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Graphene-metasurface for wide-incident-angle terahertz absorption Research

Ri-hui Xiong, Xiao-qing Peng, Jiu-sheng Li,lijsh2008@126.com

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3,   Pages 287-436 doi: 10.1631/FITEE.2000079

Abstract: We demonstrate a structure for tunable wide-incident-angle terahertz wave absorption, which involves depositing planar arrays of on a silicon dioxide substrate. We also discuss how the graphene Fermi-level layer and various substrates affect the absorption characteristics. The absorption of the proposed is above 80% at an incident angle of 0°–60° in frequencies ranging from 0.82 to 2.0 THz. Our results will be very beneficial in the application of terahertz wave communications and biomedical imaging/sensing systems.

Keywords： 石墨烯超表面；太赫兹吸收器；欧米伽形石墨烯图案    

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Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film Article

Zhengang Lu, Yilei Zhang, Heyan Wang, Chao Xia, Yunfei Liu, Shuliang Dou, Yao Li, Jiubin Tan

Engineering 2023, Volume 29, Issue 10,   Pages 198-206 doi: 10.1016/j.eng.2022.10.005

Abstract:

Transparent microwave absorbers that exhibit high optical transmittance and microwave absorption capability are ideal, although having a fixed absorption performance limits their applicability. Here, a simple, transparent, and thermally tunable microwave absorber is proposed, based on a patterned vanadium dioxide (VO2) film. Numerical calculations and experiments demonstrate that the proposed VO2 absorber has a high optical transmittance of 84.9% at 620 nm; its reflection loss at 15.06 GHz can be thermally tuned from –4.257 to –60.179 dB, and near-unity absorption is achieved at 523.75 K. Adjusting only the patterned VO2 film duty cycle can change the temperature of near-unity absorption. Our VO2 absorber has a simple composition, a high optical transmittance, a thermally tunable microwave absorption performance, a large modulation depth, and an adjustable temperature tuning range, making it promising for application in tunable sensors, thermal emitters, modulators, thermal imaging, bolometers, and photovoltaic devices.

Keywords： Tunable microwave absorber     VO2 film     Optical transparent     Near unity absorption     Large modulation depth    

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From Terahertz Imaging to Terahertz Wireless Communications Review

Yi Huang,Yaochun Shen,Jiayou Wang

Engineering 2023, Volume 22, Issue 3,   Pages 106-124 doi: 10.1016/j.eng.2022.06.023

Abstract:

Terahertz (THz) technology is probably best known to the public as a powerful tool for imaging, since it has been applied in security and medical scanning, resulting in numerous impressive images that would be unobtainable using other technologies. With the roll-out of 5G mobile networks, research into 6G wireless communications is heating up. It is envisioned that THz technology will be used for 6G and future wireless communications. In this paper, we review how THz technology has been employed for imaging and wireless communications, identify state-of-the-art developments in the field, and then examine and compare common devices and issues in both applications. The possibility of integrating THz imaging/sensing and wireless communications is considered, and challenges and future perspectives are presented and discussed. It is shown that THz technology is indeed a key enabling technology for both imaging and wireless communications in the future.

Keywords： Communications     Imaging     Terahertz technology     Wireless communications    

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A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands Research Articles

Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 8,   Pages 1104-1113 doi: 10.1631/FITEE.2000229

Abstract: This paper presents a study of s in submillimeter and terahertz bands. To show the necessity of improving the mechanical properties of the coupler’s branch in submillimeter and terahertz bands, a comprehensive study regarding the displacement of hybrid branch variation with varying width-length ratio and height-length ratio has been completed. In addition, a modified is designed and presented. Compared with the traditional branch structure, the proposed hybrid consists of a modified middle branch with circular cutouts at the top and bottom on both sides instead of the traditional rectangle branch, which increases the branch size and improves its while achieving the same performance. Simulation results show that the deformation of the modified hybrid branch is 22% less than those of other traditional structure designs under the same stress. In practice, a vibration experiment is set up to verify the of hybrid couplers. Measurement results show that the experiment deteriorates the coupling performance. Experimental results verify that the performance of the novel structure coupler is better than that of a traditional structure branch hybrid coupler under the same electrical properties.

Keywords： 定向耦合器；3-dB分支波导定向耦合器；亚毫米波器件；太赫兹电路；机械可靠性    

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A high-precision terahertz retrodirective antenna array with navigation signal at a different frequency Correspondence

Zhong-bo ZHU, Wei-dong HU, Tao QIN, Sheng LI, Xiao-jun LI, Jiang-jie ZENG, Xian-qi LIN, Leo P. LIGTHART

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 3,   Pages 377-383 doi: 10.1631/FITEE.1900581

Abstract: Future communications will provide higher transmission rates and higher operating frequencies. In addition, agile beam tracking will be an inevitable trend in technology development. The terahertz retrodirective antenna array proposed and discussed in this paper can be a better solution for agile beam tracking. The array receives a 40-GHz navigation signal and accurately retransmits a 120-GHz beam in the direction of the arrival wave. Simulation results indicate that the proposed array with a stacked sandwich structure has realized the tracking of the received wave. The scanning radiation pattern shows that the array gain is 23.87 dB at 19.9° when the incident angle is 20° with a relative error of only 0.5%, meaning that there is a lateral error of only 8.7 m at a transmission distance of 5 km.

Keywords： Terahertz     Retrodirective antenna array     Terahertz communications     Conjugate mixing    

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Frequency–angle two-dimensional reflection coefficient modeling based on terahertz channel measurement Correspondence

Zhaowei CHANG, Jianhua ZHANG, Pan TANG, Lei TIAN, Li YU, Guangyi LIU, Liang XIA,changzw12345@bupt.edu.cn,jhzhang@bupt.edu.cn

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 4,   Pages 626-632 doi: 10.1631/FITEE.2200290

Abstract: Terahertz (THz) channel propagation characteristics are vital for the design, evaluation, and optimization of THz communication systems. Moreover, reflection plays a significant role in channel propagation. In this correspondence, the reflection coefficients of the THz channel are researched based on extensive measurement campaigns. First, we set up the THz channel sounder from 220 to 320 GHz at incident angles ranging from 10◦ to 80◦. Based on the measured propagation loss, the reflection coefficients of five building materials, i.e., glass, tile, board, plasterboard, and aluminum alloy are calculated separately for frequencies and incident angles. It is found that the lack of THz-relative parameters leads to an inability to successfully fit the Fresnel model of nonmetallic materials to the measurement data. Thus, we propose a frequency–angle two-dimensional reflection coefficient (FARC) model by modifying the Fresnel model with the Lorenz and Drude models. The proposed model characterizes the frequency and incident angle for reflection coefficients and shows low root-mean-square error (RMSE) with the measurement data. Generally, these results are useful for modeling THz channels.

Keywords： 太赫兹通信；反射系数建模；入射角；建筑材料；菲涅耳模型    

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Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review Special Feature on Precision Measurement and Instr

Lin CHEN, Deng-gao LIAO, Xu-guang GUO, Jia-yu ZHAO, Yi-ming ZHU, Song-lin ZHUANG

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 5,   Pages 591-607 doi: 10.1631/FITEE.1800633

Abstract:

We give a brief review of the developments in terahertz time-domain spectroscopy (THz-TDS) systems and microcavity components for probing samples in the University of Shanghai for Science and Technology. The broadband terahertz (THz) radiation sources based on GaAs m-i-n diodes have been investigated by applying high electric fields. Then, the free space THz-TDS and fiber-coupled THz-TDS systems produced in our lab and their applications in drug/cancer detection are introduced in detail. To further improve the signal-to-noise ratio (SNR) and enhance sensitivity, we introduce three general micro-cavity approaches to achieve tiny-volume sample detection, summarizing our previous results about their characteristics, performance, and potential applications.

Keywords： Terahertz (THz) time-domain spectroscopy     Micro-cavity     Metal holes array     Waveguide cavities     Spoof localized surface plasmons (LSPs)    

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cattering-absorbing method for the detection of 16.7 MeV high-energy pulsed gamma

Tan Xinjian,Ouyang Xiaoping,Wang Qunshu

Strategic Study of CAE 2009, Volume 11, Issue 8,   Pages 48-51

Abstract:

This paper proposes a new method of diagnosing 16.7 MeV high-energy pulsed gamma, named "scattering-absorbing method" . The ratio of the sensitivity of HEG to that of the LEG can reach 106 to 108 by this new method. The sensitivity of 16.7 MeV high-energy gamma ranges from 10-21 to 10-16 C·cm2. It's better than the traditional method which bases on the magnetic analyzer and Cherenkov detector on some aspects.

Keywords： high-energy gamma     Cherenkov detector     scattering absorption method    

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Passive mode-locked Er-doped fiber laser pulse generation based on titanium disulfide saturable absorber Research Articles

Xinxin Shang, Linguang Guo, Huanian Zhang, Dengwang Li, Qingyang Yue,huanian_zhang@163.com,qingyangyue@sdnu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 5,   Pages 615-766 doi: 10.1631/FITEE.2000341

Abstract: In this study, (TiS) polyvinyl alcohol (PVA) film-type (SA) is synthesized with a modulation depth of 5.08% and a saturable intensity of 10.62 MW/cm by liquid-phase exfoliation and spin-coating methods. Since TiS-based SA has a strong nonlinear saturable absorption property, two types of optical soliton were observed in a mode-locked Er-doped . When the pump power was raised to 67.3 mW, a conventional mode-locked pulse train with a repetition rate of 1.716 MHz and a pulse width of 6.57 ps was generated, and the output spectrum centered at 1556.98 nm and 0.466 nm spectral width with obvious Kelly sidebands was obtained. Another type of mode-locked pulse train with the maximum output power of 3.92 mW and pulse energy of 2.28 nJ at the pump power of 517.2 mW was achieved when the polarization controllers were adjusted. Since TiS-based SA has excellent nonlinear saturable absorption characteristics, broad applications in ultrafast photonic are expected.

Keywords： 光纤激光器；被动锁模；可饱和吸收体；二硫化钛    

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Development Strategy of Free Electron Laser Technology in China

Li Peng, Li Ming, Wu Dai, Zhou Zheng, Tang Chun

Strategic Study of CAE 2020, Volume 22, Issue 3,   Pages 35-41 doi: 10.15302/J-SSCAE-2020.03.006

Abstract:

Free electron laser (FEL) is a large-scale scientific research device based on electron linear accelerator and has been widely used in basic scientific research such as condensed matter physics, advanced materials and surface physics, atomic and molecular physics, chemistry, and biology. The advancement of FEL technology will promote the light sources to develop towards higher power and shorter wavelength to satisfy the increasing demands of users. This study introduces the necessity of development based on the characteristics of the FEL technology and summarizes the current development status of the technology in China and abroad. It also analyzes the existing problems in its development in China and proposes ideas and goals for the development of FEL technology in China. By 2035, China should focus on making breakthroughs in long-wave FEL, X-ray FEL, new FEL, and FEL-based extreme ultraviolet (EUV) lithography light source technologies. Based on the research and analysis, this study proposes some suggestions for the steady and healthy development of the FEL technology in China, including making scientific development strategies, raising investment in fundamental research to promote independent innovation, strengthening multi-party cooperation to promote the transformation of scientific and technological achievements, promoting market application, and strengthening personnel training.

Keywords： free electron laser     infrared-terabertz FEL     extreme ultraviolet-FEL     X-ray FEL    

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Channelmeasurements and models for 6G: current status and future outlook Review Articles

Jian-hua ZHANG, Pan TANG, Li YU, Tao JIANG, Lei TIAN

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1,   Pages 39-61 doi: 10.1631/FITEE.1900450

Abstract: With the commercialization of fifth generation networks worldwide, research into sixth generation (6G) networks has been launched to meet the demands for high data rates and low latency for future services. A wireless propagation channel is the transmission medium to transfer information between the transmitter and the receiver. Moreover, channel properties determine the ultimate performance limit of wireless communication systems. Thus, conducting channel research is a prerequisite to designing 6G wireless communication systems. In this paper, we first introduce several emerging technologies and applications for 6G, such as terahertz communication, industrial Internet of Things, space-air-ground integrated network, and machine learning, and point out the developing trends of 6G channel models. Then, we give a review of channel measurements and models for the technologies and applications. Finally, the outlook for 6G channel measurements and models is discussed.

Keywords： Channel measurements     Channel models     Sixth generation     Terahertz     Industrial Internet of Things     Space-air-ground integrated network     Machine learning    

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Standardization of 6G Key Technologies: Thoughts and Suggestions

Luo Yan, Quan Wei, Zhang Hongke

Strategic Study of CAE 2023, Volume 25, Issue 6,   Pages 18-26 doi: 10.15302/J-SSCAE-2023.06.003

Abstract:

Research on the sixth-generation mobile communication (6G) technology starts gradually after the commercialization of the fifth-generation mobile communication (5G) technology, thus to support the development of digital economy and the construction of digital infrastructure. Countries worldwide are now competing for the establishment of 6G standards. This study reviews the development status of 6G standards from the aspects of 6G technology development in major developed countries and regions, international cooperation in 6G standards development, and 6G technology development in China. Moreover, it explores the integrated application and standardization progresses of 6G technology, involving the standardization of computing power networks, blockchain, digital twins, artificial intelligence, and holographic communications. China can make plans in advance for the standardization of 6G key technologies, focusing on terahertz, smart metasurface, smart holographic radio, super-large-scale MIMO, and communicationsperception integration technologies. Furthermore, the following suggestions are proposed: (1) strengthening the independent innovation of 6G key technologies to promote the independent development of 6G basic industries; (2) accelerating cross-industry cooperation and innovation to establish the standards system for 6G key technologies; and (3) deepening international cooperation on 6G technologies to help create an open and win-win global industrial ecology.

Keywords： 6G     standards establishment     terahertz     computing power network     communications and perception integration    

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Novel X-ray and Optical Diagnostics for Studying Energetic Materials: A Review Review

Yiyang Zhang, Sen Chen, Yang Cai, Lei Lu, Duan Fan, Jinchun Shi, Junyu Huang, Sheng-Nian Luo

Engineering 2020, Volume 6, Issue 9,   Pages 992-1005 doi: 10.1016/j.eng.2020.06.019

Abstract:

Thermomechanical, physical, and chemical processes in energetic materials (EMs) during manufacturing and processing or under external stimuli such as shock compression, involve multiple temporal and spatial scales. Discovering novel phenomena, acquiring new data, and understanding underlying mechanisms all require temporally and spatially resolved diagnostics. Here, we present a brief review of novel diagnostics that are either emerging or have existed but rarely been applied to EMs, including two-dimensional (2D) and three-dimensional (3D) X-ray imaging, X-ray diffraction, coherent X-ray diffraction imaging, small angle X-ray scattering, terahertz and optical absorption/emission spectroscopy, and one-dimensional (1D) and 2D laser-based velocity/displacement interferometry. Typical spatial scales involved are lattice (nanometer and micrometer) and typical temporal scales (femtosecond, picosecond, nanosecond, microsecond, and millisecond). The targeted scientific questions and engineering problems include defects, strengths, deformations, hot spots, phase changes, reactions, and shock sensitivities. Basic principles of measurement and data analysis, and illustrative examples of these are presented. Advanced measurements and experimental complexities also necessitate further development in corresponding data analysis and interpretation methodologies, and multiscale modeling

Keywords： Energetic materials     X-ray     Terahertz and optical diagnostics     Multiscale measurements    

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The progress of membrane adsorption and absorption

Lin Ligang,Ye Hui,Zhao Lizhi,Ding Xiaoli,Zhang Yuzhong

Strategic Study of CAE 2014, Volume 16, Issue 12,   Pages 59-66

Abstract:

During recent years， membrane integration process has attracted wide attentions. The study on combination of the traditional separation technology and membrane process is conducive to the advantages such as high efficiency， easy online， etc. It is significant for the large-scale application of membrane integration process with low cost. Membrane adsorption and membrane absorption processes， which combined the advantages of membranes with adsorption， gained wide?applications for numerous occasions such as purification and separation. The research advances and development tendency of membrane adsorption and absorption will be introduced in this article， which can provide some suggestions for the researchers of related fields.

Keywords： membrane     membrane adsorption     membrane absorption    

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Traditional soliton erbium-doped fiber laser with InSe as saturable absorber Research

Xiaojuan Liu, Guomei Wang, Mingxiao Zhu, Kezhen Han, Wenfei Zhang, Huanian Zhang,zhangwenfei@sdut.edu.cn,huanian_zhang@163.com

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3,   Pages 287-436 doi: 10.1631/FITEE.2000387

Abstract: Indium selenide (InSe) is a typical layered metal-chalcogenide semiconductor that has potential for developing ultrafast optoelectronic devices. In this work, InSe-polyvinyl alcohol (InSe-PVA) film is employed as saturable absorber and prepared by mixing InSe solution and polyvinyl alcohol solution. The nonlinear absorption properties of the InSe saturable absorber (InSe-SA) are investigated, showing that the nonsaturable absorption and modulation depth are 37.5% and 9.55%, respectively. lasers are generated in erbium-doped fiber (EDF) laser-employed InSe as a mode-locker. The central wavelength and pulse duration of the pulse are 1568.73 nm and 2.06 ps, respectively, under a repetition rate of 1.731 MHz. The maximum average output power is 16.4 mW at the pump power of 413 mW. To the best of our knowledge, this is the first demonstration of a pulse with InSe as a mode-locker. The experimental results further demonstrate that InSe is an outstanding nonlinear absorption material in ultrafast .

Keywords： 光纤激光器；纳米片；传统孤子    

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Title Author Date Type Operation

Graphene-metasurface for wide-incident-angle terahertz absorption

Ri-hui Xiong, Xiao-qing Peng, Jiu-sheng Li,lijsh2008@126.com

Journal Article

Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film

Zhengang Lu, Yilei Zhang, Heyan Wang, Chao Xia, Yunfei Liu, Shuliang Dou, Yao Li, Jiubin Tan

Journal Article

From Terahertz Imaging to Terahertz Wireless Communications

Yi Huang,Yaochun Shen,Jiayou Wang

Journal Article

A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands

Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net

Journal Article

A high-precision terahertz retrodirective antenna array with navigation signal at a different frequency

Zhong-bo ZHU, Wei-dong HU, Tao QIN, Sheng LI, Xiao-jun LI, Jiang-jie ZENG, Xian-qi LIN, Leo P. LIGTHART

Journal Article

Frequency–angle two-dimensional reflection coefficient modeling based on terahertz channel measurement

Zhaowei CHANG, Jianhua ZHANG, Pan TANG, Lei TIAN, Li YU, Guangyi LIU, Liang XIA,changzw12345@bupt.edu.cn,jhzhang@bupt.edu.cn

Journal Article

Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review

Lin CHEN, Deng-gao LIAO, Xu-guang GUO, Jia-yu ZHAO, Yi-ming ZHU, Song-lin ZHUANG

Journal Article

cattering-absorbing method for the detection of 16.7 MeV high-energy pulsed gamma

Tan Xinjian,Ouyang Xiaoping,Wang Qunshu

Journal Article

Passive mode-locked Er-doped fiber laser pulse generation based on titanium disulfide saturable absorber

Xinxin Shang, Linguang Guo, Huanian Zhang, Dengwang Li, Qingyang Yue,huanian_zhang@163.com,qingyangyue@sdnu.edu.cn

Journal Article

Development Strategy of Free Electron Laser Technology in China

Li Peng, Li Ming, Wu Dai, Zhou Zheng, Tang Chun

Journal Article

Channelmeasurements and models for 6G: current status and future outlook

Jian-hua ZHANG, Pan TANG, Li YU, Tao JIANG, Lei TIAN

Journal Article

Standardization of 6G Key Technologies: Thoughts and Suggestions

Luo Yan, Quan Wei, Zhang Hongke

Journal Article

Novel X-ray and Optical Diagnostics for Studying Energetic Materials: A Review

Yiyang Zhang, Sen Chen, Yang Cai, Lei Lu, Duan Fan, Jinchun Shi, Junyu Huang, Sheng-Nian Luo

Journal Article

The progress of membrane adsorption and absorption

Lin Ligang,Ye Hui,Zhao Lizhi,Ding Xiaoli,Zhang Yuzhong

Journal Article

Traditional soliton erbium-doped fiber laser with InSe as saturable absorber

Xiaojuan Liu, Guomei Wang, Mingxiao Zhu, Kezhen Han, Wenfei Zhang, Huanian Zhang,zhangwenfei@sdut.edu.cn,huanian_zhang@163.com

Journal Article