A5023688578- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Graphene research and applications
- 2D Materials and Applications
- Advanced Fiber Laser Technologies
- Thermal Radiation and Cooling Technologies
- Optical Coatings and Gratings
- Orbital Angular Momentum in Optics
- Gold and Silver Nanoparticles Synthesis and Applications
- Mechanical and Optical Resonators
- MXene and MAX Phase Materials
- Advanced Antenna and Metasurface Technologies
- Topological Materials and Phenomena
- Quantum Dots Synthesis And Properties
- Advanced Chemical Physics Studies
- Phase-change materials and chalcogenides
- Photorefractive and Nonlinear Optics
- Quantum Mechanics and Non-Hermitian Physics
- Perovskite Materials and Applications
- Advanced Photocatalysis Techniques
- Neural Networks and Reservoir Computing
- Gas Sensing Nanomaterials and Sensors
- Terahertz technology and applications
National University of Defense Technology
2016-2025
NARI Group (China)
2022
Changsha University
2015-2020
Guangzhou University
2017
Centre for High Performance Computing
2015
University of Southern Denmark
2012
Nanjing University
2008-2010
National Laboratory of Solid State Microstructures
2008-2010
Collaborative Innovation Center of Advanced Microstructures
2010
Sichuan University
2002
We show numerically that both coherent perfect absorption and transparency can be realized in a monolayer graphene. The graphene film, doped patterned with periodical array of holes, support plasmonic resonances the Mid-infrared range. Under illumination two counter-propagating optical beams, resonant may tuned continuously from 99.93% to less than 0.01% by controlling their relative phase which gives modulation contrast 40 dB (about 30 for transmission). phenomenon provides versatile...
Graphene plasmonics shows potential for light trapping in mid-infrared and THz photodetectors with high efficiency tunable spectral selectivity.
Monolayer graphene coupled with subwavelength gratings on top of a gold mirror are experimentally demonstrated total absorption over 99% at wavelength around 1.5 μm full-width half maximum (FWHM) about 20 nm. The experimental results confirm convincingly the theoretical prediction complete optical for monolayer-graphene-based structures in near-infrared range. As novel 2D material, has been studied intensively due to its outstanding and electronic properties.1-9 Graphene full spectrum...
Dielectric loaded graphene plasmon waveguide (DLGPW) is proposed and investigated. An analytical model based on effective-index method presented verified by the finite element simulations. The mode effective index, propagation loss, cutoff wavelength of higher order modes single-mode operation region were derived at mid-infrared spectral region. By changing Fermi energy level, properties fundamental could be tuned flexibly. structure DLGPW simple easy for fabrication. It provided a new...
High quality p-n junctions based on 2D layered materials (2DLMs) are urgent to exploit, because of their unique properties such as flexibility, high absorption, and tunability which may be utilized in next-generation photovoltaic devices. Based transfer technology, large amounts vertical heterojunctions 2DLMs investigated. However, the complicated fabrication process inevitable defects at interfaces greatly limit application prospects. Here, an in-plane intramolecular WSe2 junction is...
This paper presents an comprehensive study of light trapping and absorption enhancement in graphene through metallic plasmonic structures shows a strategy to realize both ultrabroadband strong enhancement. Three different absorber designs are investigated by numerical simulations. The excitation localized plasmons the significantly enhances interactions between at resonances. By employing splitted cross design for resonant antennas integrating two types sub-antennas with sizes, more than 30%...
Two-dimensional (2D) materials have got extensive attention for multifunctional device applications in advanced nanoelectronics and optoelectronics, such as field-effect transistors, photodiodes, solar cells. In our work, we fabricated MoTe2-MoS2 van der Waals heterostructure photodetectors with great performance using the mechanical exfoliation method restack technique. It is demonstrated that photodetector can operate without bias voltage, possessing a low dark current (10 pA) high...
We present a light-by-light photonic crystal configuration consisting of bend waveguide with three embedded Kerr-type nonlinear rods and T-branch waveguide. show that such can also demonstrate all-optical AND gate operation extremely high-contrast between the OFF state ON in its transmission. Because presented switching is simple, this facilitates fabricating practical devices further large-scale optical integration.
Strong subwavelength field enhancement has often been assumed to be unique plasmonic nanostructures. Here we propose a type of all-dielectric metamaterials based on split bar resonators. The nano gap at the centre resonant elements results in large local and light localization surrounding medium, which can employed for strong light-matter interactions. In Fano-resonant dielectric metamaterial comprising pairs asymmetric silicon bars, electric amplitude exceeds 120 while averaged...
Abstract We propose a broadband terahertz absorber consisting of nonstructured graphene loaded with arrays elliptic dielectric cylinders. The relative bandwidth for the absorption above 90% reaches about 65%. working mechanism broad mainly comes from two aspects. One is that cylinders provides multiple discrete plasmon resonances large frequency interval. other that, each resonance, there exists set continuous because width structure varies continuously and gradiently. we demonstrate here,...
Black phosphorus exhibits extreme anisotropic properties due to its special lattice structure. In this paper, we numerically show that strong perfect absorption can be realized in a nanostructured monolayer black with the excitation of plasmonic resonances. Under normal incidences, structure shows 99.56% for one polarization at resonance wavelength while only 9.48% other same wavelength. The responses are purely attributed intrinsic material anisotropy which is different from conventional...
Broadband optical absorption structures in the near infrared by coupling monolayer-graphene with periodical metal are proposed and demonstrated numerically. Optical of graphene over-50%-absorption bandwidth up to hundreds nanometer caused magnetic dipole resonances effect investigated detail, bandwidths one order higher than those dielectric guiding mode resonances. In addition, influences geometrical parameters fully analyzed these show angular-insensitive for oblique incidence a large...
Owing to the fascinating properties, emergence of two-dimensional (2D) materials brings various important applications electronic and optoelectronic devices from field-effect transistors (FETs) photodetectors. As a zero-band-gap material, graphene has excellent electric conductivity ultrahigh carrier mobility, while ON/OFF ratio FET is severely low. Semiconducting 2D transition metal chalcogenides (TMDCs) exhibit an appropriate band gap, realizing FETs with high compensating for...
Based on an analysis of the surface admittance a plasmonic film with substrate, we propose ultrathin quarter-wave plate consisting periodic plane array symmetrical L-shaped antennas. The period, which determines coupling among antennas, is important parameter for optimizing performance structure. Numerical simulation results show that Au designed in this Letter can efficiently convert linearly polarized light at normal incidence into circularly light, whose ellipticity 0.994 operating...
Subwavelength perfect optical absorption structures based on monolayer-graphene are analyzed and demonstrated experimentally. The mechanism is a result of critical coupling relating to guided mode resonance low index two-dimensional periodic structure. Peak over 99% at wavelength 1526.5 nm with full-width half maximum (FWHM) about 18 from fabricated structure period 1230 nm, the measured results agree well simulation results. In addition, influence geometrical parameters angular response for...
Graphene photodetectors are highly attractive owing to its ultra-fast and wide-range spectral response from visible infrared benefit the superior carrier mobility linear dispersion with zero bandgap of graphene. The application graphene however is seriously limited by low intrinsic responsivity in order ∼10 mA/W. Here, we demonstrate photogating field-effect transistors based on pure monolayer simple device structures. light absorption heavily n-doped silicon/silicon oxide (Si/SiO2)...
Growing uniform oxides with various thickness on TMDs is one of the biggest challenges to integrate into complementary metal oxide semiconductor (CMOS) logic circuits. Here, we report a layer-by-layer oxidation atomically thin MoTe2 flakes via ozone (O3) exposure. The MoOx film could be tuning atomic-level accuracy simply by varying O3 exposure time. Additionally, MoOx-covered shows hole-dominated transport behavior. Our findings point simple and effective strategy for growing homogenous...
Plasmonics of two-dimensional materials have attracted increasing attention in the past few years. It provides a platform for strong light-matter interactions and enables variety novel applications infrared terahertz ranges. In this paper, we study plasmonic properties graphene-black phosphorus (G-BP) bilayer. exhibits both highly anisotropic responses that performs beyond individual graphene black films. Polarization dependent, perfect absorption can be realized type nanostructures with...
We propose and numerically analyze a mid-infrared electrically controllable plasmonic waveguide directional coupler that is composed of two parallel identical straight dielectric loaded graphene S-shaped bends. By varying the Fermi energy level sheet, maximum power coupled from input to cross-waveguide corresponding coupling length could be effectively tuned. Under different level, this serve as an controlled optical switch or 3-dB splitter around wavelength 10.5 μm. Moreover, size entire...
We present a wave absorption design consisting of periodical arrays dielectric bricks on the substrate, which is coated with single-layered and nonstructured graphene, supported by thick piece metal. The demonstrated to broadband near-perfect 0.82 terahertz (THz) bandwidth over 90% central frequency 1.68 THz. mechanism originates from two contributions. Firstly, graphene can provide both set plasmon resonances large relative interval radiation rate γ/ω in THz range. Secondly, linewidth each...