A5058174882- Quantum and electron transport phenomena
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Graphene research and applications
- Topological Materials and Phenomena
- Mechanical and Optical Resonators
- Quantum Information and Cryptography
- Plasmonic and Surface Plasmon Research
- Semiconductor Quantum Structures and Devices
- Metamaterials and Metasurfaces Applications
- Laser-Matter Interactions and Applications
- Photonic Crystals and Applications
- Perovskite Materials and Applications
- 2D Materials and Applications
- Quantum optics and atomic interactions
- Magnetic properties of thin films
- Orbital Angular Momentum in Optics
- Laser Material Processing Techniques
- Nonlinear Optical Materials Studies
- Photorefractive and Nonlinear Optics
- Chalcogenide Semiconductor Thin Films
- Optical Coatings and Gratings
- Semiconductor materials and devices
- Advanced Chemical Physics Studies
- Advanced Semiconductor Detectors and Materials
Chinese Academy of Sciences
2005-2025
Changchun Institute of Optics, Fine Mechanics and Physics
2018-2025
University of Chinese Academy of Sciences
2018-2025
Shanghai Micro Electronics Equipment (China)
2024
Vrije Universiteit Brussel
2014-2017
University of Toronto
2011-2016
Hefei National Center for Physical Sciences at Nanoscale
2007-2011
University of Science and Technology of China
2007-2011
Shanghai Institute of Optics and Fine Mechanics
2005
We perform a perturbative calculation of the third order optical conductivities doped graphene, using approximations valid around Dirac points and neglecting effects due to scattering electron–electron interactions. In this limit analytic formulas can be constructed for conductivities. discuss in detail results harmonic generation, Kerr effect two-photon carrier injection, parametric frequency conversion, two-color coherent current injection. find complicated dependence on chemical potential...
We investigate the effect of phenomenological relaxation parameters on third order optical nonlinearity doped graphene by perturbatively solving semiconductor Bloch equation around Dirac points. An analytic expression for nonlinear conductivity at zero temperature is obtained under linear dispersion approximation. With this formula as starting point, we construct finite and study response to a laser pulse duration. illustrate dependence several effects, such harmonic generation, Kerr effects...
Abstract Graphene is considered a record-performance nonlinear-optical material on the basis of numerous experiments. The observed strong nonlinear response ascribed to refractive part graphene’s electronic third-order susceptibility χ (3) cannot, however, be explained using relatively modest value theoretically predicted for 2D material. Here we solve this long-standing paradox and demonstrate that, rather than -based refraction, complex phenomenon which call saturable photoexcited-carrier...
The optical Kerr effect is the variation of a material's refractive index in response to high-intensity light, and as such causes spectrum light change. authors measure spectral broadening chirped laser pulses graphene-covered silicon waveguides, determine sign graphene's be $n\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}g\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}v\phantom{\rule{0}{0ex}}e$, contrary common assumption. This finding...
For centrosymmetric materials such as monolayer graphene, no optical second-harmonic generation (SHG) is generally expected, because it forbidden under the electric-dipole approximation. Yet we observe a strong, doping-induced SHG from with its highest strength comparable to electric-dipole-allowed in noncentrosymmetric 2D materials. This novel has nature of an electric-quadrupole response, arising effective breaking inversion symmetry by dressing in-plane photon wave vector. More...
Abstract Nonlinear optical activities, especially second harmonic generation (SHG), are key phenomena in inversion-symmetry-broken two-dimensional (2D) transition metal dichalcogenides (TMDCs). On the other hand, anisotropic nonlinear processes important for unique applications nano-nonlinear photonic devices with polarization functions, having become one of focused research topics field photonics. However, strong nonlinearity and anisotropy do not exist simultaneously common 2D materials....
Organolead trihalide perovskites have attracted significant attention for optoelectronic applications due to their excellent physical properties in the past decade. Generally, both grain boundaries perovskite films and device structure play key roles determining performance, especially horizontal-structured device. Here, first optimized vertical-structured photodetector with single crystal MAPbBr3 as light absorber graphene transport layer is shown. The hybrid combines strong photoabsorption...
The thermoelectric effects of topological semimetals have attracted tremendous research interest because many are excellent materials and thermoelectricity serves as one their most important potential applications. In this work, we reveal the transient photothermoelectric response Dirac semimetallic Cd3As2, namely photo-Seebeck effect photo-Nernst effect, by studying terahertz (THz) emission from photocurrent induced these effects. Our excitation polarization power dependence confirm that...
Elemental tellurium, conventionally recognized as a narrow bandgap semiconductor, has recently aroused research interests for exploiting Weyl physics. Chirality is unique feature of cones and can support helicity-dependent photocurrent generation, known circular photogalvanic effect. Here, we report effect with opposite signs at two different mid-infrared wavelengths which provides evidence Weyl-related optical responses. These correspond to critical transitions relating the bands sign...
Single-crystalline hybrid perovskites have important photoelectronic properties for advanced semiconductor devices, such as solar cells and photodetectors. However, neither the surface-enhanced Raman scattering (SERS) property nor correlation between SERS single-crystalline ever been studied. Here, first time, we observed a 105 enhancement in 4-mercaptopyridine (MPY) adsorbed on methylamine lead chlorine (MAPbCl3) single crystal. Compared to spectrum of bulk MPY molecules, b2 mode molecule...
Abstract We present a practical scheme to separate the contributions of electric quadrupole-like and magnetic dipole-like effects forbidden second order optical nonlinear response graphene, give analytic expressions for conductivities, calculated from independent particle approximation, with relaxation described in phenomenological way. predict strong effects, including harmonic generation, photon drag, difference frequency generation. discuss detail controllability these by tuning chemical...
We perform a full microscopic investigation on the spin relaxation in $n$-type (001) GaAs quantum wells with an ${\mathrm{Al}}_{0.4}{\mathrm{Ga}}_{0.6}\mathrm{As}$ barrier due to D'yakonov-Perel' mechanism from nearly $20\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ room temperature by constructing and numerically solving kinetic Bloch equations. consider all relevant scattering such as electron-acoustic-phonon, electron-longitudinal-optical-phonon, electron-nonmagnetic-impurity, electron-electron...
Numerically solving the semiconductor Bloch equations within a phenomenological relaxation time approximation, we extract both linear and nonlinear optical conductivities of doped graphene gapped under excitation by laser pulse. We discuss in detail dependence second harmonic generation, third Kerr effects on doping level, gap, electric field amplitude. The numerical results for weak fields agree with those calculated from available analytic perturbation formulas. For strong when saturation...
Abstract Advances in femtosecond laser-material interaction facilitate the extension of maskless optical processing to high efficiency and deep-subwavelength scale. Here, a hybrid plasmon lithography technique has been demonstrated by irradiating near-infrared laser pulses onto Si material coated with thin Cr films vacuum chamber, superior nanograting structures are found deeply penetrate through film into underlying substrate. In stark contrast common ripple formed on surface, Cr-layer...
The direct photocurrent detection capability of light orbital angular momentum (OAM) has recently been realized with topological Weyl semimetals, but it is limited to the near-infrared wavelength range. extension OAM mid-infrared band, which a wave band that plays an important role in vast range applications, not yet realized. This because responses most photodetectors are neither sensitive phase information nor efficient region. In this study, photodetector based on type-II semimetal...
Recent progress in direct photodetection of light orbital angular momentum (OAM) based on the photogalvanic effect (OPGE) provides an effective way for on-chip electric readout momentum, as well large-scale integration focal-plane array devices. However, recognition OAM order from photocurrent response requires extraction circular polarization-dependent response. To date, operation speed such detector is currently at minute level and limited by slow mechanical polarization modulation low...
Layered gallium sulfide (GaS), a material that has attracted much attention in the field of micro-nano optoelectronics recently, is predicted to have four stable stacking orders (β-, γ-, ε-, and δ-GaS) with close formation energies; β-GaS most considered, other phases are seldom discussed. However, considering ease phase transition few-layer materials, lack accurate crystal identification prevents full understanding this for specific applications requiring phases. Here, we report novel situ...
Water-repellent superhydrophobic (SH) surfaces promise a wide range of applications, from increased buoyancy to drag reduction, but their practical use is limited. This comes the fact that an SH surface will start lose its efficiency once it forced into water or damaged by mechanical abrasion. Here, we circumvent these two most challenging obstacles and demonstrate highly floatable multifaced metallic assembly inspired diving bell spiders fire ant assemblies. We study optimize, both...
Reconfigurable nanophotonic components are essential elements in realizing complex and highly integrated photonic circuits. Here we report a novel concept for devices with functionality to dynamically control guided light the near-visible spectral range, which is illustrated by reconfigurable non-volatile ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>×</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:math> ) switch...