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基于氧化钒的动态超表面

Science China materials 2023年第1期66卷 284-290页

作者：李月谢建良邓龙江彭波 National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of ChinaChengdu 611731China Key Laboratory of Multi Spectral Absorbing materials and Structures of Ministry of Education University of Electronic Science and Technology of ChinaChengdu 611731China

动态调控是现代光学器件中必不可少的特性,在激光雷达系统、显示器件以及数码相机等设备中具有重要意义.与传统的体光学器件相比,动态超表面为实现小型化和集成化智能光学系统提供了一个极具吸引力的解决方案.相变材料具有高的折射率对... 详细信息

动态调控是现代光学器件中必不可少的特性,在激光雷达系统、显示器件以及数码相机等设备中具有重要意义.与传统的体光学器件相比,动态超表面为实现小型化和集成化智能光学系统提供了一个极具吸引力的解决方案.相变材料具有高的折射率对比度和易于操控的特性,是设计动态超表面的理想材料.本文通过操控氧化钒的相变,在近红外区域设计实现了可调谐的超构透镜和可切换图像编码的超表面器件.通过控制氧化钒的相变,能够改变超透镜的聚焦强度,实现强度对比约为12倍的开关聚焦效果.此外,利用氧化钒的相变还设计实现了任意两个不同数字图案的可切换成像.本工作为实现动态成像和光学加密系统的可调谐超表面奠定了基础.

关键词：光学加密光学器件激光雷达系统氧化钒动态调控图像编码动态成像显示器件

Thermal management by manipulating electromagnetic parameters

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Chinese Physics B 2024年第5期33卷 21-27页

作者：王云梁迪飞韩天成邓龙江 National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of ChinaChengdu 611731China Key Laboratory of Multi-spectral Absorbing materials and Structures of Ministry of Education University of Electronic Science and Technology of ChinaChengdu 611731China

electromagnetic absorbing materials may convert electromagnetic energy into heat energy and dissipate it.However,in a high-power electromagnetic radiation environment,the temperature of the absorbing material rises significantly and even burns.It becomes critical to ensure electromagnetic absorption performance while minimizing temperature rise.Here,we systematically study the coupling mechanism between the electromagnetic field and the temperature field when the absorbing material is irradiated by electromagnetic waves.We find out the influence of the constitutive parameters of the absorbing materials(including uniform and non-uniform)on the temperature distribution.Finally,through a smart design,we achieve better absorption and lower temperature simultaneously.The accuracy of the model is affirmed as simulation results aligned with theoretical analysis.This work provides a new avenue to control the temperature distribution of absorbing materials.

关键词： multi-physics field electromagnetic-thermal coupling microwave absorption high power application

Growth,optical dispersion and magnetic behavior of Dy3+ doped yttrium iron garnet crystals

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Journal of Rare Earths 2024年第6期42卷 1110-1117页

作者： Yating Fang Hui Shen Yudie Ma Shijie Liao Shuang Xia Tian Tian Ding Zhou Yunfeng Ma Jiayue Xu Institute of Crystal Growth School of Materials Science and EngineeringShanghai Institute of Technology national engineering center of electromagnetic radiation control materials School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of China

Y3Fe5O12(YIG) crystals are highly desirable for the fabrication of mid-infrared isolators with the rapid growth of optical communications,although it is rather challenging to grow large size and high-quality single crystals.Dy3+doping is expected to improve the optical and magneto-optical prope rties.However,high quality Dy:YIG crystals and the adjustment of Dy3+ on the structure and optical behavior of YIG crystal remain unclear,impeding its practical applications.Herein,a series of Y3-xDyxFe5O12(x=0,0.5,1.0,1.5,3) solid solution crystals was grown by the flux-Bridgman method and single crystals up to 25 mm were obtained.With the introduction of Dy3+,lattice parameters are gradually enlarged from 1.2379 nm(YIG) to 1.2420 nm(DyIG).Typical Dy3+absorption peaks are observed around 1070,1265 and 1670 nm.The refractive index decreases from 2.37(500 nm) to 2.10(2500 nm) for YIG crystal,and it reduces from 2.47(500 nm) to 2.16(2500 nm) for DyIG crystal.The optical bandgaps remain almost unchanged for Dy:YIG crystals.The optical dispersion of the refractive indices was finely fitted by the Wemple and DiDomenico(WDD) and the Sellmeier models,respectively.With the increase of Dy3+content,the saturation magnetization(Ms) decreases significantly from 23.62 emu/g(YIG) to 5.33 emu/g(DyIG).Small coercive field is persisted for this system,endowing small external magnetic field.These results provide valuable references for the manipulation of rare earths on the properties of magnetooptical crystals,which is beneficial to the design of high-performance garnet crystals for the application of optical switching and non-reciprocal related devices.

关键词： Crystal growth Dy3+ doping Magneto-optical crystal Optical dispersion Rare earths Yttrium iron garnet

Magnetic-Biased Spin-Phonon Coupling in Ferromagnetic Few-layer CrI3

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Magnetic-Biased Spin-Phonon Coupling in Ferromagnetic Few-la...

Influence of filling atoms on radial collapse and elasticity of carbon nanotubes under hydrostatic pressure

第二十届全国光散射学术会议（CNCLS20）

作者： Kai Guo Longjiang Deng Bo Peng National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of China

Long-range magnetic orders in atomically thin Ising ferromagnetic CrI together with their promising electronic and optical properties give rise to new fascinating physics.However,to date,there has been no experimentally comprehensive understanding of the lattice dynamics in such 2D ferromagnets.Here,we report the layer,temperature

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Science Bulletin 2015年第17期60卷 1509-1516页

作者： Zhi-De Han Cui-Cui Ling Qi-Kai Guo Hai-Peng Lu Hong-Guang Sui Jiao-Jian Yin Long-Jiang Deng College of Science China University of Petroleum National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of China State Key Laboratory of Heavy Oil Processing China University of Petroleum

Using molecular mechanics and molecular dynamics simulations, we focus on the influence of filling atoms on radial collapse and elasticity of single-walled carbon nanotubes(SWNTs). It is shown that the filled argon(Ar) and silicon(Si) atoms can effectively improve the resistance to high pressure and radial elasticity of SWNT, which may attribute to the strong repulsive force from the filled Ar(Si) atoms. However, due to the strong interaction of Cu atoms, filling Cu atoms deteriorate SWNT's radial elasticity. In addition, it is found that the phase transitions of the atoms filled in SWNT occur in the process of loading and unloading pressure, so that the electrical properties of the SWNTs filled with atoms change in the process of loading and unloading pressure. In view of the restorability of SWNT filled with Si atoms upon unloading, the filled SWNTs can be used to develop a new class of nano-electronic devices such as pressure sensor, relay and memory, etc.

关键词：单壁碳纳米管压力作用原子能填充弹性径向分子动力学模拟坍塌

Influence of Re-ions with different ionic radius in Ba_(12)ReNb_(9)O_(36) on crystal structure and microwave dielectric properties

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Journal of Materiomics 2022年第1期8卷 104-112页

作者： Pengcheng Zhang Hao Li Xiaoqing Chen Xing Zhang Hongcheng Yang Canbing Li Shuren Zhang College of Electrical and Information engineering Hunan UniversityChangsha410082China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of ChinaChengdu610054China

The Ba_(12)ReNb_(9)O_(36)(Re=Yb,Ce,Tm,Er,Y,Ho,Dy,Gd)ceramics are synthesized by solid-phase reaction method.The phase composition,crystal structure,microstructure,and microwave dielectric properties of the ceramics are investigated by X-ray diffraction,X-ray photoelectron spectroscopy,Scanning electron microscopy and Raman spectrum.The optimal microwave dielectric properties(ε_(r)=37.23,Q×f=36600 GHz,andτ_(f)=34 ppm/℃)are obtained for Ba_(12)YbNb_(9)O_(36) ceramic sintered at 1420℃for 6 h.In this system,the variation of dielectric constant is dominated by polarizability.The Q×f is mainly affected by internal strain/fluctuation of d-spacing.The variation of τ_(f) is related to the temperature coefficient of dielectric constant and the oxygen octahedron distortion.Furthermore,the reduction of Ce^(4+) ions,the relative density,linear thermal expansion coefficient,and the second phase are also important factors affecting microwave dielectric properties.

关键词： Microwave dielectric ceramic Ba_(12)ReNb_(9)O_(36) Polarizability Raman spectrum

Low-firing,temperature stable and improved microwave dielectric properties of ZnO-TiO_(2)-Nb_(2)O_(5) composite ceramics

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Journal of Materiomics 2019年第3期5卷 471-479页

作者： Hongyu Yang Shuren Zhang Yawei Chen Hongcheng Yang Zixuan Fang Ying Yuan Enzhu Li National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of ChinaChengdu610054China Key Laboratory of Multi-Spectral Absorbing materials and Structures of Ministry of Education University of Electronic Science and Technology of ChinaChengdu610054China

This article presents low-firing,low-loss and temperature stable ZnO-TiO_(2)-Nb_(2)O_(5) microwave dielectric composite ceramics with the assistance of lithium borosilicate(LBS)and zinc borosilicate(ZBS)glass frits.There is a liquid phase(eutectic mixture)generated by LBS(ZBS)glass,and solid particles could be wetted and dissolved.Therefore,the migrations and rearrangements of particles could be performed.Besides,compared with ceramics undoped with glass frits,lower activation energies(E_(a))of ceramics doped with LBS and ZBS glass suggest that the low-temperature sintering behavior is easier to carry out.The results indicated that LBS and ZBS glass both are effective sintering aids to accelerate the sintering process and improve the microwave dielectric properties of composite ceramics by controlling the phase compositions under low temperature.Combination great properties of ZnO-TiO_(2)-Nb_(2)O_(5) ceramics were obtained when sintered at 900℃ for 4 h:ε_(r)=36.7,Q×f=20,000 GHz,τ_(f)=7 ppm/℃.

关键词： ZnO-TiO_(2)-Nb_(2)O_(5) Composite ceramics Dielectric

A microwave RCS reduction structure by antarafacial reflection design of gradient metasurface

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A microwave RCS reduction structure by antarafacial reflecti...

Strategy to boost hydrolysis resistance and stabilize low infrared emissivity of ZrB_(2) via nanoscale LaF_(3) surface modification

2017Altair技术大会

作者： Yang Zhou Guorui Zhang Peiheng Zhou Haiyan Chen Jianliang Xie Longjiang Deng National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Devices

A microwave gradient meta-surface is designed and fabricated. The structure is consist of a stack of two-dimensional(x-axis and y-axis) arrays of gradually-varied sub-wavelength elliptical rings, a dielectric substrate and a metallic ground plane. Both theoretical and experimental studies are conducted to demonstrate that the carefully designed y-axis phase gradient meta-surface supports high-efficiency y-axis reflections when a microwave plane wave incident along x-axis. Owing to the y-axis anomalous reflection, the reflected wave no longer lies in the incidence plane(XOZ plane)and leads to the reduction of monostatic RCS. Compared with previously reported gradient metasurfaces in microwave regime, our design shows an improved effective incidence angular domain. Our work may be applied to flat or complex objects in order to reduce the target monostatic RCS, such as mirror plate, corner reflector and cavity structure.pplying the theory of finite element analysis,the paper is analysed the intension of the steer-arm in the steer system and got the stress draw of the steer-arm. The analysis can advance the controlling flexible of the heavy off-road vehicle and is the optimize design basis of steer-arm.

关键词： microwave gradient metasurface RCS reduction antarafacial reflection FEKO

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Rare Metals 2022年第12期41卷 4164-4175页

作者： Xue-Jing Xing Xian Jian Lin-Bo Zhang Hai-Peng Lu Zhong-Wei Zhang Simeon Agathopoulos Liang-Jun Yin Long-Jiang Deng School of materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China The Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of ChinaChengdu 611731China Laboratory of Energy Storage and New Energy materials Technology Central Research InstituteDongfang Electric CorporationChengdu 611731China Department of materials Science and engineering University of Ioanninaloannina 45110Greece

Owing to its excellent high-temperature resistance and high conductivity,zirconium diboride(ZrB_(2)) has been applied as an infrared suppression coating.However,ZrB_(2)is susceptible to hydrolysis under high-moisture conditions and even under mild working temperatures.The improvement in the hydrophobicity of the ZrB_(2)surface effectively reduces wetting by water and suppresses hydrolysis reaction,particularly under high-temperature and high-moisture conditions.Herein,we report a novel,easy,and highly reproducible method for producing a fully coated ZrB_(2)surface by developing a nanoscale hydrophobic layer of glassy LaF_(3)on the surface of ZrB_(2)powder particles in situ(i.e.,during the carbothermal synthesis of ZrB_(2)).Through the tests carried out at 200 ℃for 100-300 h in a hydrothermal reactor,the produced powders displayed remarkably high long-term hydrolysis resistance and pronounced chemical stability.Compared with treated ZrB_(2),ZrB_(2)@LaF_(3)remained lower infrared emissivity when continuously intensifying hydrolyzation process.The results suggest that a nanoscale surface modification strategy can be applied to stabilize the infrared emissivity of ZrB_(2)in a water-oxygen coupling environment.

关键词： ZrB_(2) LaF_(3) Carbothermal reaction Hydrolysis resistance Hydrophobic behavior