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Electron dynamics of active mode-locking terahertz quantum cascade laser

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Chinese Physics B 2020年第12期29卷 438-441页

作者： Qiushi Hou Chang Wang juncheng cao Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The pulse generation from active mode-locking terahertz quantum cascade laser is studied by Maxwell-Bloch *** is shown that longer dephasing time will lead to multiple pulses generation from the *** dependence of output field on modulation length and radio-frequency parameters is *** order to achieve short pulse generation,the DC bias should close to threshold value and modulation length should be shorter than 0.256 *** output pulse is unstable and the envelope shows many oscillations in the presence of spatial hole burning,resulting destabilization of mode-locking.

关键词： terahertz(THz) quantum cascade lasers(QCLs) mode-locking spatial hole burning(SHB)

4.3 THz quantum-well photodetectors with high detection sensitivity

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Chinese Physics B 2018年第3期27卷 201-204页

作者： Zhenzhen Zhang Zhanglong FU Xuguang Guo juncheng cao Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Ministry of Education and Shanghai Key Laboratory of Modern Optical System and Shanghai Terahertz Research Center.University of Shanghai for Science and Technology Shanghai 200093China University of Chinese Academy of Sciences Beijing 100049China

We demonstrate a high performance GaAs/AlGaAs-based quantum-well photodetector(QWP)device with a peak response frequency of 4.3 *** negative differential resistance(NDR)phenomenon is found in the dark currentvoltage(I-V)curve in the current sweeping measurement mode,from which the breakdown voltage is *** photocurrent spectra and blackbody current responsivities at different voltages are *** on the experimental data,the peak responsivity of 0.3 A/W(at 0.15 V,8 K)is derived,and the detection sensitivity is higher than 10^(11)Jones,which is in the similar level as that of the commercialized liquid-helium-cooled silicon *** attribute the high detection performance of the device to the small ohmic contact resistance of-2Ωand the big breakdown bias.

关键词： terahertz quantum-well photodetector negative differential resistance detection sensitivity pho-tocurrent spectra

Symmetry-broken silicon disk array as an efficient terahertz switch working with ultra-low optical pump power

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Chinese Physics B 2020年第8期29卷 72-77页

作者： Zhanghua Han Hui Jiang Zhiyong Tan juncheng cao Yangjian Cai Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystems and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The advancement of terahertz technology in recent years and its applications in various fields lead to an urgent need for functional terahertz components,among which a terahertz switch is one example of the most importance because it provides an effective interface between terahertz signals and information in another physical *** date many types of terahertz switches have been investigated mainly in the form of metamaterials made from metallic structures and optically-active ***,these reported terahertz switches usually suffer from an inferior performance,e.g.,requiring a high pump laser power density due to a low quality factor of the metallic metamaterial *** this paper,we report and numerically investigate a symmetry-broken silicon disk based terahertz resonator array which exhibits one resonance with ultrahigh quality factor for normal incidence of the terahertz *** resonance,which can never be excited for regular circular Si disks,can help to realize a superior terahertz switch with which only an ultra-low optical pump power density is required to modify the free carrier concentration in Si and its refractive index in the terahertz *** findings demonstrate that to realize a high terahertz transmittance change from 0 to above 50%,the required optical pump power density is more than 3 orders of magnitude smaller than that required for a split-ring resonator(SRR)based terahertz switch reported in the literature.

关键词： silicon disk symmetry-broken terahertz switch photocarrier bound state in continuum

基于狄拉克半金属超表面的太赫兹调制技术研究

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功能材料与器件学报 2024年第2期 84-88页

作者：杨祉烜王长谭智勇曹俊诚上海科技大学信息学院上海201210 中国科学院上海微系统与信息技术研究所集成电路材料全国重点实验室上海200050

本文设计了一种非对称双开口环超表面结构的狄拉克半金属太赫兹谐振器,并研究分析了结构参数与费米能级对共振幅度的影响。研究结果表明,随着对称缺损程度的增加,谐振器的共振峰逐渐红移,共振幅度呈现先增加再减少的趋势。随着狄拉克半... 详细信息

本文设计了一种非对称双开口环超表面结构的狄拉克半金属太赫兹谐振器,并研究分析了结构参数与费米能级对共振幅度的影响。研究结果表明,随着对称缺损程度的增加,谐振器的共振峰逐渐红移,共振幅度呈现先增加再减少的趋势。随着狄拉克半金属材料费米能级的增加,谐振器的共振峰幅值增加。当费米能级在40-200meV时范围变化时,在0.38 THz附近实现了99.4%的幅值调制深度,在太赫兹波调控方面有很好的应用价值。

关键词：狄拉克半金属超表面连续域束缚态太赫兹调制技术

Multidimensional hollow SiO_(2)/C nanofibers modified by magnetic nanocrystals for electromagnetic energy conversion and lithium battery storage

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Nano Research 2024年第8期17卷 7301-7314页

作者： Chen Han Qi Zheng juncheng Jin Jiajia Zhang Wen-Qiang cao Kun Xiang Min Zhang Mao-Sheng cao Anhui Provincial Laboratory of Biomimetic Sensor and Detecting Technology College of Materials and Chemical EngineeringWest Anhui UniversityLu’an 237012China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of Physics Beijing Technology and Business UniversityBeijing 100048China

Multifunctional materials are powerful tools to support the advancement of energy conversion *** with prominent electromagnetic and electrochemical properties can realize the conversion of electromagnetic energy and solve the subsequent storage ***,an electrospinning-thermal reduction method is employed to construct ultrafine nickel nanoparticle modified porous SiO_(2)/C(Ni-SiO_(2)/C)hollow nanofibers as promising materials for applications in both electromagnetic wave absorption(EMA)and lithium-ion ***,when used as an EMA material,the reflection loss(RL)of Ni-SiO_(2)/C can reach−47.8 dB at 15.8 GHz with a matching thickness of 2.2 *** excellent microwave absorption performance can be attributed to the enhanced conduction loss,polarization relaxation,synergistic magnetic loss,and preferred impedance matching,which result from multi-component magnetic/dielectric synergy and the unique interconnected multidimensional hollow ***,the electronic conductivity and electrochemical activity of the samples are significantly enhanced due to the uniform distribution of ultrafine Ni nanoparticles in the amorphous SiO_(2)/C ***,the hierarchical hollow porous structure provides sufficient free space for volume change during lithiation/delithiation ***,the Ni-SiO_(2)/C nanocomposite exhibits a high reversible capacity of 917.6 mAh·g^(−1)at 0.1 A·g^(−1).At a high current density of 2 A·g^(−1),a capacity of 563.9 mAh·g^(−1)can be maintained after 300 *** energy conversion-storage device is designed to store waste electromagnetic energy in the form of useful electrical *** work inspires the development of high-performance bifunctional materials.

关键词： Ni-SiO_(2)/C nanofiber electromagnetic absorption lithium-ion storage electrospinning multidimensional structure

Terahertz Direct Modulation Techniques for High-speed Communication Systems

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China Communications 2021年第5期18卷 221-244页

作者： Tianchi Zhou Yaxin Zhang Bo Zhang Hongxin Zeng Zhiyong Tan Xilin Zhang Lan Wang Zhi Chen juncheng cao Kaijun Song Ziqiang Yang University of Electronic Science and Technology of China ChengduChina Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China Key Laboratory of Terahertz Solid State Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences865 Changning RoadShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Terahertz communication technology can provide abundant frequency resources,strong confidentiality,antijamming capability,communication tracking capability and the ability to achieve highspeed data transmissions and can serve as an important technical method for high-speed communications in the *** these terahertz communication technologies,terahertz direct modulation technology is a key means to achieve low system complexity and power *** this paper,a review and outlook of terahertz direct modulation technology are proposed from the aspects of high-electron-mobilitytransistor-based terahertz direct modulation,parallelswitch terahertz direct modulation,diode-based terahertz direct modulation,quantum cascade laser-based terahertz direct modulation and new-material-based terahertz direct *** hope through this paper that more readers can gain knowledge about the development and challenges of terahertz direct modulation technology for high-speed communication systems,thus promoting the development of high-speed terahertz communication technology based on direct modulation.

关键词： THz communication THz direct modulation HEMT switches diode QCL new-material

Research progress in terahertz quantum cascade lasers

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Science China(Information Sciences) 2012年第1期55卷 16-26页

作者： cao juncheng Key Laboratory of Terahertz Solid-State Technology,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China 1. Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

The terahertz(THz)quantum cascade laser(QCL)is a coherent THz source based on intersubband transitions of unipolar *** semiconductor lasers,THz QCLs are solid-state,electrically pumped,tunable,and can be easily *** paper reviews the state of the art for the design,operation temperature,and output power of THz *** applications in THz communication and imaging are also discussed.

关键词： terahertz quantum cascade laser communication imaging

Optical strong coupling in hybrid metal-graphene metamaterial for terahertz sensing

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Chinese Physics B 2021年第11期30卷 661-665页

作者： Ling Xu Yun Shen Liangliang Gu Yin Li Xiaohua Deng Zhifu Wei Jianwei Xu juncheng cao Department of Physics Nanchang UniversityNanchang 330031China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Institute of Space Science and Technology Nanchang UniversityNanchang 330031China Shanghai Institute of Microsystem and Information Chinese Academy of SciencesShanghai 200050China

We propose a terahertz hybrid metamaterial composed of subwavelength metallic slits and graphene plasmonic ribbons for sensing *** special design can cause the interaction between the plasmon resonances of the metallic slits and graphene ribbons,giving rise to a strong coupling effect and Rabi *** balancing in the strong coupling region can be perturbed by the carrier concentration of graphene,which is subject to the analyte on its ***,the detection of analyte can be reflected as a frequency shift of resonance in terahertz transmission *** result shows that this sensor can achieve a theoretical detection limit of 325 electrons or holes per square ***,it also works well as a refractive index sensor with the frequency sensitivity of 485 GHz/*** results may contribute to design of ultra-micro terahertz sensors.

关键词： metamaterial terahertz strong coupling sensor

A reflecting-type highly efficient terahertz cross-polarization converter based on metamaterials

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Chinese Optics Letters 2019年第9期17卷 101-104页

作者： Xiaoqing Luo Zhiyong Tan Chang Wang juncheng cao Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

We propose and experimentally demonstrate a wideband linear polarization converter in a reflection mode operating from 2.4 to 4.2 THz with conversion efficiency of more than 80%. Our device can expand the applications to a higher frequency band. A numerical simulation is performed for this metamaterial converter, which shows a good agreement with experimental results. Importantly, a concise and intuitive calculating model is proposed for the Fabry–Pérot cavity. The theoretical results indicate that the underlying reason for the enhanced polarization conversion is the additional phase difference induced by the resonance of the meta-structure and multiple reflections within the Fabry–Pérot cavity.

关键词： reflecting-type highly efficient terahertz cross-polarization converter metamaterials