Article
Materials Science, Multidisciplinary
Xufeng Wang, Xunjun He, Jiuxing Jiang, Yongtao Yao, Guangjun Lu
Summary: In this paper, a reflective hybrid graphene-metal coding metasurface is proposed for programmable manipulation of terahertz beams. The meta-atoms are composed of different C-shaped metallic split-ring resonators integrated with graphene, enabling different coding states through rotation and doping of graphene. The coding metasurfaces can achieve various functionalities including beam deflection, diffusive scattering, and vortex beam by changing the coding patterns. Dynamic reconfiguration is also possible by tuning the Fermi energy of graphene. The proposed coding metasurfaces have great potential in applications such as terahertz sensing, display, telecommunication, and imaging.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Xiaojian Fu, Lei Shi, Jun Yang, Yuan Fu, Chenxi Liu, Jun Wei Wu, Fei Yang, Lei Bao, Tie Jun Cui
Summary: This study develops a terahertz beam steering device using a liquid-crystal-integrated programmable metasurface. Numerical simulations and experiments demonstrate its phase control and beam steering capabilities.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Zhenkai Li, Chunyang Jiang, Kun Wang, Meng Liu, Chuanhao Li, Changdong Tian, Huiyun Zhang, Yuping Zhang
Summary: Multifunctional coding metasurfaces are a current research focus in highly integrated terahertz modulators. This study proposed a tunable chiral metasurface based on a Dirac semimetal (DSM) and demonstrated its multifunctional application in the terahertz region through coding. The chiral metasurface exhibited strong chirality and circular dichroism (CD) of up to 0.72 at 2.31 THz. By combining with the Pancharatnam-Berry (PB) phase, the metasurface enabled wideband switchable terahertz vortex beam generation, arbitrary angular deflection tuning, and multi-beam splitting. Switchable near-field imaging applications were also developed. The results have promising applications in terahertz high-data-capacity communication systems, multi-target information transmission, and controlled near-field imaging.
RESULTS IN PHYSICS
(2023)
Article
Optics
ZengLin Li, Wei Wang, Shaoxuan Deng, Jia Qu, Yuxiang Li, Bo Lv, Wenjia Li, Xi Gao, Zheng Zhu, Chunying Guan, Jinhui Shi
Summary: A VO2-integrated coding metasurface is proposed to achieve thermally controlled scattering-pattern shift through convolution operation. By changing the length of the VO2 cut-wires, the required phase profiles and high amplitudes can be easily obtained.
Article
Optics
Shuangqi Zhu, Bowen Dong, Guanxuan Guo, Xueguang Lu, Quan Xu, Jiaguang Han, Wanxia Huang, Hua Ma, Yongtian Wang, Xueqian Zhang, Lingling Huang
Summary: This paper proposes a dynamic THz metasurface combined with the phase-change material VO2 that can be thermally controlled for optical encryption. By arranging antennas in advance and utilizing the electromagnetically induced transparency effect, a secret image can be encoded into the metasurface. When the temperature exceeds the phase-change temperature, the encrypted hologram can be reconstructed. With the distinct characteristics of VO2, the phase-change temperature required for decryption is not very high, and the entire process is reversible. It is expected that such metasurfaces can be practically applied to the next generation of optical encryption or optical anticounterfeiting in the future with updated processing technology.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Ming Zhang, Najiao Zhang, Peng Dong, Lin Yang, Baozhu Wang, Ruihong Wu, Weimin Hou
Summary: With the rapid advancement of modern technology and radar detection systems, electromagnetic (EM) stealth technology has become increasingly significant, particularly in aircraft stealth and military radar applications. In this work, an all-metal metasurface is designed for broadband terahertz radar cross-section (RCS) reduction and infrared invisibility. The proposed method combines MATLAB and CST simulations with a genetic algorithm to optimize the random phase distribution of metasurfaces and achieve high performance. The results show that the metasurface can simultaneously achieve broadband terahertz RCS reduction and infrared invisibility in specific frequency ranges.
Article
Materials Science, Multidisciplinary
Zhengang Lu, Yunfei Liu, Yilei Zhang, Heyan Wang, Jiubin Tan
Summary: The conventional trial-and-error method in coding metasurfaces lacks theoretical guidance and is time-consuming and computationally expensive. This paper proposes an efficient design method for bisymmetric Pancharatnam-Berry (P-B) phase element patterns. The method derives the equivalent impedances of the element patterns and obtains the optimal geometric parameters using an equivalent circuit model. The simulation results demonstrate excellent backscattering energy homogenization performance in the 9.47-17.57 GHz band, with a radar-cross-section reduction (RCSR) of less than -10 dB.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Quan-Wei Lin, Hang Wong, Laure Huitema, Aurelian Crunteanu
Summary: The new coding metasurface integrates phase-change materials for optical control of terahertz wave propagation, effectively controlling beam tilting, directivity, and splitting with rich functionality. This technology has been successfully demonstrated and can be applied to more complex terahertz systems for imaging, sensing, and communication applications.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Jiashuai Xu, Wenwen Liu, Zhengyong Song
Summary: This paper presents a graphene-based coding metasurface for dynamic beam steering of terahertz waves, demonstrating its versatility in dynamically controlling electromagnetic waves. Experimental results verify the dynamic tunability of the proposed metasurface for various functionalities, showcasing its potential in terahertz wave applications.
IEEE PHOTONICS JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Yuehong Xu, Quan Xu, Xueqian Zhang, Xi Feng, Yongchang Lu, Xixiang Zhang, Ming Kang, Jiaguang Han, Weili Zhang
Summary: This study proposes a new design scheme using all-metal stereo U-shaped meta-atoms for efficient and broadband manipulation of terahertz polarization. The design is experimentally verified to demonstrate superior performance in polarization control and enriches the design freedom of polarization-related metasurfaces.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hui Li, Chenglong Zheng, Hang Xu, Jie Li, Chunyu Song, Jitao Li, Liang Wu, Fan Yang, Yating Zhang, Wei Shi, Jianquan Yao
Summary: This paper demonstrates an all-silicon metasurface that converts arbitrary incident polarization states to circular polarization states through mutual interference. The conversion intensities can be controlled using the behavior of polarization states defined on the Poincare sphere. The metasurface exhibits broadband circular dichroism and has potential applications in various fields.
Article
Nanoscience & Nanotechnology
Shan Yin, Yuting Chen, Baogang Quan, Songyi Liu, Wei Huang, Meng Liu, Wentao Zhang, Jiaguang Han
Summary: This paper demonstrates novel polarization-sensitive transmission effects in terahertz chiral metasurfaces. The asymmetrical transmission for circularly polarized state is observed in the chiral metasurfaces through circular cross-polarization conversion spectra and circular conversion dichroism (CCD). The chiroptical activities are found to be affected by the coupling between the wire and split ring resonator (SRR) in the terahertz metasurfaces.
Article
Chemistry, Multidisciplinary
Zhen Yue, Jingyu Liu, Jitao Li, Jie Li, Chenglong Zheng, Guocui Wang, Mingyang Chen, Hang Xu, Qi Wang, Xiaohua Xing, Yating Zhang, Yan Zhang, Jianquan Yao
Summary: This study introduces a novel technology based on dynamic phase and spatial interleaving unit arrangement for metasurfaces, enabling multiple wavefront manipulations including spin and linear polarization transformations. By designing a bifocal metasurface, various forms of wavefront manipulations can be achieved, offering a new platform for the development of terahertz integrated photonics.
Article
Materials Science, Multidisciplinary
Wanying Liu, Quanlong Yang, Quan Xu, Xiaohan Jiang, Tong Wu, Kemeng Wang, Jianqiang Gu, Jiaguang Han, Weili Zhang
Summary: The study investigates the implementation of terahertz mode and polarization division multiplexing using all-dielectric metasurfaces, which convert terahertz incidence with fundamental Gaussian mode into high-order HG modes while reducing beam divergence and spatially separating each mode through mode conversion and integration of phase distributions. The proposed multifunctional metasurfaces pave the way for potential applications of metasurface-based devices in terahertz communication systems.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Physics, Multidisciplinary
Yunping Qi, Baohe Zhang, Jinghui Ding, Ting Zhang, Xiangxian Wang, Zao Yi
Summary: This paper proposes a high-efficiency reflective-type coding metasurface that can manipulate the scattering pattern of terahertz waves and implement novel functionalities using the Pancharatnam-Berry (PB) phase concept. By optimizing coding sequences, the designed metasurfaces demonstrate strong control over reflected terahertz waves. The research provides a new degree of freedom for manipulating terahertz waves and contributes to the practical applications of metasurfaces.
Article
Engineering, Electrical & Electronic
Wei Liu, Jun Chen Ke, Cong Xiao, Lei Zhang, Qiang Cheng, Tie Jun Cui
Summary: A broadband polarization-reconfigurable converter (BPRC) based on active metasurfaces is proposed, which can achieve polarization-reconfigurable conversion for both linear-polarization (LP) and circular-polarization (CP) incident waves in wide bands by changing the states of p-i-n diodes. The BPRC consists of three-layer metal patches, three-layer dielectric substrates, and p-i-n diodes. The conversion ratio is higher than -1 dB in the frequency range of 7.4-12 GHz, with a relative bandwidth of 47.4%.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Multidisciplinary Sciences
Bruno Piccirillo, Domenico Paparo, Andrea Rubano, Antonello Andreone, Marcello Rossetti Conti, Dario Giove, Veronica Vicuna-Hernandez, Can Koral, Maria Rosaria Masullo, Giovanni Mettivier, Michele Opromolla, Gianpaolo Papari, Andrea Passarelli, Giuseppe Pesce, Vittoria Petrillo, Ester Piedipalumbo, Marcel Ruijter, Paolo Russo, Luca Serafini
Summary: In this work, a liquid crystal-based modular and extendable platform is proposed for studying materials by analyzing polarization and wavefront of light. This platform will be driven by the future THz-FEL source TerRa@BriXSinO, which produces high power radiation in the THz-range. Liquid crystal-based geometric phase components have been fabricated to optimize the source's potential for accurately determining polarization- and wavefront-sensitive properties of materials. This platform allows characterizing various properties of materials and can add orbital angular momentum for investigating chiral agents' properties using nonlinear optics techniques.
Article
Physics, Applied
Xiao Qing Chen, Lei Zhang, Tie Jun Cui
Summary: A physics-driven vector-quantized intelligent autoencoder model is proposed for fast and accurate generation of optimized discrete STC matrices based on desired harmonic scattering patterns. It enhances the practicality and versatility of STC digital metasurfaces.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Gian Paolo Papari, Vladimir M. M. Fomin
Summary: The origin of the parabolic background in magnetoresistance oscillations measured in superconducting mesoscopic rings and patterned films is analyzed. The transmission model is extended to address the parabolic background as a function of the magnetic field. Superconducting vortices as topological defects introduce interference-based distribution of supercurrents that affects the measured quasiparticles.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Chemistry, Analytical
Zahra Mazaheri, Gian Paolo Papari, Antonello Andreone
Summary: Using a customized time-domain ellipsometer operating in the THz range, the molecular dynamics of a liquid binary solution based on water and isopropyl alcohol (2-propanol) is investigated. The setup can detect small changes in the optical properties of the mixture in a single measurement. The complex dielectric response of samples with different concentrations is studied through direct measurement of the ellipsometric parameters. The deviations between experimental data and theoretical expectations at an intermediate volume percentage of 2-propanol in water are attributed to competing effects: the creation/destruction of hydrogen bonding and the presence of cluster/aggregation between water and alcohol molecules.
Article
Materials Science, Multidisciplinary
Wei Liu, Lei Zhang, Jun Chen Ke, Jing Cheng Liang, Jun Yan Dai, Qiang Cheng, Tie Jun Cui
Summary: This article introduces a transmissive metasurface that can manipulate both the polarization and phase of electromagnetic waves. It has the ability to rotate the polarization of linearly polarized waves to any desired azimuth direction and achieve cross-polarization conversion for circularly polarized waves.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Massimo Moccia, Giuseppe Castaldi, Andrea Alu, Vincenzo Galdi
Summary: Leaky waves are complex eigenmodes that can simulate radiative phenomena in open waveguiding structures. This study introduces a flatland analog of leaky-wave radiation to describe a novel mechanism for in-plane radiation leakage in low-dimensional materials. The study develops a semi-analytical model and illustrates possible platforms for its physical realization. The results provide a new tool for manipulating surface waves at the nanoscale and can have applications in the field of polaritonics.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Analytical
Anna Lucia Pellegrino, Francesca Lo Presti, Gian Paolo Papari, Can Koral, Antonello Andreone, Graziella Malandrino
Summary: The fine control of crystal habit of vanadium dioxide has been achieved through an in-depth study of MOCVD synthetic approach. The compositional purity, morphology, and thickness of VO2 films have been assessed through EDX analyses and FE-SEM. The functional properties of the as-prepared VO2 films have been validated using THz time domain spectroscopy.
Article
Optics
Can Koral, Zahra Mazaheri, Antonello Andreone
Summary: This paper presents the design, fabrication, and experimental test of a THz all-dielectric phase shifter plate. The design consists of two wave plate zones coupled in a perpendicular orientation with good uniformity on a large surface area. The proposed design enables the creation of quasi-ideal phase retardation and offers a sensitive control over the electromagnetic field polarization direction.
Proceedings Paper
Engineering, Electrical & Electronic
Massimo Moccia, Giuseppe Castaldi, Lei Zhang, Vincenzo Galdi, Tie Jun Cui
Summary: Space-time-coding digital metasurfaces offer significant potential for advanced field manipulations in the joint space-frequency-polarization domain, and for overcoming limitations in linear and time-invariant electromagnetic systems.
2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP
(2023)
Article
Optics
Gian Paolo Papari, Jijil J. J. Nivas, Meilin Hu, Salvatore Amoruso, Antonello Andreone
Summary: Realistic lumped-element circuits are used to describe split-ring resonator metasurfaces and their complementary forms. By considering the symmetry of the meta-atoms with respect to the impinging electric field, the polarization dependence is taken into account. This approach allows for the description of circuital architectures in real metasurfaces, including the effect of Ohmic dissipation. The lumped-element models provide a simple way to describe features like enhanced transmission and deep absorption observed in metasurfaces and complementary metasurfaces based on split-ring resonators.
