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A Wideband Amplifying and Filtering Reconfigurable Intelligent Surface for Wireless Relay 认领 引用
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作者 Lijie Wu Qun Yan Zhou +11 位作者 Jun Yan Dai Siran Wang Junwei Zhang Zhen Jie Qi Hanqing Yang Ruizhe Jiang Zheng Xing Wang Huidong Li Zhen Zhang Jiang Luo Qiang Cheng Tie Jun Cui 《Engineering》 SCIE EI CSCD 2026年第1期120-129,共10页
Programmable metasurfaces have garnered significant attention due to their exceptional ability to manipulate electromagnetic(EM)waves in real time,propelling the emergence of reconfigurable intelligent surfaces(RISs)a... Programmable metasurfaces have garnered significant attention due to their exceptional ability to manipulate electromagnetic(EM)waves in real time,propelling the emergence of reconfigurable intelligent surfaces(RISs)as a transformative advancement in wireless communication for controlling signal propagation and coverage.However,conventional RISs often suffer from a limited operational range and spectral interference,hindering their practical deployment in wireless relay and communication systems.To overcome this limitation,we propose an amplifying and filtering RIS(AF-RIS)to enhance the inband signal energy and filter the out-of-band signal of the incident EM waves,thereby achieving RIS array miniaturization and improved anti-interference capability.Furthermore,each AF-RIS element features 2-bit phase control,significantly improving the array's beamforming performance.A meticulously designed4×8 AF-RIS array is presented by integrating the power dividing and combining networks,which substantially reduces the number of amplifiers and filters,drastically decreasing the hardware costs and power consumption.The experimental results demonstrate the powerful capabilities of the AF-RIS in beam-steering,frequency selectivity,and signal amplification.Thus,the proposed AF-RIS offers significant potential for critical wireless relay applications by improving frequency selectivity,expanding signal coverage,and minimizing hardware size. 展开更多
关键词 Reconfigurable intelligent surface Programmable metasurface Wireless relay Signal filtering Signal energy enhancement
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High-precision passive sensing with large-scale programmable metasurface 认领 引用
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作者 Zhiqiao Han Qian Ma +1 位作者 Ze Gu Tie Jun Cui 《Frontiers of physics》 SCIE CSCD 2026年第6期31-42,共12页
With the rapid development of sixth-generation(6G)intelligent wireless networks,environmental sensing has become a core requirement for many applications such as autonomous driving,drones,and intelligent robotics.Here... With the rapid development of sixth-generation(6G)intelligent wireless networks,environmental sensing has become a core requirement for many applications such as autonomous driving,drones,and intelligent robotics.Here,we propose a passive sensing method based on beam-focusing algorithms and a large-scale programmable metasurface composed of 64×96 effective elements.The coding patterns on the 1-bit programmable metasurface are dynamically switched via a field-programmable gate array(FPGA)to achieve real-time beam focusing and scanning at specific spatial locations.The reflected signal strength is then used to determine the target angle and distance.Requiring only a single RF channel and signal strength information,the system features a simple hardware architecture and low computational complexity.To verify the effectiveness and robustness of the proposed method,experiments are conducted across 74 positions within an azimuth-angle range from−70°to 70°and a distance range from 1 m to 3 m.The experimental results demonstrate that the proposed sensing method achieves high precision in both angle and distance for passive targets,with an average absolute angle error of 0.904°and an average absolute distance error of 0.101 m.The proposed system provides a promising solution for applications in the Internet of Things,directional communication,and biomedical fields. 展开更多
关键词 programmable metasurface beam focusing angle and distance estimation passive target
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A Planar 4-Bit Reconfigurable Antenna Array Based on the Design Philosophy of Information Metasurfaces 认领 引用 被引量：6
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作者 Zheng Xing Wang Hanqing Yang +5 位作者 Ruiwen Shao Jun Wei Wu Guobiao Liu Feng Zhai Qiang Cheng Tie Jun Cui 《Engineering》 SCIE EI CAS CSCD 2022年第10期64-74,共11页
Inspired by the design philosophy of information metasurfaces based on the digital coding concept,a planar 4-bit reconfigurable antenna array with low profile of 0.15λ0(whereλ0is the free-space wavelength)is present... Inspired by the design philosophy of information metasurfaces based on the digital coding concept,a planar 4-bit reconfigurable antenna array with low profile of 0.15λ0(whereλ0is the free-space wavelength)is presented.The array is based on a digital coding radiation element consisting of a 1-bit magnetoelectric(ME)dipole and a miniaturized reflection-type phase shifter(RTPS).The proposed 1-bit ME dipole can provide two digital states of"0"and"1"(with 0°and 180°phase responses)over a wide frequency band by individually exciting its two symmetrical feeding ports.The designed RTPS is able to realize a relative phase shift of 173°.By digitally quantizing its phase in the range of 157.5°,additional eight digital states at intervals of 22.5°are obtained.To achieve low sidelobe levels,a 1:16 power divider based on the Taylor line source method is employed to feed the array,A prototype of the proposed 4-bit antenna array has been fabricated and tested,and the experimental results are in good agreement with the simulations.Scanning beams within a±45°range were measured with a maximum realized gain of 13.4 dBi at12 GHz.The sidelobe and cross-polarization levels are below-14.3 and-23.0 dB,respectively.Furthermore,the beam pointing error is within 0.8°,and the 3 dB gain bandwidth of the broadside beam is 25%.Due to its outstanding performance,the array holds potential for significant applications in radar and wireless communication systems. 展开更多
关键词 4-bit reconfigurable antenna array Information metasurface Digital coding method Low sidelobe Low profile
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A High-Efficiency and Versatile Reconfigurable Intelligent Surface Design Paradigm with Novel Topological Representation 认领 引用
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作者 Ying Juan Lu Jia Nan Zhang +8 位作者 Yi Han Zhao Jun Wei Zhang Zhen Zhang Rui Zhe Jiang Jing Cheng Liang Hui Dong Li Jun Yan Dai Tie Jun Cui Qiang Cheng 《Engineering》 SCIE EI CSCD 2025年第5期163-173,共11页
With digital coding technology,reconfigurable intelligent surfaces(RISs)become powerful real-time sys-tems for manipulating electromagnetic(EM)waves.However,most automatic RIS designs involve exten-sive numerical simu... With digital coding technology,reconfigurable intelligent surfaces(RISs)become powerful real-time sys-tems for manipulating electromagnetic(EM)waves.However,most automatic RIS designs involve exten-sive numerical simulations of the unit,including the passive pattern and active devices,requiring high data acquisition and training costs.In addition,for passive patterns,the widely employed random pixe-lated method presents design efficiency and effectiveness challenges due to the massive pixel combina-tions and blocked excitation current flow in discrete patterns.To overcome these two critical problems,we propose a versatile RIS design paradigm with efficient topology representation and a separate design architecture.First,a non-uniform rational B-spline(NURBS)is introduced to represent continuous pat-terns and solve excitation current flow issues.This representation makes it possible to finely tune con-tinuous patterns with several control points,greatly reducing the pattern solution space by 20-fold and facilitating RIS optimization.Then,employing multiport network theory to separate the passive pat-tern and active device from the unit,the separate design architecture significantly reduces the dataset acquisition cost by 62.5%.Through multistep multiport calculation,the multistate EM responses of the RIS under different structural combinations can be quickly obtained with only one prediction of pattern response,thereby achieving dataset and model reuse for different RIS designs.With a hybrid continuous-discrete optimization algorithm,three examples—including two typical high-performance RISs and an ultra-wideband multilayer RIS—are provided to validate the superiority of our paradigm.Our work offers an efficient solution for RIS automatic design,and the resulting structure is expected to boost RIS appli-cations in the fields of wireless communication and sensing. 展开更多
关键词 Reconfigurable intelligent surfaces Non-uniform rational B-splines Separate design architecture Dataset reuse Versatile metasurfaces design
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Active odd-mode-metachannel for single-conductor systems 认领 引用 被引量：1
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作者 Pei Hang He Ling Yun Niu +5 位作者 Yi Fan Hao Chi Zhang Le Peng Zhang Dayue Yao Wen Xuan Tang Tie Jun Cui 《Opto-Electronic Advances》 SCIE EI CAS 2022年第8期1-10,共10页
Although tremendous efforts have been devoted to investigating planar single-conductor circuits,it remains challenging to provide tight confinement of electromagnetic field and compatibility with active semi-conductor... Although tremendous efforts have been devoted to investigating planar single-conductor circuits,it remains challenging to provide tight confinement of electromagnetic field and compatibility with active semi-conductor components such as amplifier,harmonic generator and mixers.Single-conductor spoof surface plasmon polariton(SSPP)structure,which is one of the most promising planar single-conductor transmission media due to the outstanding field confinement,still suf-fers from the difficulty in integrating with the active semi-conductor components.In this paper,a new kind of odd-mode-metachannel(OMM)that can support odd-mode SSPPs is proposed to perform as the fundamental transmission chan-nel of the single-conductor systems.By introducing zigzag decoration,the OMM can strengthen the field confinement and broaden the bandwidth of odd-mode SSPPs simultaneously.More importantly,the active semi-conductor amplifier chip integration is achieved by utilizing the intrinsic potential difference on OMM,which breaks the major obstacle in im-plementing the single-conductor systems.As an instance,an amplifier is successfully integrated on the single-conductor OMM,which can realize both loss compensation and signal amplification.Meanwhile,the merits of OMM including crosstalk suppression,low radar cross section(RCS),and flexibility are comprehensively demonstrated.Hence,the pro-posed OMM and its capability to integrate with the active semi-conductor components may provide a new avenue to fu-ture single-conductor conformal systems and smart skins. 展开更多
关键词 odd-mode spoof surface plasmon polariton single-conductor system amplifier crosstalk suppression low RCS flexibility
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2nd-Order Debye relaxation in electromagnetic metasurfaces for wideband dispersion engineering 认领 引用 被引量：4
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作者 Xinmin Fu Yajuan Han +7 位作者 Jiafu Wang Jie Yang Yong Sun Chang Ding Yuxiang Jia Jun Wang Shaobo Qu Tiejun Cui 《Light: Science & Applications》 SCIE EI CAS CSCD 2025年第5期1433-1445,共13页
In dielectric physics,electromagnetic(EM)properties of dielectrics arise from several important polarization mechanisms that can be described by Debye,Drude or Lorentz models.Metamaterials,as well as their 2D counterp... In dielectric physics,electromagnetic(EM)properties of dielectrics arise from several important polarization mechanisms that can be described by Debye,Drude or Lorentz models.Metamaterials,as well as their 2D counterparts-metasurfaces,can exhibit bizarre EM parameters such as negative permittivity,whereas polarization mechanisms leading to such have long been discussed in dielectric physics.Drude and Lorentz's models are usually used in metamaterial design,whereas the Debye model is almost absent,though it is so important in dielectric physics.This leaves an unreconciled gap between the dielectric physics and metamaterials.In this paper,we explore Debye relaxations in metasurfaces for the sake of wideband dispersion engineering.By analyzing two fundamental resonance modes of a typical meta-atom,we first show that the reflection phase experiences 1st-order Debye relaxation under the two resonances,although they are typically Lorentzian.More importantly,the two resonances can be tailored to form a 2nd-order Debye relaxation process so as to achieve smooth phase variations in between them,which lays a solid foundation for wideband dispersion engineering.As proof of concept,we propose a quad-ellipticalarc(QEA)structure as the meta-atom,whose dispersion can be customized by tailoring the 2nd-order Debye relaxation.With this meta-atom,we demonstrated two metasurface prototypes that can achieve chromatic and achromatic focusing,respectively,in the entire X band(8.0–12.0 GHz),showcasing the powerful capacity of wideband dispersion engineering.This work digs out relaxation processes in metamaterials and opens up new territories for metamaterial research,which may find wide applications in wideband devices and systems. 展开更多
关键词 debye model dielectric physicselectromagnetic em properties negative permittivitywhereas dielectric physicsdrude lorentzs models nd order Debye relaxation dielectric physics polarization mechanisms electromagnetic metasurfaces
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一种小型化人工表面等离激元传感系统——实现自适应和高灵敏的气体检测 认领 引用 被引量：2
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作者 Xuanru Zhang Jia Wen Zhu Tie Jun Cui 《Engineering》 SCIE EI CAS CSCD 2024年第4期86-94,共9页
Resonantly enhanced dielectric sensing has superior sensitivity and accuracy because the signal is measured from relative resonance shifts that are immune to signal fluctuations.For applications in the Internet of Thi... Resonantly enhanced dielectric sensing has superior sensitivity and accuracy because the signal is measured from relative resonance shifts that are immune to signal fluctuations.For applications in the Internet of Things(IoT),accurate detection of resonance frequency shifts using a compact circuit is in high demand.We proposed an ultracompact integrated sensing system that merges a spoof surface plasmon resonance sensor with signal detection,processing,and wireless communication.A softwaredefined scheme was developed to track the resonance shift,which minimized the hardware circuit and made the detection adaptive to the target resonance.A microwave spoof surface plasmon resonator was designed to enhance sensitivity and resonance intensity.The integrated sensing system was constructed on a printed circuit board with dimensions of 1.8 cm×1.2 cm and connected to a smartphone wirelessly through Bluetooth,working in both frequency scanning mode and resonance tracking mode and achieving a signal-to-noise ratio of 69 dB in acetone vapor sensing.This study provides an ultracompact,accurate,adaptive,sensitive,and wireless solution for resonant sensors in the IoT. 展开更多
关键词 Spoof surface plasmons Internet of Things Integrated sensing Resonance tracking Microwave sensing
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Artificial intelligence-assisted chiral nanophotonic designs 认领 引用 被引量：2
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作者 Xuanru Zhang Tie Jun Cui 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2023年第10期2-4,共3页
Chiral nanostructures can enhance the weak inherent chiral effects of biomolecules and highlight the important roles in chiral detection.However,the design of the chiral nanostructures is challenged by extensive theor... Chiral nanostructures can enhance the weak inherent chiral effects of biomolecules and highlight the important roles in chiral detection.However,the design of the chiral nanostructures is challenged by extensive theoretical simulations and explorative experiments.Recently,Zheyu Fang’s group proposed a chiral nanostructure design method based on reinforcement learning,which can find out metallic chiral nanostructures with a sharp peak in circular dichroism spectra and enhance the chiral detection signals.This work envisions the powerful roles of artificial intelligence in nanophotonic designs. 展开更多
关键词 chiral designs circular
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Fundamentals and applications of millimeter-wave and terahertz programmable metasurfaces 认领 引用 被引量：4
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作者 Xiaojian Fu Peng Wang +5 位作者 Yujie Liu Yuan Fu Qingdong Cai Yu Wang Silei Yang Tie Jun Cui 《Journal of Materiomics》 SCIE CSCD 2025年第1期240-254,共15页
Millimeter-wave and terahertz frequency bands are receiving more and more attention due to their big potentials for widespread applications such as in high-speed communications and high-resolution imaging.Nevertheless... Millimeter-wave and terahertz frequency bands are receiving more and more attention due to their big potentials for widespread applications such as in high-speed communications and high-resolution imaging.Nevertheless,limited by the functional materials and devices in these bands,we face lots of challenges towards high efficiency,high precision,and multi-domain electromagnetic manipulations that are urgently required in the practical application scenarios.The emergence of metasurfaces,especially the digital coding metasurfaces and programmable metasurfaces,has provided powerful capabilities to control electromagnetic waves.Recently,with the progress of space-domain,time-domain,space-time-domain,and polarization-domain programmable metasurfaces,considerable new applications have been achieved,including new-architecture wireless communication transmitters,the integration of sensing and communications,simultaneous information and power transfers,and information encryption.Consequently,integrated multifunctional platforms based on metasurfaces are expected.In this review,the recent advances in millimeter-wave and terahertz programmable metasurfaces are thoroughly presented,including the design principles and methods,the applications in the nextgeneration wireless communication systems,the integrated sensing and communications,and other multifunctional systems. 展开更多
关键词 Millimeter wave Terahertz wave Programmable metasurfaces Next-generation wireless communications Reconfigurable intelligent surfaces Integrated sensing and communications
A plasmonic meta-rotary travelling-wave oscillator with ultrahigh phase accuracy and figure of merit 认领 引用
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作者 Da Yue Yao Hao Chi Zhang +13 位作者 Pei Hang He Jia Jie Shen Jia Wen Zhu Peigen Zhou Xin Yu Zhang Le Peng Zhang Li Jie Wu Cun Yue Wei Rui Wen Shao Yi Fan Yang Zhao Jixin Chen Wei Hong Tie Jun Cui 《Light: Science & Applications》 SCIE EI CAS CSCD 2025年第10期3058-3068,共11页
High phase accuracy and figure of merit(FOM)of quadrature signals are essential for integrated systems,including quadrature amplitude modulation(QAM)communications and multi-input multi-output(MIMO)radar.However,the t... High phase accuracy and figure of merit(FOM)of quadrature signals are essential for integrated systems,including quadrature amplitude modulation(QAM)communications and multi-input multi-output(MIMO)radar.However,the traditional quadrature oscillators often struggle to meet the stringent requirements of high FOM and high quadrature phase accuracy simultaneously.To address this challenge,we propose a spoof surface plasmon polariton(SPP)metawaveguide(Meta)to design on-chip rotary traveling-wave oscillator(RTWO).By leveraging the advanced dispersion manipulation capability of Meta,the physical and electrical lengths of transmission line(TL)are effectively decoupled,thereby overcoming the limitations associated with the unequal electrical lengths of inner and outer loops of the resonator,which is difficult to achieve in the conventional RTWOs.Based on the design methodology,we realize a Meta-RTWO using the 65 nm CMOS technology and achieve a measured FOM of 188.5 dBc/Hz and a phase error of approximately 0.21°.These metrics surpass those of the traditional oscillators fabricated even by more advanced 28 nm CMOS processes.This study demonstrates that Meta-RTWO achieves a significant improvement in both output signal quadrature accuracy and FOM under process limitations without using additional phase adjustment structures. 展开更多
关键词 ultrahigh phase accuracy meta rotary travelling wave oscillator quadrature signals plasmonic figure merit quadrature amplitude modulation qam communications integrated systemsincluding quadrature oscillators
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An efficient design method of dual-polarized reconfigurable intelligent surface 认领 引用
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作者 Wanwan Cao Junwei Zhang +5 位作者 Junyan Dai Lijie Wu Hanqing Yang Zhen Zhang Huidong Li Qiang Cheng 《Chinese Optics Letters》 SCIE EI CAS CSCD 2025年第2期134-139,共6页
Dual-polarized reconfigurable intelligent surfaces(RISs)increasingly play significant roles in reshaping wireless transmission environments.In this Letter,we propose a design method for dual-polarized RIS elements.Thi... Dual-polarized reconfigurable intelligent surfaces(RISs)increasingly play significant roles in reshaping wireless transmission environments.In this Letter,we propose a design method for dual-polarized RIS elements.This proposed method develops an equivalent multiport model to quickly calculate reflection electromagnetic(EM)responses of the elements containing multiple structural parameters.Moreover,the genetic algorithm(GA)is utilized to optimize the structural parameters to meet design specifications.A 1-bit dual-polarized RIS is implemented for verification.The simulated and experimental results show good consistency with the calculated results.The proposed method significantly conserves design resources,promoting the development of dual-polarized RISs. 展开更多
关键词 dual-polarized reconfigurable intelligent surface multiport network optimization design wireless communication.
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On-chip signal isolation based on mode orthogonality in plasmonic dual-mode transmission line 认领 引用
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作者 Kai Lu Jiemin Wu +5 位作者 Chenchen Li Ming Wan Shiqi Zhang Hao Gao Di Bao Tie Jun Cui 《Chip》 EI CSCD 2026年第1期1-9,共9页
We proposed a spoof surface plasmon polariton(SSPP)dual-mode transmission line(DMTL)formed by mirror serpentine periodic structures(MSPSs),which features the odd-and even-mode dispersion curves overlapping in a wide f... We proposed a spoof surface plasmon polariton(SSPP)dual-mode transmission line(DMTL)formed by mirror serpentine periodic structures(MSPSs),which features the odd-and even-mode dispersion curves overlapping in a wide frequency range.With the mode exciter and mode recognizer in reciprocal form attached to both ends of SSPP DMTL,the two modes can be transmitted at the same time and their orthogonality was validated.An on-chip SSPP DMTL was implemented using the GaAs technology with a compact electrical dimension of 0.125*0.011*0.017λ3.The measured efficiencies of odd-and even-mode co-frequency signal transmissions were higher than−1.817 dB and−0.89 dB,respec-tively,while the degree of mode isolation was higher than 15 dB.The proposed SSPP DMTL doubles the communication capacity in a fixed frequency band and exhibits great potential in the com-posite communication systems. 展开更多
关键词 Dual-mode transmission line Spoof surface plasmon polaritons On-chip co-frequency transmission Communica-tion capacity
Frequency-modulated continuous waves controlled by space-time-coding metasurface with nonlinearly periodic phases 认领 引用 被引量：16
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作者 Jun Chen Ke Jun Yan Dai +10 位作者 Jun Wei Zhang Zhanye Chen Ming Zheng Chen Yunfeng Lu Lei Zhang Li Wang Qun Yan Zhou Long Li Jin Shan Ding Qiang Cheng Tie Jun Cui 《Light: Science & Applications》 SCIE EI CSCD 2022年第10期2424-2434,共11页
The rapid development of space-time-coding metasurfaces(STCMs)offers a new avenue to manipulate spatial electromagnetic beams,waveforms,and frequency spectra simultaneously with high efficiency.To date,most studies ar... The rapid development of space-time-coding metasurfaces(STCMs)offers a new avenue to manipulate spatial electromagnetic beams,waveforms,and frequency spectra simultaneously with high efficiency.To date,most studies are primarily focused on harmonic generations and independent controls of finite-order harmonics and their spatial waves,but the manipulations of continuously temporal waveforms that include much rich frequency spectral components are still limited in both theory and experiment based on STCM.Here,we propose a theoretical framework and method to generate frequency-modulated continuous waves(FMCWs)and control their spatial propagation behaviors simultaneously via a novel STCM with nonlinearly periodic phases.Since the carrier frequency of FMCW changes with time rapidly,we can produce customized time-varying reflection phases at will by the required FMCW under the illumination of a monochromatic wave.More importantly,the propagation directions of the time-varying beams can be controlled by encoding the metasurface with different initial phase gradients.A programmable STCM prototype with a full-phase range is designed and fabricated to realize reprogrammable FMCW functions,and experimental results show good agreement with the theoretical analyses. 展开更多
关键词 nonlinear continuous periodic
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Harmonic information transitions of spatiotemporal metasurfaces 认领 引用 被引量：6
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作者 Haotian Wu Xin Xin Gao +4 位作者 Lei Zhang Guo Dong Bai Qiang Cheng Lianlin Li Tie Jun Cui 《Light: Science & Applications》 SCIE EI CSCD 2020年第1期58-70,共13页
Facilitated by ultrafast dynamic modulations,spatiotemporal metasurfaces have been identified as a pivotal platform for manipulating electromagnetic waves and creating exotic physical phenomena,such as dispersion canc... Facilitated by ultrafast dynamic modulations,spatiotemporal metasurfaces have been identified as a pivotal platform for manipulating electromagnetic waves and creating exotic physical phenomena,such as dispersion cancellation,Lorentz reciprocity breakage,and Doppler illusions.Motivated by emerging information-oriented technologies,we hereby probe the information transition mechanisms induced by spatiotemporal variations and present a general model to characterize the information processing capabilities of the spatiotemporal metasurface.Group theory and abstract number theory are adopted through this investigation,by which the group extension and independent controls of multiple harmonics are proposed and demonstrated as two major tools for information transitions from the spatiotemporal domain to the spectra-wavevector domain.By incorporating Shannon’s entropy theory into the proposed model,we further discover the corresponding information transition efficiencies and the upper bound of the channel capacity of the spatiotemporal metasurface.The results of harmonic information transitions show great potential in achieving high-capacity versatile information processing systems with spatiotemporal metasurfaces. 展开更多
关键词 surface transitions surfaces
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Directly wireless communication of human minds via non-invasive brain-computer-metasurface platform 认领 引用 被引量：20
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作者 Qian Ma Wei Gao +13 位作者 Qiang Xiao Lingsong Ding Tianyi Gao Yajun Zhou Xinxin Gao Tao Yan Che Liu Ze Gu Xianghong Kong Qammer HAbbasi Lianlin Li Cheng‑Wei Qiu Yuanqing Li Tie Jun Cui 《eLight》 2022年第1期132-142,共11页
Brain-computer interfaces(BCIs),invasive or non-invasive,have projected unparalleled vision and promise for assisting patients in need to better their interaction with the surroundings.Inspired by the BCI-based rehabi... Brain-computer interfaces(BCIs),invasive or non-invasive,have projected unparalleled vision and promise for assisting patients in need to better their interaction with the surroundings.Inspired by the BCI-based rehabilitation technologies for nerve-system impairments and amputation,we propose an electromagnetic brain-computer-metasurface(EBCM)paradigm,regulated by human’s cognition by brain signals directly and non-invasively.We experimentally show that our EBCM platform can translate human’s mind from evoked potentials of P300-based electroencephalography to digital coding information in the electromagnetic domain non-invasively,which can be further processed and transported by an information metasurface in automated and wireless fashions.Directly wireless communications of the human minds are performed between two EBCM operators with accurate text transmissions.Moreover,several other proof-of-concept mind-control schemes are presented using the same EBCM platform,exhibiting flexibly-customized capabilities of information processing and synthesis like visual-beam scanning,wave modulations,and pattern encoding. 展开更多
关键词 communication computer surface
High-security nondeterministic encryption communication based on spin-space-frequency multiplexing metasurface 认领 引用 被引量：5
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作者 Shi Sun Yue Gou +1 位作者 Tie Jun Cui Hui Feng Ma 《PhotoniX》 SCIE EI 2024年第1期77-93,共17页
Information security plays an important role in every aspect of life to protect data from stealing and deciphering.However,most of the previously reported works were based on pure algorithm layer or pure physical laye... Information security plays an important role in every aspect of life to protect data from stealing and deciphering.However,most of the previously reported works were based on pure algorithm layer or pure physical layer encryptions,which have certain limitations in security.In this paper,a nondeterministic message encryption communication scheme is proposed based on a spin-space-frequency multiplexing metasurface(SSFMM),which integrates both algorithmic and physical layer encryptions,and can also produce multiple different ciphertexts for the same message to prevent the message from being cracked through frequency analysis,thus greatly enhancing the security of the information.To be specific,an SSFMM is first designed as a physical-layer meta-key,which can generate eight independent dot matrix holograms with different spin,space,and frequency characteristics.The target message is then encrypted based on these dot matrix holograms combined with algorithmic operations,and the encrypted message is converted into a quick response(QR)code for easy sending to the target users.Once the target user gets that QR code,he/she can scan it to obtain the encryption information,and then recover the target message according to the pre-agreed encryption protocol combined with the eight dot matrix holograms of SSFMM.Finally,the feasibility of the proposed encryption scheme was experimentally validated at the microwave frequency band. 展开更多
关键词 Spin-space-frequency multiplexing metasurface High-security Nondeterministic Encryption communication
Space-Time-Coding Digital Metasurfaces:Principles and Applications 认领 引用 被引量：21
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作者 Lei Zhang Tie Jun Cui 《Research》 SCIE EI CSCD 2021年第1期961-985,共25页
Space-time-modulated metastructures characterized by spatiotemporally varying properties have recently attracted great interest and become one of the most fascinating and promising research fields.In the meantime,spac... Space-time-modulated metastructures characterized by spatiotemporally varying properties have recently attracted great interest and become one of the most fascinating and promising research fields.In the meantime,space-time-coding digital metasurfaces with inherently programmable natures emerge as powerful and versatile platforms for implementing the spatiotemporal modulations,which have been successfully realized and used to manipulate the electromagnetic waves in both the spectral and spatial domains.In this article,we systematically introduce the general concepts and working principles of space-time-coding digital metasurfaces and provide a comprehensive survey of recent advances and representative applications in this field.Specifically,we illustrate the examples of complicated wave manipulations,including harmonic beam control and programmable nonreciprocal effect.The fascinating strategy of space-time-coding opens the door to exciting scenarios for information systems,with abundant applications ranging from wireless communications to imaging and radars.We summarize this review by presenting the perspectives on the existing challenges and future directions in this fast-growing research field. 展开更多
关键词 surfaces versatile directions
Simultaneous wireless information and power transfer transmitting architecture based on asynchronous space-time-coding digital metasurface[Invited] 认领 引用 被引量：3
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作者 祁振杰 戴俊彦 +8 位作者 王思然 周群焰 唐万恺 王凯岑 张澎 刘硕 李龙 程强 崔铁军 《Chinese Optics Letters》 SCIE EI CAS CSCD 2023年第8期17-22,共6页
Simultaneous wireless information and power transfer(SWIPT)architecture is commonly applied in wireless sensors or Internet of Things(IoT)devices,providing both wireless power sources and communication channels.Howeve... Simultaneous wireless information and power transfer(SWIPT)architecture is commonly applied in wireless sensors or Internet of Things(IoT)devices,providing both wireless power sources and communication channels.However,the traditional SWIPT transmitter usually suffers from cross-talk distortion caused by the high peak-to-average power ratio of the input signal and the reduction of power amplifier efficiency.This paper proposes a SWIPT transmitting architecture based on an asynchronous space-time-coding digital metasurface(ASTCM).High-efficiency simultaneous transfer of information and power is achieved via energy distribution and information processing of the wireless monophonic signal reflected from the metasurface.We demonstrate the feasibility of the proposed method through theoretical derivations and experimental verification,which is therefore believed to have great potential in wireless communications and the IoT devices. 展开更多
关键词 simultaneous wireless information and power transfer asynchronous space-time-coding digital metasurface quadrature phase-shift keying modulation
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Full-space programmable circularly polarized metasurface for space-multiplexing wireless communications 认领 引用 被引量：1
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作者 SEN ZHENG LEI ZHANG +8 位作者 YI NING ZHENG YUE GOU ZHENG XING WANG QIANG XIAO QIAN MA HAI LIN WANG ZHANG WEN CHENG TIE JUN CUI HUI FENG MA 《Photonics Research》 SCIE EI CAS CSCD 2024年第12期2794-2803,共10页
The programmable metasurface has been proved to be an effective tool to dynamically tailor electromagnetic(EM)waves.However,how to achieve real-time and independent controls of circularly polarized(CP)waves in the tra... The programmable metasurface has been proved to be an effective tool to dynamically tailor electromagnetic(EM)waves.However,how to achieve real-time and independent controls of circularly polarized(CP)waves in the transmission and reflection spaces is still a challenge.To address this problem,we propose a full-space programmable CP metasurface,which can independently manipulate the CP waves in transmission and reflection spaces in real time by controlling the bias voltage.The polarization states of reflected and transmitted CP waves can be independently customized through elaborate meta-atom design.As a proof of concept,we designed,fabricated,and measured a full-space programmable CP metasurface that can realize copolarized reflection for righthanded circularly polarized(RCP)waves and cross-polarized transmission for left-handed circularly polarized(LCP)waves.Simulated and measured results verify that the wavefronts of reflected and transmitted CP waves can be independently manipulated in real time by reprogramming the reflection and transmission phase coding sequences.Based on the full-space programmable CP metasurface,a space-multiplexing wireless communication scheme is established,successfully delivering two different images along preset reflection and transmission channels. 展开更多
关键词 polarized circular independently
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An externally perceivable smart leaky-wave antenna based on spoof surface plasmon polaritons 认领 引用 被引量：2
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作者 Weihan Li Jia Chen +6 位作者 Shizhao Gao Lingyun Niu Jiaxuan Wei Ruosong Sun Yaqi Wei Wenxuan Tang Tie Jun Cui 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2024年第9期5-20,共16页
Smart antennas have received great attention for their potentials to enable communication and perception functions at the same time.However,realizing the function synthesis remains an open challenge,and most existing ... Smart antennas have received great attention for their potentials to enable communication and perception functions at the same time.However,realizing the function synthesis remains an open challenge,and most existing system solutions are limited to narrow operating bands and high complexity and cost.Here,we propose an externally perceivable leakywave antenna(LWA)based on spoof surface plasmon polaritons(SSPPs),which can realize adaptive real-time switching between the“radiating”and“non-radiating”states and beam tracking at different frequencies.With the assistance of computer vision,the smart SSPP-LWA is able to detect the external target user or jammer,and intelligently track the target by self-adjusting the operating frequency.The proposed scheme helps to reduce the power consumption through dynamically controlling the radiating state of the antenna,and improve spectrum utilization and avoid spectrum conflicts through intelligently deciding the radiating frequency.On the other hand,it is also helpful for the physical layer communication security through switching the antenna working state according to the presence of the target and target beam tracking in real time.In addition,the proposed smart antenna can be generalized to other metamaterial systems and could be a candidate for synaesthesia integration in future smart antenna systems. 展开更多
关键词 smart antenna external perception spoof surface plasmon polaritons computer vision aids
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