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Influence of N-doping on dielectric properties of carbon-coated copper nanocomposites in the microwave and terahertz ranges

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Journal of Materiomics 2022年第6期8卷 1131-1140页

作者： Feirong Huang shuting fan Yuqi Tian Xinghao Qu Xiyang Li Maofan Qin Javid Muhammad Xuefeng Zhang Zhidong Zhang Xinglong Dong Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian116024China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen518060China Institute of Advanced Magnetic Materials College of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110015China

Carbon-coated Cu nanocomposites (Cu@C NCs) consisting of core-shell nanoparticles and nanorods weresynthesized by arc discharge plasma under an atmosphere of He and H_(2) gas, and the N-doping of themwas achieved by a post-treatment process using ureal as the precursor. The concentration of N in the Ndoped samples varies in the range of 0.62%-2.31 % (in mole), with a transformation from pyrrolic N tographitic N when increasing the relative content of ureal. Dielectric properties of the NCs without or withN-doping in the microwave and THz bands were investigated. The N-doped samples achieve theenhanced dielectric loss in both microwave and THz bands. In the microwave band, dielectric loss wasdominated by interfacial polarization, dipolar polarization, and conduction loss, while in the THz band,plasma resonance, ionic polarization and conduction loss are responsible for the dielectric loss, with astrong absorption characteristic dominated by conductive effect.

关键词： Cu/C nanocomposite Dielectric property N-doping Terahertz frequency

Terahertz topological photonic waveguide switch for on-chip communication

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Photonics Research 2022年第4期10卷 1090-1096页

作者： Xudong Liu Jialiang Huang Hao Chen Zhengfang Qian JlNGWEN Ma Xiankai Sun shuting fan Yiwen Sun Department of Biomedical Engineering School of MedicineShenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronics EngineeringShenzhen UniversityShenzhen 518060China Department of Electronic Engineering The Chinese University of Hong KongHong KongChina

Terahertz(THz)topological photonic structures are promising for last-centimeter communication in intra/interchip communication systems because they support bit-error-free THz signal transmission with topological *** and dynamically tunable THz topological photonic components have not yet been experimentally ***,we experimentally demonstrate a THz topological switch(270-290 GHz)based on a valley Hall photonic crystal structured high-resistivity silicon substrate,in which the THz waves can be dynamically turned on/off by an external 447 nm continuous-wave *** device exhibited an on/off ratio of 19 dB under a pumping light intensity of 240 mW/mm^(2).The 3 dB switching bandwidth was〜60 kHz.

关键词： communication waveguide tunable

Influence of Ti_(3)C_(2)T_(x)(MXene)on the generation of dielectric barrier discharge in air

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Plasma Science and Technology 2021年第11期23卷 66-73页

作者： Weisheng CUI Qiaolu LIN Hongbo LI Shuai ZHAO Yunge ZHANG Yifan HUANG shuting fan Yiling SUN Zhengfang QIAN Renheng WANG Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People's Republic of China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094People's Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055People's Republic of China

The formation of homogeneous dielectric barrier discharge(DBD)in air is a key scientific problem and core technical problem to be solved for the application of ***,we report the effect of two-dimensional(2D)nanomaterial Ti_(3)C_(2)T_(x)(Tx=-F,-O and/or-OH)on regulating the electrical discharge *** field emission and weak bound state property of Ti_(3)C_(2)T_(x)can effectively increase the seed electrons and contribute to the generation of atmospheric pressure homogeneous air *** electron avalanche development for the uneven electrode structure is calculated,and the discharge mode transition is *** comparative analyses of discharge phenomena validate the regulation of Ti_(3)C_(2)T_(x)on the discharge characteristics of *** light emission capture and the voltage and current waveforms verify that the transition of Townsend discharge to streamer discharge is effectively *** optical emission spectra are used to characterize the plasma and confirm that it is in a non-equilibrium state and the gas temperature is at room *** is the first exploration of Ti_(3)C_(2)T_(x)on the regulation of electrical discharge characteristics as far as we *** work proves the feasibility of Ti_(3)C_(2)T_(x)as a source of seed electrons to form homogeneous DBD,establishing a preliminary foundation for promoting the application of atmospheric pressure non-equilibrium plasma.

关键词： atmospheric pressure air plasma Townsend discharge seed electron Ti_(3)C_(2)T_(x)

Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial

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Microsystems & Nanoengineering 2017年第1期3卷 169-174页

作者： Mingkai Liu Mohamad Susli Dilusha Silva Gino Putrino Hemendra Kala shuting fan Michael Cole Lorenzo Faraone Vincent P.Wallace Willie J.Padilla David A.Powell Ilya V.Shadrivov Mariusz Martyniuk Nonlinear Physics Centre Research School of Physics and EngineeringAustralian National UniversityCanberraACT 2601Australia School of Electrical Electronic and Computer Engineeringthe University of Western AustraliaCrawleyWA 6009Australia School of Physics University of Western AustraliaCrawleyWA 6009Australia Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA

The realization of high-performance tunable absorbers for terahertz frequencies is crucial for advancing applications such as single-pixel imaging and *** on the strong position sensitivity of metamaterials’electromagnetic response,we combine meta-atoms that support strongly localized modes with suspended flat membranes that can be driven *** design maximizes the tunability range for small mechanical displacements of the *** employ a micro-electromechanical system technology and successfully fabricate the *** prototype devices are among the best-performing tunable THz absorbers demonstrated to date,with an ultrathin device thickness(~1/50 of the working wavelength),absorption varying between 60%and 80%in the initial state when the membranes remain suspended,and fast switching speed(~27μs).The absorption is tuned by an applied voltage,with the most marked results achieved when the structure reaches the snap-down *** this case,the resonance shifts by >200% of the linewidth(14% of the initial resonance frequency),and the absolute absorption modulation measured at the initial resonance can reach 65%.The demonstrated approach can be further optimized and extended to benefit numerous applications in THz technology.

关键词： absorber metamaterials micro-electro-mechanical system terahertz tunable device

不同定子绕组结构五相感应电机开路故障时性能对比分析

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电工技术学报 2022年第7期37卷 1679-1688页

作者：范舒婷孟大伟艾萌萌哈尔滨理工大学电气与电子工程学院哈尔滨150080

为研究不同绕组结构对五相电机的影响,在现行单绕组及星形-五边形组合绕组的基础上,该文提出三种新型组合绕组:五边形-星形绕组、五角星-星形绕组与星形-五角星绕组。首先,建立绕组磁动势模型与电压不平衡系数(VUF)计算模型,利用有限元... 详细信息

为研究不同绕组结构对五相电机的影响,在现行单绕组及星形-五边形组合绕组的基础上,该文提出三种新型组合绕组:五边形-星形绕组、五角星-星形绕组与星形-五角星绕组。首先,建立绕组磁动势模型与电压不平衡系数(VUF)计算模型,利用有限元方法计算电机绕组磁动势(MMF)谐波含量、电压不平衡系数。其次,制作15kW五相感应电机,并以此为样机对不同绕组结构五相感应电机开路故障下的稳态性能进行分析。仿真及实验结果表明,对于单绕组结构,开路状态下五边形绕组最有利于电机运行;而对于组合式绕组,该文提出的五边形-星形绕组相比于现行的星形-五边形绕组,既有磁动势谐波含量低的优点,又可以进一步减小电压不平衡系数,提高可带负载转矩,更有利于电机在开路情况下运行。

关键词：五相电机组合绕组开路故障最大转矩倍数电压不平衡系数

Real‑time detection of aging status of methylammonium lead iodide perovskite thin flms by using terahertz time‑domain spectroscopy

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Frontiers of Optoelectronics 2024年第3期17卷 39-50页

作者： Jinzhuo Xu Yinghui Wu shuting fan Xudong Liu Zhen Yin Youpeng Yang Renheng Wang Zhengfang Qian Yiwen Sun Department of Biomedical Engineering School of MedicineShenzhen UniversityShenzhen 518060China Guangdong Provincial Key Laboratory of Durability for Ocean Civil Engineering College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

The inadequate stability of organic–inorganic hybrid perovskites remains a signifcant barrier to their widespread commercial application in optoelectronic *** phenomena profoundly afect the optoelectronic performance of perovskite-based *** addition to enhancing perovskite stability,the real-time detection of aging status,aimed at monitoring the aging progression,holds paramount importance for both fundamental research and the commercialization of organic–inorganic hybrid *** this study,the aging status of perovskite was real-time investigated by using terahertz time-domain *** analysis consistently revealed a gradual decline in the intensity of the absorption peak at 0.968 THz with increasing perovskite ***,a systematic discussion was conducted on the variations in intensity and position of the terahertz absorption peaks as the perovskite *** fndings facilitate the real-time assessment of perovskite aging,providing a promising method to expedite the commercialization of perovskite-based optoelectronic devices.

关键词： Perovskite Terahertz spectroscopy Ageing Real-time detection

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太赫兹与水的相互作用:机理、应用和新趋势

深圳大学学报（理工版） 2019年第2期36卷 200-206页

作者：范姝婷马莹玉舒国响钱正芳深圳大学物理与光电工程学院广东深圳518060 深圳大学电子与信息工程学院广东深圳518060

自21世纪以来,太赫兹技术因受到世界各国的重视和扶持而取得迅猛发展.介绍液态水分子网络在太赫兹波段的振动和弛豫模式,以及太赫兹波与水分子之间相互作用的原理.评述基于此机理太赫兹在生物医学,尤其是关于癌症检测领域的发展与挑战,... 详细信息

自21世纪以来,太赫兹技术因受到世界各国的重视和扶持而取得迅猛发展.介绍液态水分子网络在太赫兹波段的振动和弛豫模式,以及太赫兹波与水分子之间相互作用的原理.评述基于此机理太赫兹在生物医学,尤其是关于癌症检测领域的发展与挑战,介绍了本课题组目前开展的工作.展望围绕太赫兹波与水相互作用产生的新研究与新技术.

关键词：电磁波物理太赫兹太赫兹时域光谱太赫兹成像生物医学应用癌症检测水分子网络