Article
Physics, Applied
Yujie Dong, Xiyu Sun, Yan Li, Yi Liu
Summary: In this paper, a thermally tunable full space metasurface based on Pancharatnam-Berry phase modulation and InSb temperature characteristic was proposed and analyzed. The metasurface can achieve efficient transmission and reflection of incident circularly polarized light at different frequencies under specific temperatures. Dynamically tunable metalenses were also proposed for generating focused vortex light. These findings provide a potential direction for the development of efficiency-tunable PB terahertz devices in the future.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Qili Yang, Yan Wang, Lanju Liang, Maosheng Yang
Summary: A transparent geometric metasurface composed of InSb cylindroid is proposed to generate vortex beams in the terahertz region, with a wide operating frequency range and high mode purity. By changing the temperature of the cylindroid, broadband frequency coverage can be achieved without altering the size of the device.
Article
Nanoscience & Nanotechnology
Bin He, Jiaqi Liu, Yongzhi Cheng, Fu Chen, Hui Luo, Xiangcheng Li
Summary: In this paper, a broadband and thermally switchable reflective metasurface based on InSb Z-shape resonator structure was proposed for the generation of vortex beams in the terahertz range. Numerical simulation results showed that the operation frequency range and efficiency remained relatively stable within a certain temperature range. By changing the temperature, the metasurface could convert the incident circular-polarization wave to its orthogonal component, resulting in the generation of vortex beams.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Wenxuan Wu, Rong Lin, Na Ma, Ping Jiang, Xiaoyong Hu
Summary: Researchers propose a thermally tunable THz PB meta-atom and investigate various functional devices using this meta-atom. The study shows that the working states of these devices can be switched by changing the temperature of the material.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Physics, Multidisciplinary
Huanxi Ma, Guangwu Pan, Guoliang Yuan, Yuting Xie, Zhi Li, Zhili Lin, Shaojian Su, Weibin Qiu, Beiju Huang, Qiang Kan
Summary: A broadband vortex beam generator based on the graphene metasurface reflectarray is demonstrated in the terahertz region, showing the generation of vortex waves with high purity.
Article
Optics
Huiyun Zhang, Xin Teng, Meng Tian, Meng Liu, Yuping Zhang
Summary: We proposed a tunable bi-direction terahertz vortex beam generator based on Dirac semimetals (DSMs) and Vanadium dioxide (VO2). The insulator-metal phase transition of VO2 allows for a switch between transmissive and reflective vortex beams by changing the external temperature. By changing the Fermi energy level of the DSMs, we designed a vortex beam generator with topological charges -1, -2, +3 in transmission mode, achieving tunable terahertz vortex beams from 0.89 THz to 1.13 THz. Additionally, the proposed metasurface generates broadband terahertz vortex beams with topological charges -1, -2, +3 from 1.0 THz to 1.8 THz when VO2 is in the metal state.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Yue Wang, Dajian Cui, Yu Wang, Guohui Yang, Chunhui Wang
Summary: In this paper, an all-solid-state and hybrid electrically/thermally tunable multifunctional metasurface array is proposed, based on graphene pattern and vanadium dioxide configuration. It can achieve band-stop filtering, beam steering, and beam splitting functions, showing great potential in the field of multifunctional integrated chips.
Article
Materials Science, Multidisciplinary
Ivan Fanyaev, Ihar Faniayeu, Jingwen Li, Sergei Khakhomov
Summary: The proposed electro-thermally tunable hyperlens design, consisting of alternating graphene/metal/dielectric layers, enables subdiffraction far-field imaging and real-time amplification at terahertz frequencies. By tuning the chemical potential of the graphene layer through applied voltage, it enhances the intensity of the subwavelength image in the near and far zones. This dynamically tunable hyperlens offers multifunctional possibilities for light manipulation and improves the quality of subwavelength images in the terahertz range.
RESULTS IN PHYSICS
(2023)
Article
Multidisciplinary Sciences
Liang Zhang, Jie Guo, Tongyu Ding
Summary: An anisotropic coding metasurface is proposed in this paper to achieve a dual-mode vortex beam generator by independently manipulating orthogonally linearly polarized waves. The ultrathin single-layer ground-backed Jerusalem cross structure provides complete and independent control of the incident waves, simplifying the design process. Experimental measurements on the fabricated prototype demonstrate high quality and good agreement with theoretical designs and simulation results, suggesting potential applications in wireless communication systems in the microwave region.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Wenxuan Wu, Meng Zhang, Chengchen Wang, Tianyu Zhao, Nianqi Kuang, Youtao Zeng, Haixi Luo, Ping Jiang
Summary: This paper uses the discrete transmission phase principle and temperature-tunable material InSb to achieve full phase coverage in the frequency range from 0.75 THz to 0.95 THz, and successfully fabricates a series of broadband temperature-controlled transmissive functional metasurfaces, which is expected to broaden the practical application of metasurfaces in the THz band.
OPTICS COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Yafeng Lu, Chen Wang, Shiqiang Zhao, Yongzheng Wen
Summary: Graphene is proposed as a platform for THz devices, and a graphene-based THz metasurface using cut-wire arrays is introduced for magnetic manipulation of THz waves. This structure allows efficient tuning of the metasurface response, making it suitable for applications such as compact THz modulators and magnetic field sensors.
FRONTIERS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Xueying Li, Ying Zhang, Jiuxing Jiang, Yongtao Yao, Xunjun He
Summary: In this study, a method using terahertz metasurface unit cells to generate vortex beams with different wavefronts and efficiently shape the wavefronts in full-space is proposed. This method shows great potential for applications in 6G terahertz communications.
Article
Optics
Haiyang Ren, Weiwei Yue, Jian Liu, Liyuan Liu, Zhaoxin Geng
Summary: A flexible metasurface based on parylene-C film was proposed in this study, featuring elliptical split-ring units that can function as 2D beam deflectors, 3D beam deflectors, or vortex generators in the THz band. The metasurface demonstrates broadband effects and enables modulation of THz waves for various applications in THz optical field modulation and communication.
OPTICS COMMUNICATIONS
(2022)
Article
Physics, Applied
Jiu-Sheng Li, Wei-Mang Pan
Summary: This study proposes a silicon-based metasurface structure for flexible adjustment of terahertz waves by manipulating various combinations of OAM, including vortex beam and beam splitting combination, vortex beam splitting, deflected beam and vortex beam combination. The design features a simple structure, flexible control, and easy adjustment in arbitrary directions.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Optics
Shuvajit Roy, Kapil Debnath
Summary: In this paper, a new method of tuning graphene-based terahertz (THz) metasurfaces is proposed using the electromechanical method. By supporting a free-standing graphene layer on an oxide grating on a gold substrate, the resonance wavelength of the metasurface can be shifted by causing a deflection in the free-standing regions of the graphene layer through the potential difference between the graphene layer and the gold substrate. Numerical simulation shows continuous tunability of the resonant frequency over a frequency range of 0.5 THz for an applied external potential of only 20 V. The application of the proposed metasurface in THz modulation is also demonstrated.
OPTICS COMMUNICATIONS
(2023)
Article
Microbiology
Peng Shi, Jianli Zhang, Xingyue Li, Liyun Zhou, Hui Luo, Li Wang, Yafan Zhang, Minxia Chou, Gehong Wei
Summary: Efficient screening methods are essential for obtaining plant growth-promoting rhizobacteria (PGPR) from the natural environment, which play a significant role in sustainable agriculture. Current traditional screening criteria based on knowledge of PGP mechanisms may not always be effective due to complex plant-microbe interactions. This study aimed to analyze the correlation between metabolic phenotypes of rhizobacterial isolates and their PGP ability, and evaluate the feasibility of using these phenotypes as screening criteria. The results suggest that the utilization of specific nutrient substrates related to root exudate components may be better indicators for primary screening of PGPR than traditional PGP traits.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Engineering, Environmental
Fu Chen, Shanshan Zhang, Beibei Ma, Yao Xiong, Hui Luo, Yongzhi Cheng, Xiangcheng Li, Xian Wang, Rongzhou Gong
Summary: In this study, bimetallic CoFe-MOF@Ti3C2Tx MXene derived multiple-interfacial composites with controllable structures were prepared and their microwave absorption properties were investigated. The results show that the synthesized composite exhibits excellent microwave absorption performance, providing a new approach for the design of high-performance microwave absorbing materials.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Dongru Yang, Yongzhi Cheng, Fu Chen, Hui Luo, Ling Wu
Summary: In this paper, a broadband reflective metasurface (MS) with patterned graphene is proposed and numerically investigated for wavefront manipulation in the terahertz (THz) region. The unit-cell of the proposed reflective MS consists of a dielectric substrate, a single layer oval-hollow-structure (OHS) graphene, and a metal ground-plane, enabling cross-polarization conversion of circularly polarized (CP) waves in reflection mode. By changing the orientation angle of the OHS graphene, full 2 pi phase shifts of the reflected orthogonal CP wave can be achieved over a broadband frequency range with different Fermi energy levels (EF). Furthermore, the efficiency of reflection CP conversion is highly dependent on EF variation. Particularly, the efficiency of anomalous reflection and focusing effect of the reflective MS can be dynamically adjusted by changing EF. It has great prospects in THz applications such as communication and imaging.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Optics
Jiaqi LIu, Yongzhi Cheng, Fu Chen, Hui Luo, Xiangcheng Li
Summary: A transmissive metasurface is proposed to generate terahertz vortex beams with different topological charges at three different frequencies. The designed metasurface can independently manipulate circularly polarized waves at these frequencies, with high mode purity.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Yongzhi Cheng, Yingjie Qian, Hui Luo, Fu Chen, Zhengze Cheng
Summary: In this paper, a narrowband perfect metasurface absorber (MSA) based on a micro-ring-shaped GaAs array was proposed and theoretically investigated in the terahertz (THz) region for enhanced refractive index (RI) sensing. Simulation results showed that the proposed perfect MSA achieved an absorbance of 99.9% at 2.213 THz with a Q-factor of approximately 460.08, which was efficiently confirmed by the coupling mode theory (CMT). The perfect absorption of the designed structure was primarily contributed by the guided mode of critical resonance coupling. The absorption properties of the proposed structure could be adjusted by changing the geometrical parameters of the GaAs structure. The proposed MSA, due to its higher Q-factor, can enhance RI sensing applications with a sensitivity of about 1.45 THz/RIU. This research provides a new approach for constructing highly efficient MSAs with potential applications in sensing, detecting, and imaging in the THz region.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Chemistry, Physical
Shupeng Sun, Yongzhi Cheng, Hui Luo, Fu Chen, Xiangcheng Li
Summary: In this paper, a notched-wideband bandpass filter based on spoof surface plasmon polaritons (SSPPs) with loaded resonator structure is proposed. The dispersion and transmission properties of the designed filter are analyzed and compared, showing wide passband and notch-band transmission properties.
Article
Engineering, Electrical & Electronic
Zimu Zhang, Yongzhi Cheng, Hui Luo, Fu Chen
Summary: This paper proposes a wideband circular polarization metasurface antenna, consisting of a centrosymmetric structure with a mode suppressor and an asymmetric aperture-coupled feed structure separated by dielectric substrates. Two orthogonal modes with a 90 degrees phase difference are excited by an L-shaped slot and a microstrip line in the aperture-coupled feed structure to achieve CP radiation. Two methods are proposed to expand the CP bandwidth: directly suppressing the characteristic mode and indirectly suppressing it using a mode suppressor. The fabricated antenna shows a low profile of ?(0) x ?(0) x 0.075 ?(0) at 5 GHz, with a 3 dB axial ratio bandwidth of 45.2% (4.1-6.5 GHz), an impedance bandwidth of 41.8% (4.1-6.31 GHz), and a peak gain of 7.94 dBic at 5.9 GHz.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Chemistry, Physical
Beibei Ma, Fu Chen, Yongzhi Cheng, Xian Wang, Shuoqing Yan, Rongzhou Gong, Hui Luo
Summary: In this study, Ti3C2Tx MXene@NiFe-layered double hydroxide (NiFe-LDH) derived multi-interfacial FeNi3/TiN@nitrogen-doped carbon (NC)@magnetic multiwalled carbon nanotube composites were prepared using a hydrothermal process and subsequent carbothermal reduction. The phase compositions, morphology, defects, and electromagnetic parameters of the composites can be adjusted by the thermal treatment temperature. The composites exhibit high reflection loss and effective absorption bandwidth, making them promising microwave absorption materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Dongru Yang, Yongzhi Cheng, Hui Luo, Fu Chen, Ling Wu
Summary: This paper presents a simple design of an ultrathin and ultra-broadband single-layer metamaterial surface (MS) based on a double-arrow-shaped resonator (DASR) structure for both transmission and reflection modes in the terahertz (THz) region. The single-layer MS consists of a periodic array of metal DASRs and complementary circular patches (CCPs) on a thin dielectric substrate. Numerical results show that the MS structure can convert circularly polarized (CP) waves to their orthogonal components after reflection and transmission simultaneously, with an average amplitude of approximately 0.45 from 0.45 to 1.75 THz and a relative bandwidth of 118.2%. The CP conversion efficiency is close to the theoretical limit of 25% for single-layer structures. Additionally, by adjusting the orientation angle (alpha) of the DASR structure along the wave propagation direction, 0-2 pi phase shifts for the reflected and transmitted orthogonal CP waves can be achieved simultaneously. Numerical simulations demonstrate wave beam deflection, vortex beam generation, and focusing effects for both reflection and transmission modes. This design offers new possibilities and potential for developing multifunctional full-space devices.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Chemistry, Physical
Fu Chen, Yongzhi Cheng, Xiangcheng Li, Hui Luo
Summary: This study successfully prepared 2D Ti3CNTx-based magnetic composites by modifying Ti3CNTx nanomaterials and combining them with magnetic materials, achieving broadband microwave absorption. The microwave absorption properties of the composites were investigated by varying the volume ratio of the nanomaterials and the filling ratio of the absorber. With a thickness of 1.32 mm, the absorber achieved a bandwidth of 4.75 GHz. Integrated with a macroscale multilayer periodic gradient design, the metastructure based on FCM (Fe@NC/Ti3CNTx) composites achieved broadband microwave absorption with an EAB of 12.5 GHz ranging from 5.5 GHz to 18 GHz at a total thickness of 4.5 mm. The microwave attenuation mechanisms were studied through dielectric loss, magnetic loss, and impedance matching. The multi-scale development of MXene-based magnetic composites enables their potential application in broadband microwave absorption.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Sihai Lv, Yongzhi Cheng, Fu Chen, Xiangcheng Li, Hui Luo
Summary: This study proposes the incorporation of manganese oxide into carbon matrix magnetic composites to enhance the electromagnetic wave (EMW) absorption properties. Multiple interfacial ternary-component Fe3C/MnO/Nitrogen-doped carbon (NC) absorbers were synthesized through facile hydrothermal, oxidative polymerization, and carbothermal reduction processes. The designed composites exhibit excellent EMW absorption properties, with an effective absorption bandwidth of 4.88 GHz (13.12-18 GHz) at a mere thickness of 1.5 mm. The outstanding performance of EMW absorption can be attributed to effective modulation of electromagnetic parameters through a large number of heterogeneous interfaces, defects, and magnetic loss. Meanwhile, adjusting the filling ratios of the composites in the absorber can significantly adjust the electromagnetic parameters of the samples. This work presents an effective approach for the preparation of high-performance EMW absorbers with ternary components, as well as a strategy for developing novel broadband absorbers that are lightweight and have thin thickness.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Automation & Control Systems
Mingkang Long, Qing An, Housheng Su, Hui Luo, Jin Zhao
Summary: In this work, the consensus issues of discrete-time multi-agent systems with completely unknown dynamic are investigated using reinforcement learning technique. A value iteration based model-free algorithm is proposed for consensus of these systems with optimal performance. To implement the algorithm without information of dynamics, actor-critic networks are constructed to estimate the value functions and optimal control inputs in real time. Simulation results verify the validity of the proposed algorithm.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2023)
Article
Materials Science, Multidisciplinary
Jintao Zheng, Tianyu Qian, Jiajia Li, Zhiqiang Xiong, Hui Luo, Shilong Jin, Zhiguo Wang
Summary: This paper derives a transfer function model of the spin precession phase and analyzes the noise mechanism of the comagnetometer. It reveals the main sources of noise and emphasizes the significance of spin oscillator symmetry. The paper also discusses control parameter optimization and closed-loop control to enhance the comagnetometer's performance. Furthermore, it explores the trade-off between bandwidth and sensitivity in the comagnetometer system of nuclear magnetic resonance gyroscopes.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Linhui Dong, Yongzhi Cheng, Hui Luo, Fu Chen, Xiangcheng Li
Summary: This paper proposes an all-metal metasurface that enables circular polarization conversion and wavefront manipulation of terahertz waves. Numerical simulations demonstrate high transmission and reflection conversion coefficients over a wide frequency range, as well as the ability to achieve 2 pi-phase full coverage. The study also showcases the multifunctional wavefront manipulation capabilities of the proposed metasurface.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Jiaao Yu, Hui Luo, Zhihui Wang, Sihai Lv, Yongzhi Cheng, Fu Chen, Shuoqing Yan, Xiangcheng Li
Summary: By adjusting the thermal treatment temperatures, magnetic N-doped carbon foams with diverse surface morphologies were synthesized, and their microstructure, electromagnetic parameters, and microwave absorption properties could be tailored. The results showed that the composites exhibited exceptional microwave absorption properties and reduction of the far-field radar cross section (RCS).
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
