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Metamaterial terahertz device with temperature regulation function that can achieve perfect absorption and complete reflection conversion of ultrawideband

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Communications in Theoretical Physics 2024年第7期76卷 123-133页

作者： Hao Sun zao yi Can Ma Shubo Cheng Bin Tang Qingdong Zeng Sohail Ahmad School of Mathematics and Science Joint Laboratory for Extreme Conditions Matter PropertiesState Key Laboratory of Environment-Friendly Energy MaterialsTianfu Institute of Research and InnovationSouthwest University of Science and TechnologyMianyang 621010China Department of Oncology Sichuan Science City HospitalMianyangSichuan Province621000China School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhouHubei 434023China School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China School of Physics and Electronic Information Engineering Hubei Engineering UniversityXiaogan 432000China Institute of Physics Bahauddin Zakariya UniversityMultan 66000Pakistan

The field of terahertz devices is important in terahertz ***,most of the current devices have limited functionality and poor *** improve device performance and achieve multifunctionality,we designed a terahertz device based on a combination of VO_(2)and *** device can be tuned using the phase-transition characteristics of VO_(2),which is included in the triple-layer structure of the device,along with SiO_(2)and *** terahertz device exhibits various advantageous features,including broadband coverage,high absorption capability,dynamic tunability,simple structural design,polarization insensitivity,and incidentangle *** simulation results showed that by controlling the temperature,the terahertz device achieved a thermal modulation range of spectral absorption from 0 to *** 313 K,the device exhibited complete reflection of terahertz *** the temperature increased,the absorption rate also *** the temperature reached 353 K,the device absorption rate exceeded 97.7%in the range of 5-8.55 *** study used the effective medium theory to elucidate the correlation between conductivity and temperature during the phase transition of VO_(2).Simultaneously,the variation in device performance was further elucidated by analyzing and depicting the intensity distribution of the electric field on the device surface at different ***,the impact of various structural parameters on device performance was examined,offering valuable insights and suggestions for selecting suitable parameter values in real-world *** characteristics render the device highly promising for applications in stealth technology,energy harvesting,modulation,and other related fields,thus showcasing its significant potential.

关键词： terahertz perfect absorption complete reflection temperature regulation ultrawideband smart device

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Multi-functional metasurface:ultra-wideband/multi-band absorption switching by adjusting guided-mode resonance and local surface plasmon resonance effects

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Communications in Theoretical Physics 2024年第6期76卷 174-184页

作者： Wenxin Li Shubo Cheng Huafeng Zhang zao yi Bin Tang Can Ma Pinghui Wu Qingdong Zeng Rizwan Raza School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhouHubei 434023China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China Department of Oncology Sichuan Science City HospitalMianyangSichuan Province 621000China Office of Science and Technology Quanzhou Normal UniversityQuanzhou 362000China School of Physics and Electronic-information Engineering Hubei Engineering UniversityXiaogan 432000China Department of Physics COMSATS Institute of Information Technology 54000 LahorePakistan

This study introduces an innovative dual-tunable absorption film with the capability to switch between ultra-wideband and narrowband *** manipulating the temperature,the film can achieve multi-band absorption within the 30-45 THz range or ultra-wideband absorption spanning 30-130 THz,with an absorption rate exceeding ***,the structural parameters of the absorption film are optimized using the particle swarm optimization(PSO)algorithm to ensure the optimal absorption *** absorption response of the film is primarily attributed to the coupling of guided-mode resonance and local surface plasmon resonance *** film's symmetric structure enables polarization incoherence and allows for tuning through various means such as doping/voltage,temperature and structural *** the case of a multi-band absorption response,the film exhibits good sensitivity to refractive index changes in multiple absorption ***,the absorption spectrum of the film remains effective even at large incidence angles,making it highly promising for applications in fields such as biosensing and infrared stealth.

关键词： PSO optimization ultra-wideband/narrowband absorption switching intelligent absorption film vanadium dioxide

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Antibacterial ability and biocompatibility of fluorinated titanium by plasma-based surface modification

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Rare Metals 2022年第2期41卷 689-699页

作者： Mian Chen Xiao-Qiao Wang Er-Lin Zhang yi-zao Wan Jian Hu Jiangxi Key Laboratory of Nanobiomaterials Institute of Advanced MaterialsEast China Jiaotong UniversityNanchang 330013China Key Laboratory for Anisotropy and Texture of Materials(ATM) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China

Biomaterial surfaces with satisfied antibacterial activity and appropriate cytocompatibility are a pressing clinical need for orthopedic and dental *** biomaterials have been demonstrated to obtain antibacterial activity and osteogenic property,while the effect of fluorine chemical compositions on antibacterial property and cytocompatibility is rarely *** this end,the coatings with different fluorine chemical compositions on titanium surface were prepared by plasma treatment to verify the antibacterial ability and cytocompatibility of fluorinated *** antibacterial ability was evaluated by using Staphylococcus aureus,and the cell compatibility was investigated with MC3T3-E1 cells in *** results show that both fluorocarbon coating and metal fluorides coating exhibited a hydrophilic and nano-scaled *** than the fluorocarbon coating,the coating composed of metal fluorides presented satisfied bactericide effect and excellent *** antibacterial mechanism is associated with the metal fluorides and released fluoride *** work would provide novel sight in optimizing the surface modification method of fluorinated biomaterials for biomedical applications.

关键词： Titanium Plasma-based technology Fluorine Antibacterial property Cytocompatibility

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不同应变率下高强钢的拉伸行为及力学性能分析

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高压物理学报 2024年第3期38卷 37-48页

作者：洛绒邓珠刘潇如杨佳肖礼康郭亮魏占涛周章洋易早刘艺房雷鸣熊政伟西南科技大学数理学院极端条件物质特性联合实验室四川绵阳621010 中国工程物理研究院流体物理研究所四川绵阳621999 西南应用磁学研究所四川绵阳621010 中国工程物理研究院核物理与化学研究所四川绵阳621999 四川省军民融合研究院四川绵阳621010

高强钢因强度高、塑性好、耐腐蚀性优异而得到广泛应用。然而,高强钢具有显著的应变率敏感性。为此,针对2种高强钢(Ultrafort 401和Ferrium S53钢),开展了不同应变率下(10^(-4)~10^(3) s^(-1))的拉伸试验,获得了屈服强度、抗拉强度、硬... 详细信息

高强钢因强度高、塑性好、耐腐蚀性优异而得到广泛应用。然而,高强钢具有显著的应变率敏感性。为此,针对2种高强钢(Ultrafort 401和Ferrium S53钢),开展了不同应变率下(10^(-4)~10^(3) s^(-1))的拉伸试验,获得了屈服强度、抗拉强度、硬化指数等性能参量,并深入分析了其随应变率变化的规律。不同应变率下,Ferrium S53钢的拉伸性能始终优于Ultrafort 401钢,但两者却表现出不同的变化趋势。随着应变率的增加,Ultrafort 401钢的屈服强度和抗拉强度均增大,而Ferrium S53钢的屈服强度增大,抗拉强度先减小后增大。结合微观结构表征发现,Ferrium S53钢所具有的较高的屈服强度与其初始晶粒尺寸更小有关,2种高强钢的抗拉强度随应变率增加所表现出的不同变化趋势则与应变硬化响应差异有关。随着应变率的升高,Ultrafort 401钢的韧窝尺寸增大,而Ferrium S53钢的韧窝尺寸先减小后增大,说明2种高强钢的应变硬化水平随着应变率升高而呈现不同的变化趋势。研究结果为高强钢在不同加载条件下的力学性能评估提供了科学依据,对高强钢的工程应用具有一定的指导意义。

关键词：高强钢拉伸性能应变率断口形貌屈服强度抗拉强度

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Preparation and Characterization of Copper-Nickel Bulk Nanocrystals

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Journal of Wuhan University of Technology(Materials Science) 2014年第3期29卷 606-611页

作者：吴小强 TANG Yongjian WANG Lan AN Xuguang yi zao 孙卫国 Department of Materials Science and Engineering Xihua University Research Center of Laser Fusion China Academy of Engineering Physics

Copper-nickel nanoparticle was directly prepared by flow-levitation method （FL） and sintered by vacuum sintering of powder （VSP） method. Several characterizations, such as transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, differential thermal analysis （DTA）, and energy-dispersive X-ray spectroscopy （EDX） were used to investigate the prepared nanostructures. The results of the study show that FL method could prepare high purity Cu-Ni nanocrystals of uniform spheres with size distribution between 20 and 90 nm. After sintering the bulk nanocrystalline copper-nickel has obvious thermal stability and the surface Webster hardness increases with the rising sintering temperature. At the temperature of 900 ℃, the specimen shows higher surface Webster hardness, which is about two times of traditional materials. When the sintering temperature arrives at 1 000 ℃ the relative density of bulk nanocrystals can reach 97.86 percent. In this paper, the variation tendency of porosity, phase and particles size of bulk along with the changing of sintering temperature have been studied.

关键词： bulk nanocrystals flow-levitation method surface Webster hardness vacuum sintering of powder

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Refractive index sensing of double Fano resonance excited by nano-cube array coupled with multilayer all-dielectric film

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Chinese Physics B 2022年第2期31卷 372-379页

作者： Xiangxian Wang Jian Zhang Jiankai Zhu zao yi Jianli Yu School of Science Lanzhou University of TechnologyLanzhou 730050China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China School of Electronic Engineering Chaohu UniversityChaohu 238000China

We propose a hybrid structure of a nano-cube array coupled with multilayer full-dielectric thin films for refractive index *** this structure,discrete states generated by two-dimensional grating and continuous states generated by a photonic crystal were coupled at a specific wavelength to form two Fano *** transmission spectra and electric field distributions of the structure were obtained via the finite-difference time-domain *** obtained the optimal structural parameters after optimizing the geometrical *** the optimal parameters,the figure of merit(FOM)values of the two Fano resonances reached 1.7×10^(4)and 3.9×10^(3),*** results indicate that the proposed structure can achieve high FOM refractive index sensing,thus offering extensive application prospects in the biological and chemical fields.

关键词： Fano resonance refractive index nano-cube array all-dielectric film

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Alkali-metal(Li, Na, and K)-adsorbed MoSi_(2)N_(4) monolayer: an investigation of its outstanding electronic, optical, and photocatalytic properties

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Communications in Theoretical Physics 2022年第1期74卷 96-104页

作者： Zhiyuan Sun Jing Xu Nsajigwa Mwankemwa Wenxing Yang Xianwen Wu zao yi Shanjun Chen Weibin Zhang School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China

Single-layer MoSi_(2)N_(4),a high-quality two-dimensional material,has recently been fabricated by chemical vapor *** by this latest experimental work,herein,we apply first principles calculations to investigate the electronic,optical,and photocatalytic properties of alkali-metal(Li,Na,and K)-adsorbed MoSi_(2)N_(4) *** electronic structure analysis shows that pristine MoSi_(2)N_(4) monolayer exhibits an indirect bandgap(E_(g)=1.89 eV).By contrast,the bandgaps of one Li-,Na-,and K-adsorbed MoSi_(2)N_(4) monolayer are 1.73 eV,1.61 eV,and 1.75 eV,***,the work function of MoSi_(2)N_(4) monolayer(4.80 eV)is significantly reduced after the adsorption of alkali metal *** work functions of one Li-,Na-,and K-adsorbed MoSi_(2)N_(4) monolayer are 1.50 eV,1.43 eV,and 2.03 eV,***,optical investigations indicate that alkali metal adsorption processes substantially increase the visible light absorption range and coefficient of MoSi_(2)N_(4) ***,based on redox potential variations after alkali metals are adsorbed,Li-and Na-adsorbed MoSi_(2)N_(4) monolayers are more suitable for the water splitting photocatalytic process,and the Li-adsorbed case shows the highest potential application for CO_(2) *** conclusion,alkali-metal-adsorbed MoSi_(2)N_(4) monolayer exhibits promising applications as novel optoelectronic devices and photocatalytic materials due to its unique physical and chemical properties.

关键词： MoSi_(2)N_(4) first-principles alkali metal adsorbed electronic structure optical properties photocatalysis

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Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces

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Chinese Physics B 2021年第2期30卷 336-343页

作者： Yunping Qi Baohe Zhang Jinghui Ding Ting Zhang Xiangxian Wang zao yi College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China School of Science Lanzhou University of TechnologyLanzhou 730050China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621900China

Benefiting from the unprecedented superiority of coding metasurfaces at manipulating electromagnetic waves in the microwave band,in this paper,we use the Pancharatnam-Berry(PB)phase concept to propose a high-efficiency reflectivetype coding metasurface that can arbitrarily manipulate the scattering pattern of terahertz waves and implement many novel *** optimizing the coding sequences,we demonstrate that the designed 1-,2-,and 3-bit coding metasurfaces with specific coding sequences have the strong ability to control reflected terahertz *** two proposed1-bit coding metasurfaces demonstrate that the reflected terahertz beam can be redirected and arbitrarily *** normally incident x-and y-polarized waves,a 10 d B radar cross-section(RCS)reduction can be achieved from 2.1 THz to5.2 THz using the designed 2-bit coding ***,two kinds of orbital angular momentum(OAM)vortex beams with different moduli are generated by a coding metasurface using different coding *** research provides a new degree of freedom for the sophisticated manipulation of terahertz waves,and contributes to the development of metasurfaces towards practical applications.

关键词： coding metasurface Pancharatnam-Berry phase multiple beams radar cross-section(RCS)reduction orbital angular momentum

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A multi-band and polarization-independent perfect absorber based on Dirac semimetals circles and semi-ellipses array

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Chinese Physics B 2021年第9期30卷 574-578页

作者： Zhiyou Li yingting yi Danyang Xu Hua Yang zao yi Xifang Chen Yougen yi Jianguo Zhang Pinghui Wu Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China College of Physics and Electronics Central South UniversityChangsha 410083China College of Science Zhejiang University of TechnologyHangzhou 310023China Department of Physics and Electronic Engineering Jinzhong UniversityJinzhong 030619China Research Center for Photonic Technology Key Laboratory of Information Functional Material for Fujian Higher EducationQuanzhou Normal UniversityQuanzhou 362000China

We design a four-band terahertz metamaterial absorber that relied on the block Dirac semi-metal(BDS).It is composed of a Dirac material layer,a gold reflecting layer,and a photonic crystal slab(PCS)medium *** structure achieved perfect absorption of over 97%at 4.06 THz,6.15 THz,and 8.16 *** high absorption can be explained by the localized surface plasmon resonance(LSPR).And this conclusion can be proved by the detailed design of the surface ***,the resonant frequency of the device can be dynamically tuned by changing the Fermi energy of the *** to the advantages such as high absorption,adjustable resonance,and anti-interference of incident angle and polarization mode,the Dirac semi-metal perfect absorber(DSPA)has great potential value in fields such as biochemical sensing,information communication,and nondestructive detection.

关键词： metamaterials terahertz block Dirac semi-metal localized surface plasmon resonance

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A novel plasmonic refractive index sensor based on gold/silicon complementary grating structure

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Chinese Physics B 2021年第2期30卷 313-318页

作者： Xiangxian Wang Jiankai Zhu Yueqi Xu Yunping Qi Liping Zhang Hua Yang zao yi School of Science Lanzhou University of TechnologyLanzhou 730050China College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China

A novel complementary grating structure is proposed for plasmonic refractive index sensing due to its strong resonance at near-infrared *** reflection spectra and the electric field distributions are obtained via the finite-difference time-domain *** simulation results show that multiple surface plasmon resonance modes can be excited in this novel ***,one of the resonance modes shows appreciable potential in refractive index sensing due to its wide range of action with the environment of the *** optimizing the grating geometric variables of the structure,the designed structure shows the stable sensing performance with a high refractive index sensitivity of 1642 nm per refractive index unit(nm/RIU)and the figure of merit of 409 RIU^(-1).The promising simulation results indicate that such a sensor has a broad application prospect in biochemistry.

关键词： plasmonic sensor gold silicon grating

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