Article
Optics
Junxiong Wei, S. Chaitanya Kumar, M. Ebrahim-Zadeh
Summary: A novel approach for injection seeding of pulsed optical parametric oscillators (OPOs) is presented, which provides spectral control over the tuning range and reduces bandwidth to singlemode operation. By utilizing a hybrid design with continuous-wave (cw) OPO injection seeding, signal pulses with narrow linewidth are achieved. The impact of cw injection seeding on pulsed OPO operation is confirmed through various improvements in performance.
Article
Automation & Control Systems
Wei Sheng Tang, Shao Yong Zheng, Yong Mei Pan, Hai Wen Liu
Summary: This article presents a dual-band bandpass filter with a large frequency ratio, independently tunable frequencies, and an ultrawide stopband. It achieves compact size, low insertion loss, and good selectivity by incorporating different components with coupling mechanisms and separate paths.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Yun Liu, Lingyun Liu, Chen Liang, Irfan Majid
Summary: The use of defected ground structures (DGSs) in a planar tunable filter coupling scheme is explored in this study to achieve constant absolute bandwidth (CAB). By implementing DGSs, the filter can control the ratio between electric coupling and magnetic coupling inversely with frequency to achieve wider frequency tuning range and compact structure. External coupling schemes also contribute to maintaining constant bandwidth and high Q factor.
Article
Engineering, Multidisciplinary
Andrea Francesco Russillo, Giuseppe Failla, Gioacchino Alotta
Summary: A novel concept of locally-resonant inertant plate is proposed, which can create a very large band gap in the low-frequency range through periodic inerter-based resonator structures, and it is of significant importance to structural and mechanical engineering applications.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Physics, Multidisciplinary
Kunpeng Jia, Xiaohan Wang, Jian Guo, Yihao Li, Xin Ni, Pengfei Fan, Qiqi Shen, Tao Wang, Xinjie Lv, Gang Zhao, Shu-Wei Huang, Xueming Yang, Zhenda Xie, Shi-ning Zhu
Summary: By developing a box resonator, we achieved continuous tuning and stability of a monolithic optical parametric oscillator, enabling high-precision spectral measurement in the mid-infrared wavelength range.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Ji Chen, Xin Ye, Shenglun Gao, Yuxin Chen, Yunwei Zhao, Chunyu Huang, Kai Qiu, Shining Zhu, Tao Li
Summary: In this study, a planar camera with a silicon nitride metalens array is proposed for wide-angle imaging, achieving a large viewing angle with minimal distortion or aberrations. After stitching, a wide-angle image with a range of >120 degrees is obtained, demonstrating the advantages of metalenses in flexible phase design and compact integration.
Article
Computer Science, Information Systems
Ken Ning, Xiao-Chun Li, Yan Shao, Junfa Mao
Summary: This paper introduces the application of laminated conductor technology to planar-integrated transmission lines. The laminated conductor, composed of multilayers of metal and insulator, has lower conductor loss than a solid conductor. A laminated coplanar waveguide (CPW) with wide bandwidth and low loss is proposed, which uses a laminated conductor for signal lines and grounds based on silicon-based micro electromechanical system technology. The design, fabrication, and measurement of a laminated CPW and its transition are conducted. Simulation results show that the laminated CPW with many insulator layers has low conductor loss. The measurement results demonstrate that the average insertion loss of the laminated CPW is 0.65 dB from DC to 40 GHz, which is 44.4% smaller than that of the solid CPW.
SCIENCE CHINA-INFORMATION SCIENCES
(2023)
Article
Optics
Simon Nellen, Sebastian Lauck, Garrit Schwanke, Milan Deumer, Robert B. Kohlhaas, Lars Liebermeister, Martin Schell, Bjoern Globisch
Summary: In future wireless communication networks at terahertz frequencies, the directivity and beam profile of emitters are crucial, as no additional beam forming optics can be used in free-space. Experimental and numerical investigations showed that the feeding point structure connecting the photodiode and antenna significantly influences the radiation pattern. By optimizing the feeding point, side lobes were reduced from -2 dB to -13 dB and the beam angle was narrowed at 300 GHz.
Article
Engineering, Electrical & Electronic
Ching-Wen Tang, Chieh-Hsuan Yang, Jyun-Siang Liao
Summary: This paper proposes a novel microstrip bandstop filter with extra-high attenuation and wide stopband. The filter uses coupled lines with single-ended ground at the input and output ports to achieve a broad stopband and great attenuation. By differentiating the even- and odd-mode impedances of the coupled lines at the input and output ports, the attenuation within the stopband can be increased.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Article
Multidisciplinary Sciences
Zirui Dong, Jun Luo, Chenyang Wang, Ying Jiang, Shihua Tan, Yubo Zhang, Yuri Grin, Zhiyang Yu, Kai Guo, Jiye Zhang, Wenqing Zhang
Summary: This study reports the discovery of TiRu1+xSb solid solution with wide homogeneity range and tunable thermoelectric properties. It bridges the composition gap between half-Heusler and full-Heusler phases. TiRu1.8Sb exhibits unusually low lattice thermal conductivity among reported half-Heusler phases. In a certain range of Ru composition, TiRu1+xSb shows abnormal semiconductor behavior seemingly related to localized d electrons.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Affan Aziz Baba, Raheel M. Hashmi, Manik Attygalle, Karu P. Esselle, Daniel Borg
Summary: This article presents a new method for designing an ultrawideband beam-steering antenna system, which achieves discrete and continuous beam steering using low-profile and planar phase transformers. The system demonstrates a wideband matching bandwidth and has the potential for applications in defense.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Optics
Xingrui Huang, Yang Liu, Zhiyong Li, Zhongchao Fan, Weihua Han
Summary: This paper proposes a silicon-rich nitride-lithium niobate on insulator hybrid platform with waveguides and key components, showcasing a variety of passive and active devices with high performance. The platform demonstrates low loss, high integration density, and promising potential for emerging photonics integrated circuits.
Article
Engineering, Electrical & Electronic
Chen Zhao, Shuo Tian, Wangqi Liu, Xiaoyi Liao, Xiaoxing Fang, Shaomeng Wang
Summary: This article investigates the operation principle and dispersion properties of the co-planar slow wave structure (SWS). The SWS is analyzed using an equivalent circuit model, and the theoretical calculation results are in good agreement with the simulations. Particle-in-cell (PIC) simulation and measurements validate the tunable frequency range and high power output characteristics of the proposed SWS, making it suitable for millimeter-wave BWO applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Editorial Material
Chemistry, Multidisciplinary
Zhi-Hao Wang, Su-Huai Wei, Xie Zhang
Summary: In this article, the authors proposed the use of CuI-CuBr alloys as a hole-density-tunable p-type transparent semiconductor and attributed the acceptor state to Cu vacancies through first-principles calculations. However, it is found that the first-principles results in the paper are unphysical and misleading due to the adoption of an incorrect level of theory and the lack of a rigorous methodology for computing defect formation energies.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Automation & Control Systems
Jiancheng Dong, Kai Xu, Jin Shi
Summary: The article introduces a compact differential tunable dual-band bandpass filter with a tunable lower passband and a fixed upper passband. Compared with existing technology, it offers a wider tuning range, compact size, fewer control voltages, and a simple structure.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Optics
Yue Wang, Yongqiang Zhu, Zijian Cui, Haoqing Jiang, Kuang Zhang, Xuan Wang
Summary: This study proposes a machine-learning-assisted bidirectional ensemble learning framework for designing composite metamaterial absorbers. The framework reveals the relationship between the composite metamaterial structure and its absorption spectrum, and can predict the absorption spectrum and extract the structure parameters.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Chemistry, Physical
Yue Wang, Xiang Zhang, Xiaoju Zhang, Tao Zhou, Zijian Cui, Kuang Zhang
Summary: Single-walled carbon nanotubes have been extensively researched for their optoelectronic response in the terahertz frequency range. In this study, a thin isotropic film of single-walled carbon nanotubes was obtained and its absorption and dispersion properties were investigated using terahertz time-domain spectroscopy. A novel terahertz metasurface was demonstrated by etching subwavelength arrays on the film's surface, leading to enhanced electromagnetic field generation for chemical sensing applications. The sensor performance of the metasurface showed high detection sensitivity and low minimum detection mass, offering a systematic design strategy for carbon nanotube-based metasurfaces in biochemical sensing.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Optics
Zijian Cui, Yue Wang, Yongqiang Shi, Yongqiang Zhu, Dachi Zhang, Zhiqi Hong, Xuping Feng
Summary: This study proposes and experimentally verifies a novel scheme based on an all-silicon terahertz plasmon metasurface, which exhibits high sensitivity for detecting Bacillus thuringiensis Cry1Ac toxin. The resonance amplitude variation and frequency shift of the metasurface are investigated by analyzing the changes in sample thickness and permittivity, reflecting the protein residue in the actual process. The reliability and stability of the metasurface chip are verified through time period, temperature, and humidity control.
PHOTONICS RESEARCH
(2022)
Article
Optics
Zihan Zhao, Yue Wang, Xumin Ding, Haoyu Li, Jiahui Fu, Kuang Zhang, Shah Nawaz Burokur, Qun Wu
Summary: This paper presents the design and demonstration of a compact logic operator based on a single-layer metasurface operating at microwave frequency. By mapping nodes in the trained fully connected neural network (FCNN) to specific unit cells in the metasurface, a logic operator with only one hidden layer is physically realized. Experimental results verify that the proposed metasurface logic operator can achieve three basic logic operations (NOT, OR, and AND) under different input signals.
PHOTONICS RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Xiaoju Zhang, Yue Wang, Xiang Zhang, Tao Zhou, Kuang Zhang, Xinmei Wang
Summary: In this paper, a novel composite THz metasurface integrated by carbon nanotubes (CNTs) resonant metasurface and silicon microfluidic channel has been proposed. It combines the advantages of semiconductor and carbon nanotubes film materials, and demonstrates good absorption characteristics and refractive index sensing capabilities.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Xiaoju Zhang, Yue Wang, Zijian Cui, Xiang Zhang, Lisha Yue, Kuang Zhang
Summary: This study proposes two types of all-silicon multi-band THz metasurface sensors, which achieve more than 90% multi-band resonance absorption. The sensing applications of these sensors are demonstrated by detecting different concentrations of saccharides and 2,4-D solutions.
Article
Engineering, Electrical & Electronic
Yu Liu, Peibing Du, Feng Han, Libing Cai, Hongxin Qi, Hongfu Xia, Jianguo Wang
Summary: A Bayesian approach based on the vulnerability distribution is proposed to estimate the confidence limits of the state probability and the threat level of multistate electronic systems interfered by intentional electromagnetic interference (IEMI). The uncertainty of the state probability function is discussed and the confidence limits are inferred by the marginal distribution of the state probability, which is induced by combining the Dirichlet and vulnerability distributions.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2022)
Article
Engineering, Electrical & Electronic
Ya Li, Li Liu, Jianguo Wang, Yinghong Zuo, Jinhui Zhu, Shengli Niu, Xiaoping Ouyang
Summary: Research on high-altitude electromagnetic pulse (HEMP) has focused mainly on the early-time (E1) component, with the intermediate-time (E2) component receiving less attention. However, E2 poses a threat to power systems as it can couple into cables over several kilometers. This article presents a numerical simulation method for E2, which fills a gap in current E2 simulation and allows for more accurate and complete simulation of the HEMP environment.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2022)
Article
Engineering, Electrical & Electronic
Yinghong Zuo, Jianguo Wang, Peng Shang, Jinhui Zhu
Summary: This study presents a Monte Carlo simulation model for neutron transport under different humidity conditions and calculates and analyzes the neutron dose parameters at different transport distances for a scenario of a nuclear device explosion. The study finds a quantitative relationship between neutron dose and atmospheric water content and proposes a fast-parameterized calculation method under different humidity conditions.
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Ya Li, Jianguo Wang, Yinghong Zuo, Shengli Niu, Jinhui Zhu, Xiaoping Ouyang
Summary: This article analyzes the sensitivity of parameters in the conductivity model, emphasizing that electron mobility is the most important parameter. It systematically explores the relationship between peak electric field and electron mobility under different conditions. The study concludes that a reasonable mobility fitting formula should take into account various factors and the fitting result should be as close as possible to the measured value.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2022)
Article
Engineering, Electrical & Electronic
Yinghong Zuo, Jianguo Wang, Jinhui Zhu, Shengli Niu, Li Liu
Summary: Through experiments and Monte Carlo simulations, the irradiation effects of intense pulsed gamma rays on coaxial cables were studied, revealing that under certain conditions, the electron charge deposition in the center conductor shows a trend of increasing, decreasing, and then increasing with the energy of gamma rays.
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
(2022)
Article
Mathematics, Applied
Feng Han, Yu Liu, Jianguo Wang
Summary: In this article, a posteriori error neural network (PENN) is proposed for the finite element approximate solution of diffusion problems. The PENN is constructed to solve a minimum problem which is obtained from the Prager and Syge equality. Then the output of the PENN can be used to estimate the posteriori error of the finite element approximate solution. There are two-fold differences compared to the classic methods. Firstly, the PENN provides a mesh-free recovery type error estimator. A flux is constructed by a neural network which does not need any given mesh. Secondly, once finishing the training procedure for an given approximate solution, the PENN can be used to estimate posteriori error for other approximate solution without training the PENN again. This feature is useful when we just use the posteriori error distribution as the indicator for adaptive refinement. The effectiveness of the PENN is demonstrated through a set of classical numerical experiments.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2023)
Article
Optics
Yue Wang, Dachi Zhang, Guangcheng Sun, Zhenyu Yao, Kuang Zhang, Wei Shi
Summary: In this paper, a graphene metagrating that can support quasi-BIC by introducing periodic perturbations is proposed. The transmission spectrum at normal and oblique incidence is discussed. The resonances are analyzed to clarify the mechanism of quasi-BIC by the multipolar decomposition of radiative power and the electric field distribution.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Zijian Cui, Yue Wang, Guangcheng Sun, Wenshuo Chen, Kuang Zhang, Xinmei Wang
Summary: This study successfully demonstrates a Friedrich-Wintgen bound states in the continuum (BIC) based on mode coupling in a terahertz metasurface. The transition from ideal BIC to quasi-BIC is caused by coupling mismatch, resulting in increased Q-factor and electric field enhancement.
Article
Nanoscience & Nanotechnology
Yue Wang, Zhenyu Yao, Zijian Cui, Guangcheng Sun, Dachi Zhang
Summary: This study proposes and experimentally demonstrates a metasurface holography multiplexing scheme based on multiple polarization channels combined with OAM. Multiple OAM multiplexing holograms are constructed in multiple different spin-polarization channels, and two multiplane holograms and 15 OAM multiplexing holograms are successfully integrated on a single metasurface. An optical nested encryption framework for parallel communication is also introduced.
