Article
Chemistry, Multidisciplinary
Xiang Wan, Jia Wei Wang, Zi Ai Huang, Bai Yang Li, Qiang Xiao, Tie Jun Cui
Summary: The study demonstrates the foundation of space-time-frequency joint controls of EM waves using digital programmable metasurfaces. Through the analysis of monochromatic or nonmonochromatic EM waves based on the Huygens-Fresnel principle and Fourier analysis, the decoupling of space- and time-frequency modulations enables independent controls over the EM waves in terms of space, time, and frequency.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Sizhe Gao, Hui Ma, Shaopeng Wei, Hongwei Liu, Guoqiang Wang
Summary: This paper proposes a single-channel real-aperture 3D imaging method based on digital coding metasurface, which utilizes sparse reconstruction to obtain the target scene and addresses the issue of signal coupling to improve reconstruction accuracy.
IEEE TRANSACTIONS ON COMPUTATIONAL IMAGING
(2022)
Article
Nanoscience & Nanotechnology
Liang Wei Wu, Hui Feng Ma, Yue Gou, Rui Yuan Wu, Zheng Xing Wang, Qiang Xiao, Tie Jun Cui
Summary: This paper proposes a multiband bidirectional digital coding metasurface that can achieve different functions in up to six frequency bands. By designing and fabricating different metasurfaces, functions such as reflection, transmission, holographic imaging, and vortex-beam forming are achieved. The simulated and measured results confirm the good performance of the proposed metasurface.
Article
Optics
Chunyang Jiang, Zhenkai Li, Xinyu Lv, Meng Tian, Meng Liu, Huiyun Zhang, Yuping Zhang
Summary: Coding metasurfaces have rapidly developed in recent years due to digital thought. Spatiotemporal metasurfaces have gained significant attention for their additional degrees of freedom in manipulating electromagnetic waves in space and time domains. This study proposes Dirac semimetal based space-time-coding metasurfaces in the terahertz band, which enable wide-band terahertz vortex beam generation and achieve precise modulation. The results are expected to have promising applications in terahertz high-data-capacity communication systems and multi-target precision tracking and guidance.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Xin Wang, Jiaqi Han, Shuncheng Tian, Dexiao Xia, Long Li, Tie Jun Cui
Summary: The article introduces a novel amplifier-based transmissive space-time-coding metasurface which enables strong nonlinear control of electromagnetic waves in both space and frequency domains. By utilizing unilateral power amplifiers, the metasurface can manipulate the propagation directions of nonlinear harmonic waves, breaking Lorentz reciprocity. Through cascading power amplifiers between patches on two sides of the metasurface, spatial electromagnetic waves can be transmitted in the forward direction while being blocked in the backward direction.
Article
Optics
Zhen Jie Qi, Jun Yan Dai, Si Ran Wang, Qun Yan Zhou, Wankai Tang, Kaicen Wang, Peng Zhang, Shuo Liu, Long Li, Qiang Cheng, Tie Jun Cui
Summary: 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. The feasibility of the proposed method is demonstrated through theoretical derivations and experimental verification, indicating its great potential in wireless communications and IoT devices.
CHINESE OPTICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Fei Yang, Fan Xu, Chenxi Liu, Xinyu Yang, Ziqiang Wang, Junwei Wu, Xiaojian Fu
Summary: This article proposes a compact programmable coding metasurface with PIN diodes for beam steering in the Ka band. The simulation and experimental results validate the performance of the metasurface and demonstrate its potential applications in sensing and wireless communications. This novel metasurface offers greater flexibility and integration, providing new insights for the development of millimeter wave technology.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Dexiao Xia, Lei Guan, Haixia Liu, Yajie Mu, Xin Wang, Jiaqi Han, Yan Shi, Long Li
Summary: This article proposes MetaBreath, a multitarget and high-resolution respiration detection method based on space-time-coding (STC) digital metasurface. By exploiting the harmonics generated by STC digital metasurface, the respiration detection is modeled as a blind source separation problem and solved using independent component analysis (ICA). Experimental results demonstrate that MetaBreath enables respiration detection and separation in both separate and close scenarios, achieving superior performance compared to state-of-the-art methods. With its low complexity and high practicality, MetaBreath has potential applications in sleeping monitoring, life detection, and baby care.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Chemistry, Multidisciplinary
Si Ran Wang, Ming Zheng Chen, Jun Chen Ke, Qiang Cheng, Tie Jun Cui
Summary: Recent progress in space-time-coding digital metasurface (STCM) has demonstrated its power in controlling electromagnetic wave properties in both space and time domains. A new asynchronous STCM is proposed, where meta-atoms are modulated by different time-coding periods. This asynchronous STCM allows for dynamic wavefronts and shows potential for applications in radars and wireless communications.
Article
Optics
Haoliang Cheng, Bo Fang, Wenkang Huang, Ruisi Li, Changyu Shen, Lan Ke, Xufeng Jing, Chenxia Li, Zhi Hong
Summary: Programmable metasurfaces based on row-column encoding are proposed to achieve dynamic control of electromagnetic waves. By controlling the on-off states of diodes, a 180 degrees phase change and high reflectivity can be achieved. Experimental results confirm the beam scanning function of the designed programmable metasurface at a specific frequency.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Xuchen Wang, Mohammad Sajjad Mirmoosa, Viktar S. Asadchy, Carsten Rockstuhl, Shanhui Fan, Sergei A. Tretyakov
Summary: Photonic time crystals are artificial materials with spatially uniform but temporally varying electromagnetic properties. This study extends the concept of photonic time crystals to two-dimensional artificial structures called metasurfaces. By designing a microwave metasurface, the researchers confirmed the existence of momentum bandgaps and exponential wave amplification, demonstrating the potential of metasurfaces as a material platform for emerging photonic space-time crystals and for amplifying surface-wave signals in wireless communications.
Article
Chemistry, Multidisciplinary
Hai Lin Wang, Hui Feng Ma, Mao Chen, Shi Sun, Tie Jun Cui
Summary: A reconfigurable multifunctional metasurface is proposed in this paper, which demonstrates real-time control of transmission, absorption, and reflection of electromagnetic waves, as well as independent control of vertical and horizontal polarized waves, with broad application potential.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Liang Wei Wu, Qiang Xiao, Yue Gou, Rui Yuan Wu, Peng Xu, Ye Ming Qing, Zheng Xing Wang, Lei Bao, Hui Feng Ma, Tie Jun Cui
Summary: In this study, a reflection-transmission reconfigurable digital coding metasurface is proposed, which can switch between reflection and transmission working states and integrate the functionalities of EM diffusion and encrypted holography.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Senfeng Lai, Guiyang Liu, Yanpei Guo, Yang Liu
Summary: In this paper, a metamaterial absorber with a checkerboard patterned ITO film surface is designed using flexible and optically transparent wave-absorbing material ITO-PET. The absorber shows excellent performance with high absorptance, high transmittance, and reduction in radar cross-section. It also has the advantages of polarization insensitivity and angular stability.
Article
Chemistry, Multidisciplinary
Yujie Liu, Yu Wang, Xiaojian Fu, Lei Shi, Fei Yang, Jiang Luo, Qun Yan Zhou, Yuan Fu, Qi Chen, Jun Yan Dai, Lei Zhang, Qiang Cheng, Tie Jun Cui
Summary: This article proposes a space-time coding metasurface (STCM) operating in the sub-terahertz band for constructing new-architecture wireless communication systems. The STCM is designed to have varactor-diode-tuned elements, allowing precise regulation of harmonic amplitudes and phases. It achieves independent electromagnetic regulations in the space and time domains, enabling flexible beam manipulations and information modulations. Experimental results demonstrate its capability in supporting multiple modulation schemes and wide-angle beam scanning. The STCM transmitter with high device density and low power consumption can provide low-complexity, low-cost, low-power, and low-heat solutions for building the next-generation wireless communication systems.
