Article
Chemistry, Analytical
Lukas Malena, Ondrej Fiser, Paul R. Stauffer, Tomas Drizdal, Jan Vrba, David Vrba
Summary: The study investigates the potential of using microwave technology for non-invasive estimation of blood glucose levels, with MTM sensors showing higher sensitivity compared to MSTL sensors, especially in response to changes in glucose concentration. Experimental and numerical simulations demonstrate that MTM sensors with nine unit cells exhibit the highest sensitivity, highlighting their potential for evaluating human blood samples.
Article
Materials Science, Composites
Tuo Zhang, Yuping Duan, Jiangyong Liu, Huifang Pang, Lingxi Huang, Xinran Ma, Yupeng Shi, Ben Ma
Summary: This study reports hierarchical metamaterials constructed from pyramid metastructure composites and Fibonacci spiral elements, with a wide effective absorption bandwidth. The use of multi-scale optimization and metastructure design is effective in improving multiple resonance thickness and wavefront transmission. The hybrid absorber exhibits robustness with incident angle across transverse magnetic polarization.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Han-Qing Dong, Cheng-Jing Gao, Hai-Feng Zhang
Summary: An electromagnetically induced transparency metamaterial based on dielectric resonators is proposed in this paper. The metamaterial has advantages such as high efficiency, low loss, a simple structure, and ease of manufacture, making it promising for applications in various fields. The simulation and experimental results confirm the effectiveness of the metamaterial.
ANNALEN DER PHYSIK
(2023)
Article
Materials Science, Ceramics
Pei Wu, Hongyu Yang, Hongcheng Yang, Ling Gui, Yuchen Wang, Qian Liu, Enzhu Li
Summary: In this study, BaSi2O5 ceramics with an orthorhombic structure were successfully synthesized by doping with LBCC glass. The mechanism of low-temperature sintering and the microwave dielectric properties of BaSi2O5 ceramics were investigated. The doping of LBCC glass reduced the sintering temperature of BaSi2O5 and demonstrated good chemical compatibility with silver at a certain doping percentage.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Yufei Zhang, Wenrong Yang, Xiaonan Li, Guoqiang Liu
Summary: In this article, a broadband metamaterial absorber suitable for the S, C, and X bands is designed and manufactured. The absorber achieves more than 90% broadband absorption between 2.7 GHz and 12.7 GHz, has good polarization and incidence angle insensitivity, and uses electromagnetic resonance to explain its absorption characteristics. The proposed absorber has higher absorption and simpler construction than previous designs, making it a potential solution for practical applications in EMC, radar, and electromagnetic protection.
IEEE PHOTONICS JOURNAL
(2023)
Article
Multidisciplinary Sciences
Sichao Qu, Yuxiao Hou, Ping Sheng
Summary: By introducing metallic ring structural dipole resonances in the micro-wave regime, a metamaterial absorber with hierarchical structures has been designed and realized to achieve high absorption rates and efficiency. The absorber shows improved performance in terms of absorption, bandwidth, and thickness.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
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
Physics, Applied
Ningfeng Bai, Fuxian Zhong, Jingxuan Shen, Hehong Fan, Xiaohan Sun
Summary: This paper proposes a thermal-insensitive ultra-broadband metamaterial absorber (MMA) based on ITO patterns and SiO2 dielectric substrate. The simulation results demonstrate significant achievements in stability and absorbability, making it suitable for high-temperature environments.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Review
Physics, Multidisciplinary
Yadgar I. Abdulkarim, Ayesha Mohanty, Om Prakash Acharya, Bhargav Appasani, Mohammad S. Khan, S. K. Mohapatra, Fahmi F. Muhammadsharif, Jian Dong
Summary: Metamaterials are artificially designed materials that possess unique properties due to their geometrical design, such as negative refractive index and left-handed behavior. Metamaterial absorbers, made up of metallic patterns and dielectric layers, achieve high electromagnetic wave absorption through various mechanisms.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Multidisciplinary
Mengchao Guo, Xiaokun Wang, Haiyan Zhuang, Dongming Tang, Baoshan Zhang, Yi Yang
Summary: In this study, a dual-band low-permittivity all-dielectric metamaterial absorber (ADMMAs) was designed and fabricated using 3D printing. The simulation and experimental results showed that 3D printing is a better alternative for the fabrication of low-permittivity ADMMAs, and the absorption peaks of the absorber are highly sensitive to the surrounding environment.
Article
Physics, Applied
Atanu K. K. Saha, Mengwei Si, Peide D. D. Ye, Sumeet K. K. Gupta
Summary: Understanding the role of the dielectric layer in ferroelectric Hf0.5Zr0.5O2 based devices is crucial for application-driven optimizations. Experimental and simulation studies have shown that an increase in dielectric layer thickness results in changes in polarization switching mechanisms, leading to a decrease in remanent polarization and an increase in coercive voltage. Additionally, the effective polarization-voltage characteristics of the FE layer in the FE-DE stack exhibit a negative slope region, contributing to charge enhancement effects.
APPLIED PHYSICS LETTERS
(2021)
Review
Engineering, Electrical & Electronic
Sunil Jorwal, Ashish Dubey, Rajeev Gupta, Smriti Agarwal
Summary: Microwave absorbers are specially designed structures that convert electromagnetic waves into thermal energy to prevent reflection and transmission, reducing electromagnetic interference and enhancing electromagnetic shielding. They have various military applications in stealth technology for designing stealth aircraft, warships, and army clothing by reducing radar cross section. This review discusses metamaterial-based absorbers and their characteristics, such as left-handed material property, permittivity, and permeability, as well as the theoretical background and different applications. The review also covers frequency selective surfaces (FSS) and their categorization based on frequency, bandwidth, and material specifications.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Materials Science, Ceramics
Houlin Hu, Yao Wang, Chaoyang Cai, Pengcheng Zhang, Xiaoqing Chen, Rui Xiang, Hao Li
Summary: A novel low-temperature fired BaMnV2O7 ceramic with monoclinic structure was fabricated and found to exhibit good chemical stability and desirable microwave dielectric performance at 850 degrees C. The increasing content of V4+ was shown to affect the quality factor based on X-ray photoelectron spectroscopy analysis.
CERAMICS INTERNATIONAL
(2021)
Article
Geography, Physical
Wang Guangrui, Li Xiaofeng, Chen Xiuxue, Jiang Tao, Zheng Xingming, Wei Yanlin, Wan Xiangkun, Wang Jian
Summary: The study investigated the dependence of microwave radiation on frequency, polarization, and forest type through ground-based microwave radiometric observation experiment. New empirical transmissivity models for three forest types were developed based on experimental data, providing diverse asymptotic transmissivity saturation levels and the corresponding saturation point of woody stem volume. The root-mean-square error results between T-B simulations and AMSR-2 observations are approximately 3-6 K, offering an experimental and theoretical reference for further development of inversion models for snow parameters in forested areas.
INTERNATIONAL JOURNAL OF DIGITAL EARTH
(2021)
Article
Nanoscience & Nanotechnology
Wenjie Chen, Junjie Zhan, Yi Zhou, Rui Chen, Yubo Wang, Yungui Ma
Summary: The research proposes a comprehensive stealth technology that can simultaneously handle microwave absorption and adjustable visible and near-infrared spectra to adapt to different environments. The designed artificial coat can absorb over 80% energy in the X-band and its visible and near-infrared spectra can be electrically adjusted through an integrated emission system. This method could be extended to broader wave bands and has potential applications in multifunctional stealth technologies.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Alexander W. Powell, Rhiannon C. Mitchell-Thomas, Shiyu Zhang, Darren A. Cadman, Alastair P. Hibbins, J. Roy Sambles
Summary: Interlaced metallic meshes form a class of three-dimensional metamaterials that exhibit nondispersive, broadband modes at low frequencies. The experimental observation of these modes has been challenging, but the first experimental observation of the low frequency modes in a block of interlaced meshes fabricated through 3D printing has been reported. Antennas added to the meshes enable coupling of a plane wave to the low frequency dark mode, leading to the dispersion of the mode. Additionally, orthogonal antennas achieve polarization rotation and phase shifting of radiation passing through the structure. This work opens up possibilities for further experimental study into interlaced meshes and other complex 3D metamaterials.
Article
Engineering, Aerospace
Shishir Damani, Nathan Alexander, William J. Devenport, Benjamin P. Pearce, Samuel R. Shelley, Timothy A. Starkey, Alastair P. Hibbins, J. Roy Sambles
Summary: This experiment demonstrates the generation of trapped acoustic surface waves excited by a turbulent flow source through the coupling of pressure fluctuations at the interface between an acoustic metamaterial and a flow environment. The results show that the flow can be used to excite acoustic surface modes and their mode dispersion may be tailored toward realizing novel control of turbulent flow through acoustic-flow interactions. The study discusses the production, capture, and control process of acoustic surface modes through two different metasurface geometries.
Article
Physics, Applied
Alexander W. Powell, Alastair P. Hibbins, J. Roy Sambles
Summary: The superposition of resonances in a subwavelength particle can lead to powerful scattering beyond single channel limit and determine the directionality of scattered radiation. By overlapping modes with equivalent polarity in the far-field, a superbackscattering condition can be achieved, maximizing the total backscattered power. Additionally, overlapping multiple sets of modes can result in a multiband, superbackscattering effect.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
P. Petrov, A. P. Hibbins, J. R. Sambles
Summary: A fresh design approach for metamaterials formed by closely spaced helices has been developed based on retrieved values of electric and magnetic coupling coefficients between adjacent helices. Both numerical and experimental evaluations have been implemented to analyze coupling components between right- and left-handed helices in various arrangements, providing insights into the dependence of coupling strength on different factors. The study illustrates a geometry that allows for zero net-coupling between very close helices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
S. J. Berry, A. P. Hibbins, J. R. Sambles
Summary: The reflection coefficient of a microwave surface wave incident at the termination of a metasurface is explored in this study, focusing on two different surface types. The findings show that the reflection coefficient is dependent on both the momentum mismatch between the surface wave and the freely propagating modes as well as the different field distributions of the two modes, with the latter having a more confined surface wave field within the structure.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
Vladimir N. Semenenko, Vladimir A. Chistyaev, Alexey A. Politiko, Sergey G. Kibets, Vladimir N. Kisel, Cameron P. Gallagher, Conor McKeever, Alastair P. Hibbins, Feodor Y. Ogrin, J. Roy Sambles
Summary: The study measured the electrical permittivity and magnetic permeability of poly-mer binder filled with micron-scale carbonyl iron powder (CIP) composite materials. It was found that both properties increase logarithmically with increasing percentage of CIP volume loading. By using phosphated CIP R-100F-2, single-layer radar-absorbing materials with a thickness less than 1.5 mm can be produced.
PHYSICAL REVIEW APPLIED
(2021)
Article
Multidisciplinary Sciences
Lauren E. Barr, Gareth P. Ward, Alastair P. Hibbins, Euan Hendry, J. Roy Sambles
Summary: This paper presents a low-loss, broadband slow wave that can be controlled through geometrical design. The dispersion characteristics of the mode are analyzed, and a frequency-dependent mode index is found. By placing a straight wire along the axis of the helix, the frequency range of near-constant mode index can be broadened.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
S. R. Shelley, J. G. Beadle, A. P. Hibbins, J. R. Sambles
Summary: This study investigates the acoustic surface modes supported by a partly covered periodic meander groove structure formed in an assumed perfectly rigid plate. It is found that by changing the size and position of the uncovered section, the phase and group speeds of the acoustic surface wave can be tuned, affecting the dispersion relation.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
Gregory J. Chaplain, Richard Craster, Nick Cole, Alastair P. Hibbins, Timothy A. Starkey
Summary: Research has shown that Scholte modes localized between a submerged axisymmetric structured elastic plate and surrounding fluid can be converted into radiative modes via Umklapp diffraction, with experiments confirming the focusing of underwater sound across a wide range of frequencies. This focusing phenomenon is achieved through structured beams forming a cone at a desired spatial position associated with an abrupt change in the patterning of the plate.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Alexander W. Powell, Michal Mrnka, Alastair P. Hibbins, J. Roy Sambles
Summary: This study demonstrates the design and behavior of subwavelength structures with multiple degenerate resonances at the same frequency. By carefully structuring a high-permittivity spherical shell with metallic or air core, mode superposition can be achieved, resulting in enhanced interaction with electromagnetic radiation and defined directivity. Experimental results show the suppression of backscattering and unidirectional antenna emission in the metallic core structure, while bidirectional antenna emission is maximized in the air core structure through the superposition of different modes.
Article
Physics, Multidisciplinary
P. Petrov, A. P. Hibbins, J. R. Sambles, N. Aboulkhair, E. Saleh
Summary: This research presents a novel metasurface design comprised of capped helices arranged as a hexagonal array that supports a broadband near-isotropic negative-index microwave surface-wave. It demonstrates the ability to provide a structured surface that supports just a negative-index mode over a wide operational band with unprecedented bandwidth, without simultaneously exciting a forward wave. It is a significant advancement in the field of microwave technology.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
D. Osuna Ruiz, E. L. Martin, A. P. Hibbins, F. Y. Ogrin
Summary: A teardrop-shaped magnetic patch is proposed as a unidirectional magnetically driven spin wave emitter capable of operating in a wide range of frequencies. The system features reconfigurability and simplicity, allowing for control of wave emission through an external bias field.
Proceedings Paper
Engineering, Electrical & Electronic
Pavel Petrov, Alastair Hibbins, Roy Sambles
Summary: The Artificial Magnetic Conductor (AMC) is a type of metamaterial that enhances performance in various antenna and microwave design applications, and an analytical approach for size and bandwidth optimization of AMCs constructed of magnetically coupled elements is proposed in this work. Numerical results from COMSOL show that the optimized structure performs close to the theoretical limit.
2021 15TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2021)
Article
Materials Science, Multidisciplinary
T. J. Graham, J. D. Smith, A. P. Hibbins, J. R. Sambles, T. A. Starkey
Summary: Designer modes with negative or zero group velocities have applications in tailored wave propagation and energy redistribution. Experimental characterization of leaky Lamb modes in a thin flat aluminum-alloy plate submerged in water showed acoustic beaming from the plate caused by resonant transmission enhanced via intrinsic negative dispersion. Acoustic focusing properties depend on plate thickness and elastic material parameters and can be controlled for applications.
Article
Physics, Fluids & Plasmas
B. M. Staples, T. J. Graham, A. P. Hibbins, J. R. Sambles
Summary: Localized acoustic surface waves supported by a soft elastic plate in water were investigated. It was found that for soft interfaces, the energy of the Scholte wave is no longer mainly localized to the water, and the symmetric coupled Scholte mode exhibits dispersive behavior at low frequencies.
