A5011684497- Digital Holography and Microscopy
- Advanced Optical Imaging Technologies
- Advanced Fiber Laser Technologies
- Near-Field Optical Microscopy
- Perovskite Materials and Applications
- Image Processing Techniques and Applications
- Orbital Angular Momentum in Optics
- 2D Materials and Applications
- Optical measurement and interference techniques
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Random lasers and scattering media
- Optical Coherence Tomography Applications
- Multiferroics and related materials
- Photonic Crystal and Fiber Optics
- Optical Polarization and Ellipsometry
- Infrared Target Detection Methodologies
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Advanced Measurement and Detection Methods
- Optical Systems and Laser Technology
- Graphene research and applications
- Laser-Matter Interactions and Applications
- Geological and Geochemical Analysis
- Carbon and Quantum Dots Applications
Peking University
2020-2025
Institute of Physics
2020-2025
Beijing Institute of Technology
2018-2024
South China Normal University
2023
Beijing Graphene Institute
2023
Zhejiang University of Technology
2019-2023
Northwestern Polytechnical University
2015-2022
Ministry of Industry and Information Technology
2022
Center for Interdisciplinary Studies
2020
National Laboratory for Superconductivity
2020
Graphene-like two dimensional materials, such as WS2 and MoS2, are highly anisotropic layered compounds that have attracted growing interest from basic research to practical applications. Similar with few-layer has remarkable physical properties. Here, we demonstrate for the first time nanosheets exhibit ultrafast nonlinear saturable absorption property high optical damage threshold. Soliton mode-locking operations achieved separately in an erbium-doped fiber laser using types of WS2-based...
We propose the concept of perfect vectorial vortex beams (VVBs), which not merely have intensity profile independent polarization order and topological charge spiral phase, but also stable state (SoP) upon propagation. Utilizing a Sagnac interferometer, we approximately generate VVBs with locally linear elliptical polarizations, demonstrate that such can keep their SoP at certain propagation distance. These proposed be expanded to encode information quantum cryptography, as well enrich...
Rhombohedral-stacked transition-metal dichalcogenides (3R-TMDs), which are distinct from their hexagonal counterparts, exhibit higher carrier mobility, sliding ferroelectricity, and coherently enhanced nonlinear optical responses. However, surface epitaxial growth of large multilayer 3R-TMD single crystals is difficult. We report an interfacial epitaxy methodology for several compositions, including molybdenum disulfide (MoS 2 ), diselenide, tungsten disulfide, niobium sulfoselenide. Feeding...
We present a kind of harmonic mode locking bound-state solitons in fiber laser based on molybdenum disulfide (MoS(2)) saturable absorber (SA). The locker is fabricated by depositing MoS(2) nanosheets D-shaped (DF). In the laser, two form pulses with temporal separation 3.4 ps, and are equally distributed at repetition rate 125 MHz, corresponding to 14th harmonics fundamental cavity (8.968 MHz). Single- multiple-pulses emissions also observed changing pump power optimizing DF SA. Our...
Nonlinear optical crystals lie at the core of ultrafast laser science and quantum communication technology. The emergence 2D materials provides a revolutionary potential for nonlinear due to their exceptionally high coefficients. However, uncontrolled stacking orders generally induce destructive response phase deviation in different layers. Therefore, conversion efficiency is typically limited less than 0.01% (far below practical criterion >1%). Here, crystalline films rhombohedral boron...
We propose a low-threshold soliton fiber laser passively mode locked with two different types of film-like saturable absorbers, one which is fabricated by mixing Bi2Te3 de-ionized water, as well polyvinyl alcohol (PVA), and then evaporating them in Petri dish, the other prepared directly dropping solution on PVA film. Both Bi2Te3–PVA films exhibit outstanding features low loss, high flexibility, easy synthesis. By incorporating into lasers, stable single-soliton emissions are obtained at...
A dual-wavelength common-path digital holographic microscopy based on a single parallel glass plate is presented to achieve quantitative phase imaging, which combines the technique with lateral shearing interferometry. Two illumination laser beams different wavelengths (λ1=532 nm and λ2=632.8 nm) are reflected by front back surfaces of create shear form hologram, then hologram reconstructed obtain distribution synthetic wavelength Λ=3339.8 nm. The experimental configuration very compact,...
Core-shell nanostructured hollow carbon nanospheres@nickel cobalt double hydroxides (HCNs@NiCo-LDH) were fabricated using a facile hydrothermal method and investigated as high-performance electrode materials for supercapacitors. HCNs acquired by successive polymerization, carbonization etching process, which was subsequently wrapped ultrathin NiCo-LDH nanosheets. The HCNs@NiCo-LDH achieved high specific capacitance (2558 F g-1 at 1 A g-1) outstanding rate capability with 74.9% retention...
We propose a compact and easy-to-align lateral shearing common-path digital holographic microscopy, which is based on slightly trapezoid Sagnac interferometer to create two laterally sheared beams form off-axis geometry. In this interferometer, the pass through set of identical optical elements in opposite directions have nearly same path difference. Without any vibration isolation, temporal stability setup found be around 0.011 rad. Compared with highly simple angle can easily adjusted...
We demonstrate a simple method for quantitative phase imaging of tiny transparent objects such as living cells based on the transport intensity equation. The experiments are performed using an inverted bright field microscope upgraded with flipping module, which enables to simultaneously create two laterally separated images unequal defocus distances. This add-on module does not include any lenses or gratings and is cost-effective easy-to-alignment. validity this confirmed by measurement...
An abnormal electrochemical extraction of ions from the A site is observed in perovskite BiFeO<sub>3</sub>, different a conventional perovskite.
We develop a transmission and total internal reflection (TIR) integrated digital holographic microscopy (DHM) by introducing home-made Dove prism with polished short side. With the help of angular polarization multiplexing techniques, 2D refractive index distribution specimen adhered on surface is determined using TIR-DHM. Meanwhile, thickness profile unambiguously calculated from phase information DHM. This nondestructive dynamic can be used to simultaneously measure transparent or...
The spatial light modulator (SLM) is considered as an effective device to create beams with inhomogeneous phases and polarizations, such vortex vector beams. However, the nonlinear responses of SLM severely reduce generation efficiency these In this paper, by calibrating present a linear phase response in scope 0-2π, we propose convenient efficient method creating arbitrary polarizations based on encoding. Compared common methods generating beams, our approach can distinctly enhance efficiency.
Abstract Quantum dot light‐emitting diodes (QD‐LEDs) are highly promising light sources with excellent figures of merit. Although great successes have been achieved in elevating some key parameters to an ideal level, QD‐LEDs superior performance all aspects rarely realized. Herein, by exploring crystalline structure‐dependent electronic properties, it is shown that can simultaneously exhibit high external quantum efficiency, roll‐off‐free under brightness, and dramatically improved...
The nonlinear optical response in graphene is finding increasing applications nanophotonic devices. activation and enhancement of second harmonic generation (SHG) graphene, which generally forbidden monolayer AB-stacked bilayer due to their centrosymmetry, urgent need for applications. Here, we present a comprehensive study SHG performance twisted multilayer structures based on stacking engineering. It found that the modulation in-plane out-of-plane susceptibility components by few-layer...
Entangled photon-pair sources are pivotal in various quantum applications. Miniaturizing the devices to meet requirement limited space applications drives search for ultracompact entangled sources. The rise of two-dimensional (2D) semiconductors has been demonstrated as However, generation rate and purity relatively low, strong photoluminescence 2D also makes operational wavelength range limited. Here, we use spontaneous parametric down conversion (SPDC) rhombohedral boron nitride (rBN) a...
The digital optical phase conjugation (DOPC) technique is being actively developed for focusing and imaging through or inside complex media. Due to its time-reversal nature, DOPC has been exploited regenerate different intensity targets. However, whether the targets with three-dimensional information media could be recovered not experimentally demonstrated, best of our knowledge. Here, we present a method structured laser beams based on DOPC. Although only original scattered wave time...
Flower-like carbon dots/manganese dioxide (CQDs/MnO2) nanocomposites were successfully synthesized and investigated as novel electrode materials for supercapacitors. CQDs uniformly distributed on the transparent petal of δ-MnO2 a high specific surface area 168.8 m2 g−1 was achieved CQDs/MnO2 sample with 10 wt% (CQDs/MnO2-10). Furthermore, CQDs/MnO2-10 nanoflower exhibited outstanding pseudocapacitance performance, including capacitance, good rate capability (210 F at 20 A g−1), excellent...