Article
Multidisciplinary Sciences
Yangyang Chen, Xiaopeng Li, Colin Scheibner, Vincenzo Vitelli, Guoliang Huang
Summary: Mechanical metamaterials exhibit unique properties not found in ordinary materials, such as active metamaterials with self-sensing characteristics demonstrated by the authors. These active metamaterials can convert electrical energy into mechanical work, and their odd modulus allows for localized vibrational modes at sample boundaries.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Jiaruo Yan, Anna Radkovskaya, Laszlo Solymar, Chris Stevens, Ekaterina Shamonina
Summary: We demonstrate the switchable unidirectional propagation of slow waves in a metamaterial array using strongly coupled elements. The direction of propagation of the waves is determined by the dispersion relations, and we have shown that this phenomenon is not limited to magnetoinductive waves. By generalizing our method to a diatomic magnetoinductive array, we achieve switchable unidirectional signal propagation with distinct frequency bands. Furthermore, we extend our technique to a 2D metasurface, enabling selective directional control of waves in two dimensions.
SCIENTIFIC REPORTS
(2022)
Article
Biochemical Research Methods
Manuel J. Freire, Ricardo Marques, Jesus Tornero
Summary: This work investigates the homogenization of the inherently inhomogeneous transmit field B+1 in a 7 T birdcage through the use of metasurfaces. The metasurfaces consist of a two-dimensional planar array of capacitively loaded conducting rings and are placed in the intermediate space between the head and the birdcage. The analysis takes advantage of the mutual inductive coupling existing between the elements of the array, which allows for the excitation of a standing magnetoinductive wave across the arrays and contributes to locally homogenize the field of the birdcage. The presence of the arrays does not detune the birdcage, making them compatible with commercial birdcages that operate both to transmit and receive.
JOURNAL OF MAGNETIC RESONANCE
(2023)
Article
Chemistry, Physical
Jin Zhang, Zhenfei Li, Linda Shao, Fajun Xiao, Weiren Zhu
Summary: The study demonstrates the active modulation of EIT analog by integrating graphene into a microwave metamaterial for the first time, showing that the EIT peak can be dynamically controlled under a relatively low bias voltage applied on graphene. The continuous tuning of the EIT resonance strength is achieved by variably dampening the dark resonator using graphene.
Article
Multidisciplinary Sciences
Curtis Rasmussen, Andrea Alu
Summary: The efficiency and bandwidth of traditional passive acoustic radiators are severely limited, but these constraints can be overcome by loading a piezoelectric transducer with a non-Foster active circuit, resulting in significantly improved radiation bandwidth and efficiency. Experimental results demonstrate a threefold increase in bandwidth, paving the way for non-Foster acoustic radiation technologies.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Review
Nanoscience & Nanotechnology
Kebin Fan, Richard D. Averitt, Willie J. Padilla
Summary: Metamaterials enable subwavelength tailoring of light-matter interactions, driving fundamental discoveries and applications in various fields. By incorporating responsive materials into metamaterials, dynamic properties can be achieved, leading to the development of active and tunable devices. Active control can be achieved by modifying the electronic or optical properties of the responsive materials, allowing for reconfigurable or real-time control of light. The wide range of examples presented in this field showcases the potential impact of active and tunable nanophotonic metamaterials in areas such as holography, communications, imaging, and quantum sensing.
Article
Engineering, Multidisciplinary
Michal Nowicki, Roman Szewczyk, Igor Korobiichuk
Summary: A magnetoelastic tensile force sensor utilizing the magnetoinductive effect is proposed, which is simple to use and has a high gauge factor. By measuring magnetic and magnetoelastic parameters and performing finite element method simulations, good agreement with experimental results was obtained.
Article
Mechanics
Francesco Trentadue, Gianluca Caramia, Domenico De Tommasi, Nicola Marasciuolo, Gennaro Vitucci
Summary: In this study, a plane metamaterial is braced by crossing cables to enhance its stability performance. Analytical solutions for critical modes and stability domain are obtained using the Bloch wave approach and validated by numerical simulations. The experimental response of a specimen further confirms the accuracy of the analytical model. This research bears significance in tailoring the buckling response of new metamaterials under plane stress states.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Optics
J. I. A. N. Z. H. O. U. Huang, Bin Hu, G. U. O. C. U. Wang, Z. O. N. G. Y. U. A. N. Wang, J. I. N. L. O. N. G. LI, J. U. A. N. Liu, Y. A. N. Zhang
Summary: This work demonstrates a reconfigurable THz phase modulator with 5x5 independently tunable units enabled by switching the voltages applied on 10 graphene ribbons. The efficiency of the device is enhanced by 2.7-3.6 times under different graphene chemical potentials through introducing quasi bound states in the continuum resonance using a designed double C-shaped antenna. Experimental results show the formation of a focus with a changed focal length from 14.3mm to 22.6mm. This work provides potential for compact THz spatial light modulators that may be applied in THz communication, detection, and imaging.
PHOTONICS RESEARCH
(2023)
Article
Engineering, Mechanical
Marin Jalsic, Neven Alujevic, Tonko Garma, Ivan Catipovic, Marko Jokic, Hinko Wolf
Summary: This study focuses on the conceptual development and experimental validation of a control system that induces nonreciprocal transmission of sound. The results show promising potential for designing an active acoustic metamaterial that can significantly alter the transmission of sound based on its direction of entry.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Yuan Tao, Wang Guoyi, Y. U. Xingguo, Ronaldo Juanatas, Zhang Xiuzai
Summary: This paper introduces an EM metasurface based on Ge2Sb2Te5 (GST) layer, and verifies its transmission window can be selected and switched by adjusting the structural parameters and annealing temperature, and it has high sensitivity to liquids.
Article
Materials Science, Multidisciplinary
Shubhi Bansal, Sriram Subramanian
Summary: While acoustic metamaterials face challenges with limited tunability and narrow operational frequency range, integrating liquids with active actuation mechanisms in metamaterials opens up new design possibilities. The use of active microfluidic techniques enables active tunability in liquid-embedded metamaterial designs, leading to the development of a novel class of microfluidic acoustic metamaterials (MAM) with deep-subwavelength ultra-compact tunable features and multi-stable characteristics. MAM demonstrates active acoustic switching, amplitude modulation, and phase modulation with high transmission efficiency and broadband operations, paving the way for automation, tuning, and miniaturization of metamaterials using microelectromechanical (MEMS) and microfluidic concepts.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Engineering, Electrical & Electronic
Vigyanshu Mishra, Asimina Kiourti
Summary: This article introduces an indirect method for solving the dispersion equation of magnetoinductive waveguides, which provides additional information and insights for understanding and designing MIWs.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2022)
Article
Materials Science, Multidisciplinary
Han Jing, Zhong Min
Summary: Electromagnetically induced transparency (EIT) effect provides a vast space for the development of new optical devices. This study proposes and verifies an all-dielectric metamaterial based on the EIT effect. The amplitude and resonant frequency of the transmission window can be actively controlled, and the group delay can be switched. The frequency selectivity can be achieved by changing the diameter of the silicon array, and the resonant frequency can be shifted by immersing the sample in oil with different refractive indices. The metamaterial sample shows potential applications in various fields such as light buffering, 6G/terahertz communications, and ultrafast devices.
Article
Engineering, Aerospace
Zhigang Wang, Qi Wu, Yifei Lu, Panpan Bao, Yu Yang, Daochun Li, Xiasheng Sun, Jinwu Xiang
Summary: This paper proposes a distributed morphing lattice structure based on variable geometry digital metamaterials, which enables distributed morphing ability and improves the performance of aircraft. By optimizing the combination sequence of the lattice structure and the input of actuators, the outer surface can morph into the desired aerodynamic contour.
Article
Engineering, Electrical & Electronic
Qiao Cheng, Yang Hao, Jack McGhee, William G. Whittow, J. C. Vardaxoglou, Raj Mittra, Shiyu Zhang
Summary: This article proposes a broadband dual circularly polarized reflectarray based on 3-D printed dielectric materials. By adjusting the phases of the orthogonal LP waves and optimizing the feed placement, a wide bandwidth and high gain are achieved.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Multidisciplinary Sciences
Lucas Teoh, Achintha Avin Ihalage, Srooley Harp, Zahra F. Al-Khateeb, Adina T. Michael-Titus, Jordi L. Tremoleda, Yang Hao
Summary: Early detection of traumatic brain injuries is crucial for patient prognosis and survival. This study explores the use of a multiple input, convolutional neural network and LSTM integrated architecture for traumatic injury detection in a murine preclinical model dataset. The proposed deep learning model achieved the best performance and showed promise in detecting brain trauma in mice.
Article
Physics, Applied
Xiangdong Meng, Ruixuan Liu, Hongchen Chu, Ruwen Peng, Mu Wang, Yang Hao, Yun Lai
Summary: This study proposes a scheme of through-wall wireless communication using purposely designed passive metalenses. The metalenses can efficiently focus incoming waves to the other side of the wall, significantly enhancing wireless signal strength. By demonstrating its application in the 5GHz Wi-Fi environment, the study shows that the metalenses can reconnect broken network channels due to weak signal strength and significantly increase data transmission rates. This research provides an effective solution for wireless communication in future eco-friendly buildings.
PHYSICAL REVIEW APPLIED
(2022)
Article
Engineering, Electrical & Electronic
Ahsan Noor Khan, Alexey V. Ermakov, Theo Saunders, Henry Giddens, David Gould, Gleb Sukhorukov, Yang Hao
Summary: Implantable drug delivery devices have become an essential platform for treating chronic diseases that require enhanced and localized drug concentrations. This article presents micrometer-sized chambers fabricated using a patterned film base for array formation. These microchambers, made from a polylactic acid matrix and modified with conducting species, show potential for thermal therapy and drug delivery in response to electromagnetic radiations.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Cheng-Xiang Wang, Zhen Lv, Xiqi Gao, Xiaohu You, Yang Hao, Harald Haas
Summary: This paper proposes a pervasive wireless channel modeling theory that can integrate important channel characteristics at different frequency bands and scenarios. It further applies the theory to a 3D space-time-frequency stochastic model for 6G wireless communication systems. The proposed model can accurately characterize channels for various frequency bands and scenarios.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Mathematics
Benjamin Vial, Yang Hao
Summary: Technological advances in nanofabrication have opened up new applications in nanophotonics, but rigorous and efficient numerical methods are needed. Tremendous advances in algorithmic differentiation have made large-scale optimization of devices possible with minor modifications to the underlying code. Researchers have developed three software libraries for solving Maxwell's equations in different contexts and demonstrate inverse design examples.
Article
Engineering, Electrical & Electronic
Khaleda Ali, Alessio Brizzi, Ahsan Noor Khan, Yang Hao
Summary: This article presents an analysis of on-body radio channels at millimeter-wave frequencies and proposes solutions to reduce the path loss, particularly at non-line of sight (NLoS) locations. The study conducted at 94 GHz reveals that the presence of textile and thin air between clothing and the human body surface can lower the path loss at NLoS. Additionally, attaching a thin metallic sheet underneath clothing further reduces the path loss.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Chemistry, Inorganic & Nuclear
Hangfeng Zhang, A. Dominic Fortes, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: In this study, a new type of material with antiferroelectric characteristics has been reported, despite having a polar crystal structure. The material exhibits double polarization-electric field hysteresis loops over a wide range of electric field and temperature, which is different from previous observations. The study also reveals the phase transitions and structural changes in the material, and confirms its stable dielectric performance in the microwave frequency range.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Yubei He, Cheng-Xiang Wang, Hengtai Chang, Rui Feng, Jian Sun, Wensheng Zhang, Yang Hao, El-Hadi M. Aggoune
Summary: In this paper, a 3-dimensional non-stationary geometry-based stochastic model is proposed for maritime massive MIMO communication systems. A novel beam domain channel model is then proposed, which transforms the corresponding stochastic model from the array domain to the beam domain. Two methods are used to characterize the array non-stationarity, and important channel statistical properties are studied and compared based on the proposed models.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Parvathy Chittur Subramanianprasad, Yihan Ma, Achintha Avin Ihalage, Yang Hao
Summary: The design of metasurface arrays to minimize radar cross-section has been extensively studied. The use of conventional optimization algorithms such as genetic algorithm and particle swarm optimization presents a challenge in terms of computation time, especially for large arrays. This study proposes the application of active learning, a machine learning optimization technique, to significantly speed up the optimization process and obtain similar results compared to genetic algorithm. The active learning strategy outperforms genetic algorithm in terms of computational efficiency, particularly for larger metasurface arrays.
Review
Engineering, Electrical & Electronic
Young-Ok Cha, Achintha Avin Ihalage, Yang Hao
Summary: The past century has seen significant progress in antennas and propagation (A&P) research, bringing about major changes to society and technology. In this article, a natural language processing (NLP) and machine learning (ML) approach is introduced to review A&P research based on large-scale unstructured data, providing meaningful summaries and predictions. Through analyzing 159,000 research papers published between 1981 and 2021, and applying an encoder-decoder LSTM network with integrated attention mechanism, future trends in A&P research are predicted in the form of a Gartner's hype cycle.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Nanoscience & Nanotechnology
Benjamin Vial, Sebastien Guenneau, Yang Hao
Summary: We propose an optimization approach for designing wideband thermal cloaks for objects with large thermal conductivity. The cloak achieves near-perfect cloaking over a finite frequency band and performs well in the time domain, regardless of the initial temperature distribution. Interestingly, it also works fairly well for objects with high thermal conductivity but breaks down for those with low thermal conductivity.
Article
Materials Science, Multidisciplinary
Yihan Ma, Jonas Florentin Kolb, Achintha Avin Ihalage, Andre Sarker Andy, Yang Hao
Summary: Surface symmetry breaking and disorder have been utilized to address issues such as operation bandwidth, unwanted diffraction, and polarization dependence in metasurface designs. However, efficient simulation and optimization of large-scale electromagnetic structures remains challenging. This study presents an interactive learning approach to build meta-atom datasets with mutual coupling effects. A deep learning-based model extracts features from limited known meta-atoms to design aperture-efficient metasurfaces and metalenses at large scales.
ADVANCED PHOTONICS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Mohsen Khalily, Okan Yurduseven, Tie Jun Cui, Yang Hao, George Eleftheriades
Summary: Surface electromagnetics (SEM), as a sub-discipline of electromagnetic (EM) science, focuses on manipulating electromagnetic waves for controlling reflection, refraction and transmission. SEM has gained significant attention and usage in applications involving microwave, millimeter-wave, terahertz and optical wavelengths.
IEEE COMMUNICATIONS MAGAZINE
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Benjamin Vial, Henry Giddens, Yang Hao
Summary: This paper presents two examples of electromagnetic lenses that demonstrate the advantages of multi-material 3D printing. The first example is a frequency dependent dual focusing lens design using two different dielectric filaments. The second example is a compressed Luneburg lens realized by printing with a total of five different dielectrics.
2022 16TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2022)
