inversely proportional broadening its spectrum. Here, we demonstrate light field high-power waveforms spanning two optical octaves, from near-infrared deep-ultraviolet with attosecond resolution. Moreover, utilized all-optical sampling metrology for on-demand tailoring electron motion demonstrated pave way switching photo-induced...
Over the past few decades, following first demonstration of ultrafast electron microscopy, numerous research groups have focused on achieving attosecond temporal resolution in microscopy with goal imaging and atomic motion. Recently, several studies claimed to achieve imaging(1-3). These claims are based generation pulse trains. However, typical time-resolved measurements used capture dynamic processes real-time, is determined by envelope train. The reliance using trains fails account for...
Tracing the reflectivity modulation of a dielectric system in strong field provides access to electronic delay response system.
Microchannel plates (MCPs) are widely used as electron, ion, and X-ray detectors. The gain factor time resolution of the MCP strongly dependent on its operating geometry parameters (applied voltage, length-to-diameter ratio, bias angle, electrode penetration depth). Measurements about this dependence sparse do not cover full range parameters. In paper, 3-D single channel models developed in computer simulation technology studio suit to systematically comprehensively calculate for various...
The streak tubes with a large effective photocathode area, phosphor screen and high radiant sensitivity are essential for improving the field of view, depth field, detectable range multiple-slit tube imaging lidar. In this paper, spatial resolution, compact meshless spherically curved cathode is designed tested. Its resolution reaches 20 lp/mm over entire Φ28 mm working simulated physical temporal better than 30 ps. distortion in our large-format tube, which shown to be non-negligible...
Due to the absence of matching carbon atoms at honeycomb centers with in adjacent graphene sheets, theorists predicted that a sliding process is needed form AA, AB, or ABC stacking when directly converting graphite into sp3 bonded diamond. Here, using twisted bilayer graphene, which naturally provides AA and AB configurations, we report ultrafast formation transient 2D diamond-like structure (which not observed aligned graphene) under femtosecond laser irradiation. This photo-induced phase...
Scannerless (flash) lidar system based on streak camera is able to realize three-dimensional (3D) multi-spectral fluorescence imaging and 3D polarimetry. Compared with conventional system, the flash overcomes image distortions caused by motion between target sensor platform. Other advantages of are higher update rates potential for creating a miniaturized system. To meet requirements developing this new technology, super small-sized, large photocathode area meshless tube spherical cathode...
Streak cameras applied to inertial confinement fusion research and flashless imaging lidar require large working areas. However, the larger area, bigger temporal distortion is. And has a great influence on detecting precision of streak camera, resulting in an image screen. Yet previous camera design work emphasized shorter time resolution higher special with paying less attention extent. Key factors that may affect are thoroughly analyzed this paper. We calculate electric field small-size...
a small-size streak tube with electrostatic focusing lens is designed the aid of three-dimensional electromagnetic simulation software, cst. distances between electrodes and their voltages are determined by orthogonal experiments. also, according to aberration theory tube, its imaging qualities analyzed evaluated systematically. optimal possesses predominant performances. diameter work area photocathode larger than 28 mm; physical temporal resolution better 30 ps; static spatial at margin...
Attosecond science has leveraged the highly nonlinear interactions between intense few-cycle laser pulses and matter, allowing for unprecedented observation control of electron motion with remarkable temporal resolution. However, most existing experiments focusing on laser-controlled attosecond dynamics have dealt quasi-bound electrons released in ionization continua atoms, molecules, or conduction bands solid-state systems. Here, we employed recently developed attomicroscopy imaging tool to...
Streak tube imaging lidar, as a novel flash due to its advantages of higher resolution for low contrast conditions, compact and rugged physical configurations, small image distortions owing scannerless design, update rates, has immense potential provide 3D single-laser-pulse imaging, multispectral fluorescence polarimetry. In order further reduce the size enlarge field view (FOV) lidar system, we designed super small-size, large photocathode area meshless streak with spherical cathode...
A small size and long slit streak tube with high spatial resolution was designed optimized. Curved photocathode screen were adopted to increase the working area resolution. High physical temporal obtained by using a accelerating electrode. Deflection sensitivity of improved adopting two-folded deflection plates. The simulations indicate that effective can reach 30mm × 5mm. static is higher than 40lp/mm 12lp/mm along scanning directions respectively while 60ps. magnification 0.75 0.77 in...
Abstract Modern electronics are founded on switching the electric signal by radio frequency (RF) electromagnetic fields nanosecond timescale, limiting information processing to gigahertz speed. Recently, optical switches have been demonstrated using terahertz and ultrafast laser pulses control enhance speed picosecond a few hundred femtoseconds time scale1-13. Here, we exploit reflectivity modulation of dielectric system in strong light field demonstrate (ON/OFF) with attosecond resolution....
This paper proposed a multiple-mode animal behavior analysis system integrating wireless bio-potential recorder and two 120fps video streams. A 16-channel analog-front-end (AFE) featuring chopper low noise amplifier (LNA) 12-bit successive approximation analog-to-digital converter (SAR ADC) is designed as the sensor interface. Bluetooth Low Energy (BLE) based in-the-air protocol implemented for data transmission. precise synchronization method millisecond level accuracy between frames...
Owing to the characteristics of high frame frequency, large field view, small size, streak tube with work area and size has been essential component imaging lidar, immense potential in aerospace, space exploration underwater detection. In this paper, a spherically curved photocathode modeled simulated. The static temporal resolution reaches 633fs when effective working diameter is 28mm, its magnification image 1.4. quantitative relationship between curvature radius distortion analyzed, can...
Microscopic dynamic process of material structure which determines the inherent property substance takes place on a molecular and atomic scale. Understanding underlying mechanisms various fundamental processes has always been goal chemistry, physics, biology materials science. With Ahmed Zewail's pioneering work in field femtoscience, time-resolved electron diffraction, combining pump-probe diffraction technique, become an excellent tool with sufficient temporal precision to directly deliver...