A5025642264- Spectroscopy and Laser Applications
- Terahertz technology and applications
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Photoreceptor and optogenetics research
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Supramolecular Chemistry and Complexes
- Atmospheric Ozone and Climate
- Magnetic properties of thin films
- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Laser Design and Applications
- Natural product bioactivities and synthesis
- Optical Network Technologies
- Crystallization and Solubility Studies
- Topological Materials and Phenomena
- Supercapacitor Materials and Fabrication
- Noise Effects and Management
- bioluminescence and chemiluminescence research
- Quantum-Dot Cellular Automata
- Quantum Dots Synthesis And Properties
- Micro and Nano Robotics
- Perovskite Materials and Applications
Minzu University of China
2025
Baise University
2025
Université Paris Cité
2016-2022
Université Paris Sciences et Lettres
2019-2022
École Normale Supérieure - PSL
2017-2022
Sorbonne Université
2019-2022
Centre National de la Recherche Scientifique
2010-2022
University of Groningen
2020-2022
Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine
2022
Optica
2022
In this report, we present the research results on using conventional method and microwave technology to extract curcuminoid from turmeric roots originated in different regions of Northern Vietnam. This is simple, yet economical, non-toxic still able achieve high extraction performance get roots. The detailed Raman vibration spectra combined with X-ray powder diffraction high-performance liquid chromatography/mass spectrometry allowed evaluation each batch curcumin crystalline sample...
Spintronic structures are extensively investigated for their spin–orbit torque properties, required magnetic commutation functionalities. Current progress in these materials is dependent on the interface engineering optimization of spin transmission. Here, we advance analysis ultrafast spin-charge conversion phenomena at ferromagnetic-transition metal interfaces due to inverse spin-Hall effect properties. In particular, intrinsic Pt-based systems and extrinsic Au:W Au:Ta NiFe/Au:(W,Ta)...
An artificial molecular motor is efficiently powered with near-infrared light compatible in vivo applications.
Abstract Photoactuators and photoluminescent dyes utilize light to perform mechanical motion undergo spontaneous radiation emission, respectively. Combining these two functionalities in a single molecule would benefit the construction of advanced molecular machines. Due possible detrimental interaction between light-dependent functional parts, design hybrid systems featuring both functions parallel remains highly challenging. Here, we develop light-driven rotary motor with an efficient dye...
Molecular machines have caused one of the greatest paradigm shifts in chemistry, and by powering artificial mechanical molecular systems enabling autonomous motion, they are expected to be at heart exciting new technologies. One biggest challenges that still needs addressed is designing involved molecules combine different orthogonally controllable functions. Here, we present a prototype motors exhibiting dual function rotary motion photoluminescence. Both properties controlled light...
To clarify the frequency components of sound source newly developed locomotive and contribution each to overall noise, so as implement effective noise reduction treatment rectification measures, ensure that meets test acceptance standards. The source, distribution main are deeply analyzed by using microphone array identification algorithm. Through intensity method, different sources is accurately evaluated, based on this, a targeted scheme for locomotives proposed. In process experiment,...
In recent years, transition metal oxides (TMOs) have emerged as promising candidates for anode materials in lithium-ion batteries (LIBs) owing to their high theoretical capacities. Regrettably, most TMOs exhibit poor electronic/ionic conductivity and undergo substantial volume expansion during the lithiation/delithiation processes. this study, an electrostatic spinning method using polyacrylonitrile, graphene, iron(III) acetylacetonate precursors was employed synthesize Fe3O4@G/C composite...
Abstract The exploitation of ultrafast electron dynamics in quantum cascade lasers (QCLs) holds enormous potential for intense, compact mode-locked terahertz (THz) sources, squeezed THz light, frequency mixers, and comb-based metrology systems. Yet the important sub-cycle have been notoriously difficult to access operational QCLs. Here, we employ high-field pulses perform first two-dimensional spectroscopy a free-running QCL. Strong incoherent coherent nonlinearities up eight-wave mixing are...
Trichlorfon (TF) is one of the organophosphorus pesticides used widely in agriculture. The content this paper includes exploitation dominant optical properties quantum dots consisting a core and multilayer shell CdSe/ZnSe/ZnS (QD). A biosensor was fabricated on basis QD for rapidly detecting residues trichlofon pesticide with concentrations 0.01 ppm to 5 ppm. measurements were carried out examine morphology structure fluorescent such as transmission electron microscopy, x-ray diffraction,...
Terahertz (THz) and sub-THz frequency emitter detector technologies are receiving increasing attention, underpinned by emerging applications in ultra-fast THz physics, frequency-combs technology pulsed laser development this relatively unexplored region of the electromagnetic spectrum.In particular, semiconductorbased ultrafast receivers required for compact, spectroscopy communication systems, to date, quantum well infrared photodetectors (QWIPs) have proved be an excellent address given...
Subpicosecond optical transmission experiments are used to compare saturable absorber (SA) based on bundled single-walled carbon nanotubes (SWNT) and iron-doped InGaAs/InP epitaxial multiple quantum wells (MQW) at 1.55 μm telecom wavelength. The SA key parameters (contrast ratio, saturation fluence, recovery time) relevant for high speed all signal regeneration (AOSR) extracted from the normalized differential (NDT). Although both exhibit good contrast ratios, SWNT show a full as well much...
Multiple crossings at the domain boundary with different molecular orientations enhance exciton dissociation efficiency in single-material organic solar cells.
Harmonic modelocking of lasers is usually employed to attain high repetition rates. Despite the favourable dynamics THz quantum cascade (QCLs), harmonic active has not been demonstrated. In this work, using ultrafast time resolved spectroscopy, we present first demonstrations performed at fundamental and second on metal-metal QCL. We will also show that in certain cases, QCLs can spontaneously self-starting behaviour up 15 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Millimeter wave (mmWave) generation using photonic techniques has so far been limited to the use of near-infrared lasers that are down-converted mmWave region. However, such methodologies do not currently benefit from a monolithic architecture and suffer quantum defect. Here we show how miniaturized terahertz (THz) cascade (QCLs) can open up possibility innovatively integrating both laser action in single device. We demonstrate intracavity within THz QCLs over unprecedented range 25 GHz 500...
Dye-sensitization of a molecular motor allowed its functioning under two-photon near-infrared excitation. Ultrafast transient absorption spectroscopy was used to verify energy transfer from the sensitizer and motor’s subsequent rotation.
Narrowband THz pulses generated from a periodically poled lithium niobate crystal are used to injection seed terahertz quantum cascade laser. The phase locked spectral emission the laser is significantly influenced by spectrum of pulse.
We demonstrate the generation of short terahertz pulses from spectrally broad metal-metal quantum cascade lasers at 77 K via active mode-locking, and show limiting role phase-matching between pulse microwave modulation. Furthermore a new concept THz dispersion control is proposed to go beyond limitation current modulation scheme.
Single-walled carbon nanotubes (SWNT) based saturable absorber (SA) are investigated by two-color pump-probe experiments at 10GHz excitation repetition rate within the telecom wavelength range 1.51-1.55µm. Results show that SWNT SA exhibit a great potential for high-bit-rate optical regeneration.
In this contribution, we demonstrate ultrafast sub-wavelength (λ/10) THz QWIP detectors based on a 3D split-ring geometry recently developed in our team [3]. The key idea is to exploit miniaturized loop RF antenna as coupler element efficiently feed radiation (λ=100-200 μm) into an ultra-sub-wavelength (λ/25) active core (active volume ~20 μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3)</sup> , depicted Fig. 1(a). LC resonance of the...
In laser technology, harmonic modelocking is usually employed to attain higher repetition rates that associated with lower noise systems. Despite the favourable dynamics of THz QCLs, active has not been experimentally demonstrated yet. this work, we present results experiments performed at fundamental and second on a 6mm double metal QCL. We will also show in certain cases, QCLs can spontaneously emission without an modulation, i.e. self-starting behaviour.
Terahertz (THz) emission spectroscopy in spin systems has become a very powerful method to generate THz radiation and investigate the properties of Rashba or Topological Insulator surface states. Broadband can be generated heavy metallic more general systems. In 3d/5d transient metal bilayers is via Inverse Spin Hall effect. Beyond structures, states are strong candidates for THz-spintronics owing their high charge conversion properties. Here we present 2D Electron Gas with spin-orbit...