A5029476898- Terahertz technology and applications
- 2D Materials and Applications
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Topological Materials and Phenomena
- Metamaterials and Metasurfaces Applications
- Perovskite Materials and Applications
- Advanced Fiber Laser Technologies
- Chalcogenide Semiconductor Thin Films
- Photonic Crystals and Applications
- Mechanical and Optical Resonators
- Semiconductor Quantum Structures and Devices
- Superconducting and THz Device Technology
- Advanced Semiconductor Detectors and Materials
- Carbon and Quantum Dots Applications
- Neural Networks and Applications
- Advanced Thermoelectric Materials and Devices
- Molecular Sensors and Ion Detection
- Advanced biosensing and bioanalysis techniques
- Graphene research and applications
- Luminescence and Fluorescent Materials
- Diamond and Carbon-based Materials Research
- Orbital Angular Momentum in Optics
- Animal Virus Infections Studies
- Spectroscopy and Quantum Chemical Studies
Northwest University
2016-2025
Nantong University
2023-2025
Chengdu Medical College
2024
Henan Polytechnic University
2024
Chengdu Women's and Children's Central Hospital
2024
University of Electronic Science and Technology of China
2024
Ministry of Agriculture and Rural Affairs
2024
Nanjing Agricultural University
2024
Jiangsu Academy of Agricultural Sciences
2024
First Affiliated Hospital of Chengdu Medical College
2024
Nonlinear optics has undergone dramatic developments in the past 60 years, which revolutionized photonic and optoelectronic fields with many essential applications such as electro-optic switching, frequency mixing, optical parametric oscillation, phase conjugation, so forth. As one of new promising candidates for both next-generation photovoltaic devices, halide perovskite semiconductors have attracted extensive research attention because their excellent electrical properties demonstrated...
Surface optical rectification was observed from the layered semiconductor molybdenum disulfide (MoS2) crystal via terahertz (THz) time-domain surface emission spectroscopy under linearly polarized femtosecond laser excitation. The radiated THz amplitude of MoS2 has a linear dependence on ever-increasing pump fluence and thus quadratic with electric field, which discriminates Dember field induced radiation in InAs transient photocurrent-induced generation graphite. Theoretical analysis based...
Surfaces and interfaces are of particular importance for optoelectronic photonic materials as they involved in many physical chemical processes such carrier dynamics, charge transfer, bonding, transformation reactions so on. Terahertz (THz) emission spectroscopy provides a sensitive nondestructive method surface or interface analysis advanced ranging from graphene to transition metal dichalcogenides, topological insulators, hybrid perovskites, mixed-dimensional heterostructures based on 2D...
Abstract Broadband light sources emitting in the terahertz spectral range are highly desired for applications such as noninvasive imaging and spectroscopy. Conventionally, THz pulses generated by optical rectification bulk nonlinear crystals with millimetre thickness, bandwidth limited phase-matching condition. Here we demonstrate broadband emission via surface from a simple, commercially available 19 nm-thick indium tin oxide (ITO) thin film. We show an enhancement of signal when pump laser...
Large-scale multi-heterostructure and optimal band alignment are significantly challenging but vital for photoelectrochemical (PEC)-type photodetector water splitting. Herein, the centimeter-scale bismuth chalcogenides-based cascade heterostructure is successfully synthesized by a sequential vapor phase deposition method. The multi-staggered of Bi2 Te3 /Bi2 Se3 S3 optimized verified X-ray photoelectron spectroscopy. PEC photodetectors based on these heterostructures demonstrate highest...
Abstract Diamond is emerging as an attractive third‐generation wide‐bandgap semiconductor for future on‐chip nonlinear photonics and quantum optics due to its unique thermal, optical, mechanical properties. However, the light‐driven current under below‐band gap excitation from second‐order optical effect in diamond still challenging. Herein, a giant photocurrent observed chemical vapor deposition (CVD) by utilizing terahertz (THz) emission spectroscopy. This ultrafast originates photon drag...
A ten times enhancement of THz emission from VGG compared with single layer graphene under the same conditions.
Terahertz (THz) radiation of layered molybdenum disulfide (MoS2) crystal under femtosecond laser irradiation was observed using THz surface emission spectroscopy variable-angle transmission configuration. Although MoS2 demonstrates inversion symmetry, surface-symmetry breaking will introduce the resonant optical rectification, which is consistent with incident polarization and azimuthal angle dependences from MoS2. However, depletion field induced make an important contribution oblique...
Terahertz (THz) time-domain emission spectroscopy in both transmission and reflection configurations has been employed to understand the THz radiation property surface properties of tungsten disulfide ($\mathrm{W}{\mathrm{S}}_{2}$). We observed only one polarization under different pump beam a saturation effect with increasing power. The results are from that $\mathrm{Mo}{\mathrm{S}}_{2}$ based on optical rectification spite similar physical optoelectronic them. nonlinear coefficient...
Abstract Band alignment is a key issue for the optoelectronics based on 2D layered transition metal dichalcogenides (TMDs) heterostructures. Herein, band of MoTe 2 /MoS mixed heterostructure measured with high‐resolution X‐ray photoelectron spectroscopy. The belongs to type‐II conduction offset 0.46 eV and valence 0.9 eV. stronger saturable absorption observed in film compared that pure MoS nanofilms at same condition. An energy‐level model combined Runge–Kutta algorithm used understand...
Abstract The dynamics of photoexcited species is quite important for the development next‐generation ultrafast optoelectronic devices based on transition metal dichalcogenides (TMDs). Herein, time‐resolved optical pump terahertz (THz) probe spectroscopy, which sensitive to both bounded excitons and free electrons/holes, employed study photo‐induced carriers in typical layered TMDs crystal tungsten diselenide (WSe 2 ). Initial photoexcitation could generate excitons. decay followed by...
Strain engineering is an attractive method to induce and control anisotropy for polarized optoelectronic applications with two-dimensional (2D) materials. Herein, we have investigated the nonlinear optical coefficient dispersion relationship second-harmonic generation (SHG) pattern evolution under uniaxial strains graphene, WS2, GaSe, In2Se3 monolayers. The strain can break in-plane symmetry of 2D materials, leading both trade-off breaking new emergent coefficients. In such a case, classical...
The surface-charge region of bulk and monolayer MoSe2 is analyzed directly by terahertz (THz) surface emission spectroscopy in a nondestructive way. Both nonlinear optical polarization field-induced photocurrent contribute to the THz radiation both MoSe2. first mechanism due rectification second one photogenerated carriers accelerated depletion field. contribution from basically same for because symmetry at surface. However, ∼94.2% it goes down 74.5% This larger field (∼2.54 × 107 V/m)...
Light-frequency conversion based on two-dimensional (2D) materials is of great importance for modern nano- and integrated photonics. Herein, we report both the intrinsic (from pure WX2 (X = S, Se, Te)) extrinsic interface graphene/WX2) second-order nonlinear coefficient tensor from graphene/WX2 van der Waals (vdW) heterostructures by first-principles calculations. The prominent peaks in dispersion relation monolayer are due to Van Hove singularity high-symmetry point or along line with high...
Abstract Recent advances in the development of polarized terahertz (THz) emission from nanomaterials have not only opened up a new “TeraNano” interdiscipline but also provided tool for nonlinear optical process research. Herein, THz radiation mechanism monolayer tungsten disulfide (WS 2 ) is first investigated by both linear and circular polarization laser excitations at room temperature. The results reveal that dominated rectification based on in‐plane dipoles, which totally different bulk...
Abstract High‐order nonlinear optical phenomena are interesting from a fundamental point of view as they reveal intrinsic symmetries the materials. Potentially can also be used for practical optoelectronic applications. shift current is one these phenomena, and yet it has never been detected in experiments, primarily due to difficulty conventional contact detection. In this work, two‐photon absorption (TPA) all‐inorganic perovskite CsPbBr 3 first observed by contactless nondestructive...
To address the adaptability and insufficient imaging quality of conventional in-pipe techniques for irregular pipelines or unstructured scenes, this study proposes a novel radial rotating full-depth-of-field focusing system designed to adapt structural complexities pipelines, which can effectively acquire tiny details with depth 300–960 mm inside pipeline. Firstly, fast method driven by features is proposed. Secondly, full-depth apparatus developed, incorporating zoom camera, miniature servo...
Abstract The nonlinear photon drag current offers a promising platform for fundamental understanding of optical physics and application modern optoelectronic devices. However, the fine differentiation both first‐order second‐order from other photocurrents is in challenge calls universal method experimental design. Herein, wavelength‐tunable terahertz (THz) emission spectroscopy as an all‐optical proposed to probe ultrafast vertically grown GaS with high coefficients. Based on rich THz...