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学者姓名：刘纯亮
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Abstract ：
Surface roughening is an important material surface treatment technique, and it is particularly useful for use in secondary electron yield (SEY) suppression on metal surfaces. Porous structures produced via roughening on coatings have been confirmed to reduce SEY, but the regulation strategy and the influence of process parameters both remain unclear in the practical fabrication of effective porous structures. In this paper, the effect of the surface morphology of porous coatings on the SEY of aluminum alloy substrates was studied. Surface characterization and SEY measurements were carried out for samples with a specific process technique on their surfaces. An exponential fitting model of the correlation between surface roughness and the peak values of SEY curves, delta(m), was summarized. Furthermore, an implementation strategy to enable low surface SEY was achieved from the analysis of the effect of process parameters on surface morphology formation. This work will aid our understanding of the effect of the irregular surface morphology of porous coatings on SEY, thereby revealing low-cost access to the realization of an easy-to-scale process that enables low SEY.
Keyword ：
porous coatings secondary electron yield (SEY) surface morphology wet etching
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| GB/T 7714 | Peng, Min , Lin, Shu , Zhang, Chuxian et al. Effect of the Surface Morphology of Porous Coatings on Secondary Electron Yield of Metal Surface [J]. | MATERIALS , 2022 , 15 (12) . |
| MLA | Peng, Min et al. "Effect of the Surface Morphology of Porous Coatings on Secondary Electron Yield of Metal Surface" . | MATERIALS 15 . 12 (2022) . |
| APA | Peng, Min , Lin, Shu , Zhang, Chuxian , Liang, Haifeng , Liu, Chunliang , Cao, Meng et al. Effect of the Surface Morphology of Porous Coatings on Secondary Electron Yield of Metal Surface . | MATERIALS , 2022 , 15 (12) . |
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Abstract ：
This paper provides a detailed research on near-field-focused (NFF) wireless power transfer (WPT) application using a reflectarray antenna. We apply an analytical model to explore detailed performances on the efficiency of near-field-focused wireless power transfer assuming a Cosine distribution of the E-field amplitude on the aperture. The performance curves are obtained for planar square arrays as a function of the receiving area and the position of the geometrical focal point. A reflectarray with area of 1.3 m2 comprises 60 × 60 units is proposed and simulated at 5.8 GHz. The full-wave simulation results are in a good agreement with the design curves. Full-wave simulations demonstrate that the proposed reflectarray actually forms a focused spot at a distance of 6.3 m, and possesses a high transfer efficiency of 45% at 10 meters away from the array when the receiving area is 0.26 m2, which proves our model possesses significant guideline value for designing WPT system with high efficiency. © 2021 ACM.
Keyword ：
Antenna arrays Broadband networks Efficiency Energy transfer Inductive power transmission
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| GB/T 7714 | Wen, Yao , Bao, Rong , Cao, Meng et al. A near-field-focused reflectarray for highly efficient wireless power transfer application: An NFF reflectarray for highly efficient WPT [C] . 2021 : 250-256 . |
| MLA | Wen, Yao et al. "A near-field-focused reflectarray for highly efficient wireless power transfer application: An NFF reflectarray for highly efficient WPT" . (2021) : 250-256 . |
| APA | Wen, Yao , Bao, Rong , Cao, Meng , Liu, Chunliang . A near-field-focused reflectarray for highly efficient wireless power transfer application: An NFF reflectarray for highly efficient WPT . (2021) : 250-256 . |
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| GB/T 7714 | Zhong, H , Kartashov, Y.V , Szameit, A et al. Topological corner state laser in kagome waveguide arrays [C] . 2021 . |
| MLA | Zhong, H et al. "Topological corner state laser in kagome waveguide arrays" . (2021) . |
| APA | Zhong, H , Kartashov, Y.V , Szameit, A , Li, Y.D , Liu, C.L , Zhang, Y.Q . Topological corner state laser in kagome waveguide arrays . (2021) . |
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Abstract ：
We demonstrate nonlinear valley-Hall edge states (VHESs) in cw-laser-written anisotropic photonic lattices hosting type-II Dirac points. These topological gap quasi-solitons are fundamentally distinct from linear type-I VHESs and from all previously found topological solitons. © OSA 2021, © 2021 The Author(s)
Keyword ：
Continuous wave lasers Optical lattices Photonics Solitons Topology
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| GB/T 7714 | Zhong, Hua , Xia, Shiqi , Li, Yongdong et al. Nonlinear valley hall edge states in type-II Dirac lattices [C] . 2021 . |
| MLA | Zhong, Hua et al. "Nonlinear valley hall edge states in type-II Dirac lattices" . (2021) . |
| APA | Zhong, Hua , Xia, Shiqi , Li, Yongdong , Zhang, Yiqi , Song, Daohong , Liu, Chunliang et al. Nonlinear valley hall edge states in type-II Dirac lattices . (2021) . |
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Abstract ：
In comparison with conventional lasers, whose stability may be affected by perturbations, such as defects and disorder, topological lasers may be remarkably stable when they lase in topologically protected edge states. In this work, we predict that corner laser can be implemented in a new continuous system, which is based on Kagome [1] waveguide arrays, where localized gain can be selectively provided in different waveguides, and where uniform losses, two-photon absorption, and focusing nonlinear interactions are present. Even though lasing in 0D corner states has been recently reported in photonic crystal cavities [2] - [4], this work suggests a new platform based on the continuous waveguide array in cavity-free configuration. We employ localized gain, which, when applied in different corners of our structure, offers unique advantage of highly selective excitation of bulk, edge, or corner nonlinear topological states in higher-order topological insulator. The possibility of such selective excitation in our truly two-dimensional system is a nontrivial result by itself taking into account complex spatial shape of the considered structure. We report on completely stable corner state lasing and bistability of the edge state lasing that can only be observed in the nonlinear medium. The detailed analysis of stability of lasing modes is provided for different values of linear gain and two-photon absorption coefficients. © 2021 IEEE.
Keyword ：
Photons Topology Two photon processes Waveguides
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| GB/T 7714 | Zhong, H , Kartashov, Y.V , Szameit, A et al. Topological Corner State Laser in Kagome Waveguide Arrays [C] . 2021 . |
| MLA | Zhong, H et al. "Topological Corner State Laser in Kagome Waveguide Arrays" . (2021) . |
| APA | Zhong, H , Kartashov, Y.V , Szameit, A , Li, Y.D , Liu, C.L , Zhang, Y.Q . Topological Corner State Laser in Kagome Waveguide Arrays . (2021) . |
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Abstract ：
In comparison with conventional lasers, topological lasers are more robust and can be immune to disorder or defects if lasing occurs in topologically protected states. Previously reported topological lasers were almost exclusively based on the first-order photonic topological insulators. Here, we show that lasing can be achieved in the zero-dimensional corner state in a second-order photonic topological insulator, which is based on the Kagome waveguide array with a rhombic configuration. If gain is present in the corner of the structure, where the topological corner state resides, stable lasing in this state is achieved, with the lowest possible threshold, in the presence of uniform losses and two-photon absorption. When gain acts in other corners of the structure, lasing may occur in edge or bulk states, but it requires substantially larger thresholds, and transition to stable lasing occurs over much larger propagation distances, sometimes due to instabilities, which are absent for lasing in corner states. We find that increasing two-photon absorption generally plays strong stabilizing action for nonlinear lasing states. The transition to stable lasing stimulated by noisy inputs is illustrated. Our work demonstrates the realistic setting for corner state lasers based on higher-order topological insulators realized with waveguide arrays.
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| GB/T 7714 | Zhong, Hua , Kartashov, Yaroslav V. , Szameit, Alexander et al. Theory of topological corner state laser in Kagome waveguide arrays [J]. | APL PHOTONICS , 2021 , 6 (4) . |
| MLA | Zhong, Hua et al. "Theory of topological corner state laser in Kagome waveguide arrays" . | APL PHOTONICS 6 . 4 (2021) . |
| APA | Zhong, Hua , Kartashov, Yaroslav V. , Szameit, Alexander , Li, Yongdong , Liu, Chunliang , Zhang, Yiqi . Theory of topological corner state laser in Kagome waveguide arrays . | APL PHOTONICS , 2021 , 6 (4) . |
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Abstract ：
A microcavity array device decorated by silicon nanowires (SiNWs) is fabricated and the discharge property improvement is investigated. The array device can be operated stably from several kPa to atmospheric pressure of argon, powered by a 20 kHz bipolar nanosecond pulse source. Profiting by electron emission from SiNWs, the microplasma discharge dynamics and emission properties are significantly enhanced. Experimental results manifest that the instantaneous total current of the device decorated by SiNWs is up to ∼20% higher than that of the device without SiNWs and the mean current is increased by ∼12.5% compared with the conventional device (without SiNWs), and the ignition voltage decreased by ∼24%. The setup time is less than 90 ns before the device is fully ignited, and emission intensity enhanced by over 60% compared with the conventional plain surface device. Moreover, calculated by Lissajous figures, the discharge power of proposed device is higher than that of the traditional device with increment of ∼26%, and the impact of SiNWs on microdischarge processes is analyzed. The mechanism of the microplasma property enhancement is discussed through introducing the electric field enhancement effect at SiNWs cap and initial seed electrons emitted from SiNWs. This work combines the characteristic advantages of SiNWs with microcavity gas discharge to achieve the performance improvement of microplasma, and the results reported here has profound impacts on improving microplasma discharge properties and implies potential significance in promoting the performance of plasma applications. © 2021 IOP Publishing Ltd.
Keyword ：
Atmospheric pressure Electron emission Glow discharges Metamaterials Microcavities Nanowires Plasma applications Plasma devices Silicon Ultrafast lasers
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| GB/T 7714 | Ma, Xiaoqin , Wang, Yaogong , Chen, Lichi et al. Silicon nanowires: The promoter of performance improvement of microplasma in a microcavity array device [J]. | Plasma Sources Science and Technology , 2021 , 30 (2) . |
| MLA | Ma, Xiaoqin et al. "Silicon nanowires: The promoter of performance improvement of microplasma in a microcavity array device" . | Plasma Sources Science and Technology 30 . 2 (2021) . |
| APA | Ma, Xiaoqin , Wang, Yaogong , Chen, Lichi , Hu, Long , Wang, Wenjiang , Zhang, Xiaoning et al. Silicon nanowires: The promoter of performance improvement of microplasma in a microcavity array device . | Plasma Sources Science and Technology , 2021 , 30 (2) . |
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Abstract ：
We present an S-band high-power microwave (HPM) oscillator based on crossed-elliptical metamaterial (MTM) rings in a circular waveguide and powered by a high-power electron beam. Particle-in-cell (PIC) simulations demonstrate that when an output horn antenna of radius of 200 mm is used, an output power of 443 MW of a backward wave TE41 mode below its cutoff frequency at 2.80 GHz can be generated using a pulsed electron beam with a voltage of 990 kV and a current of 1.736 kA in a 1.8-T solenoidal magnetic field, corresponding to an electronic efficiency up to 26%. Meanwhile, another degenerate frequency of 2.80 GHz of a forward wave in the TM01 mode with an output power of 9 MW is also observed. When an output horn antenna of radius 150 mm is used, this crossed-elliptical MTM oscillator operates mainly in a forward TM01 mode at 2.80 GHz with an output power of 325 MW at an electronic efficiency of 19%, and at the same time, a backward wave TE41 mode below its cutoff frequency of 2.80 GHz with an output power of 8 MW can be observed. Simulations indicate that this slow-wave structure (SWS) consisting of a periodically crossed-elliptical MTM loaded circular waveguide can support degenerate mode operation. This result suggests that this configuration is favorable for mode switching and this work seeks to design a compact HPM source.
Keyword ：
Circular waveguides Couplings Crossed-elliptical metamaterial (MTM) Cutoff frequency Dispersion Electron beams high-power microwaves (HPMs) Microwave oscillators mode switching particle-in-cell (PIC) simulations Power generation slow-wave structure (SWS)
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| GB/T 7714 | Liu, Meiqin , Schamiloglu, Edl , Wang, Chen et al. PIC Simulation of the Coherent Cerenkov- Cyclotron Radiation Excited by a High-Power Electron Beam in a Crossed-Elliptical Metamaterial Oscillator at S-Band [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2021 , 49 (11) : 3351-3357 . |
| MLA | Liu, Meiqin et al. "PIC Simulation of the Coherent Cerenkov- Cyclotron Radiation Excited by a High-Power Electron Beam in a Crossed-Elliptical Metamaterial Oscillator at S-Band" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 49 . 11 (2021) : 3351-3357 . |
| APA | Liu, Meiqin , Schamiloglu, Edl , Wang, Chen , Feng, Jinjun , Wang, Shaomeng , Fuks, Mikhail I. et al. PIC Simulation of the Coherent Cerenkov- Cyclotron Radiation Excited by a High-Power Electron Beam in a Crossed-Elliptical Metamaterial Oscillator at S-Band . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2021 , 49 (11) , 3351-3357 . |
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Abstract ：
A Dirac point is a linear band crossing point originally used to describe unusual transport properties of materials like graphene. In recent years, there has been a surge of exploration of type-II Dirac/Weyl points using various engineered platforms including photonic crystals, waveguide arrays, metasurfaces, magnetized plasma and polariton micropillars, aiming toward relativistic quantum emulation and understanding of exotic topological phenomena. Such endeavors, however, have focused mainly on linear topological states in real or synthetic Dirac/Weyl materials. We propose and demonstrate nonlinear valley Hall edge (VHE) states in laser-written anisotropic photonic lattices hosting innately the type-II Dirac points. These self-trapped VHE states, manifested as topological gap quasi-solitons that can move along a domain wall unidirectionally without changing their profiles, are independent of external magnetic fields or complex longitudinal modulations, and thus are superior in comparison with previously reported topological edge solitons. Our finding may provide a route for understanding nonlinear phenomena in systems with type-II Dirac points that violate the Lorentz invariance and may bring about possibilities for subsequent technological development in light field manipulation and photonic devices. © The Authors. Published by SPIE and CLP under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
Keyword ：
Electric insulators Landforms Optical lattices Photonic devices Photonics Solitons Topological insulators Topology
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| GB/T 7714 | Zhong, Hua , Xia, Shiqi , Zhang, Yiqi et al. Nonlinear topological valley Hall edge states arising from type-II Dirac cones [J]. | Advanced Photonics , 2021 , 3 (5) . |
| MLA | Zhong, Hua et al. "Nonlinear topological valley Hall edge states arising from type-II Dirac cones" . | Advanced Photonics 3 . 5 (2021) . |
| APA | Zhong, Hua , Xia, Shiqi , Zhang, Yiqi , Li, Yongdong , Song, Daohong , Liu, Chunliang et al. Nonlinear topological valley Hall edge states arising from type-II Dirac cones . | Advanced Photonics , 2021 , 3 (5) . |
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Abstract ：
To suppress the onset of multipactor breakdown on a dielectric surface, a graded permittivity dielectric material is introduced to replace a classical single uniform dielectric material. The electromagnetic field simulation results show that the peak value of the microwave electric field will increase when the center of the microwave window is constructed from a material with a high relative permittivity. However, when the edge of the microwave window is made of such a material, the peak of the microwave electric field will decrease. In addition, the process of multipactor breakdown is investigated using the 2D particle-in-cell method. The results show that the maximum density of electrons that occurs when the edge of the microwave window is constructed from a high-relative-permittivity material is only 66.05% of that which occurs with a uniform dielectric material. As a result, the threshold of multipactor breakdown can be improved. The results reported in this paper can be used to guide the design of microwave windows. © 2021 Author(s).
Keyword ：
Dielectric materials Electric fields Electromagnetic fields Electromagnetic simulation Microwaves Permittivity
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| GB/T 7714 | Zhang, Jianwei , Zhai, Yonggui , Qiang, Lanpeng et al. Improving the threshold of multipactor using a graded permittivity dielectric window [J]. | Physics of Plasmas , 2021 , 28 (2) . |
| MLA | Zhang, Jianwei et al. "Improving the threshold of multipactor using a graded permittivity dielectric window" . | Physics of Plasmas 28 . 2 (2021) . |
| APA | Zhang, Jianwei , Zhai, Yonggui , Qiang, Lanpeng , Luo, Wei , Wang, Hongguang , Li, Yongdong et al. Improving the threshold of multipactor using a graded permittivity dielectric window . | Physics of Plasmas , 2021 , 28 (2) . |
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