Review
Chemistry, Multidisciplinary
Lin Xu, Huanyang Chen
Summary: This paper discusses the method of controlling electromagnetic waves and other wave dynamics through coordinate transformations, and explores the design and application of transformation media. Examples of achieving transformation media by artificially structured units from conventional materials are summarized. These concepts can be extended to control other types of waves, making them useful for multi-physics designs.
ADVANCED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Fan Yang, Kun Ding, John Brian Pendry
Summary: Surface plasmons at an interface between dielectric and metal regions can be made arbitrarily compact normal to the interface by introducing extreme anisotropy in the material parameters. By using a metamaterial structure comprising a square array of gold cylinders and tuning the filling factor, the desired material parameters can be achieved. However, the study shows that the unit cell dimensions of the metamaterial are the limiting factor in the degree of localisation achieved in simulations.
Article
Chemistry, Multidisciplinary
Lianchao Wang, Gwenn Ulliac, Bing Wang, Julio A. Iglesias Martinez, Krzysztof K. Dudek, Vincent Laude, Muamer Kadic
Summary: In this study, a novel 3D mechanical metamaterial is designed to address the limitation of phase transition on mechanical parameters. The material can undergo a phase transition from positive to negative Poisson's ratio under compression without significant degradation of Young's modulus.
Article
Optics
Francisco J. Diaz-Fernandez, Javier Marti, Carlos Garcia-Meca
Summary: Invisibility cloaks are a significant development in the field of metamaterials. While most efforts have been focused on improving the effectiveness of cloaks, little attention has been paid to the development of efficient techniques for detecting invisibility devices. This study proposes a different approach using diffraction tomography to enhance efficiency in detecting and obtaining images of invisibility cloaks, leading to improved sensitivity and potential application in sound cloaks.
LASER & PHOTONICS REVIEWS
(2023)
Article
Instruments & Instrumentation
A. Phanendra Kumar, Rajesh Nakka, Dineshkumar Harursampath, Sathiskumar Ponnusami
Summary: This research investigates the absorption capabilities of ceramic-based auxetic metamaterials in the X-band frequency range and their potential applications in stealth technology. The study found that star and missing-rib/cross-chiral geometries have similar absorption capabilities, which could have significant implications for EM absorption applications in the aerospace industry.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
Yuki Maegawa, Yosuke Nakata, Atsushi Sanada
Summary: In this article, all-dielectric carpet cloaks composed of jungle gym shaped dielectric unit cells are proposed. A design strategy for three-dimensional anisotropy control based on transformation optics is presented. The carpet cloaks are 3D printable and operate with polarization independent incident waves in arbitrary incident angles.
Review
Physics, Multidisciplinary
Yongju Zheng, Huajie Dai, Junyi Wu, Chuanping Zhou, Zhiwen Wang, Rougang Zhou, Wenxin Li
Summary: The development of smart metamaterials has brought about significant changes in various fields, such as communication systems, imaging, and camouflage. The combination of smart metamaterials and 3D printing technology has accelerated the advancement of metamaterials and has immense potential.
FRONTIERS IN PHYSICS
(2022)
Article
Engineering, Mechanical
M. Barillas Velasquez, L. Francesconi, M. Taylor
Summary: This work presents a novel rational process for designing auxetic tessellations with reduced stress concentration using Gielis' Superformula and Nelder-Mead optimization, resulting in a peak stress nearly 40% less than that of a comparable baseline circular stop-hole end-shape at the same porosity.
EXTREME MECHANICS LETTERS
(2021)
Article
Mechanics
Mengqi Wan, Keqin Yu, Huiyu Sun
Summary: The paper introduces three kinds of 4D printed programmable metamaterials, whose mechanical properties under different topological angles and radii are studied through experiments and finite element analysis. The results show that these metamaterials can achieve large deformation and auxetic behavior, and the Poisson's ratios and elastic moduli can be programmed by tuning parameters and temperature. Additionally, the proposed cylindrical shells with desired mechanical properties demonstrate potential applications in biomedical scaffolds.
COMPOSITE STRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Denis Sakhno, Eugene Koreshin, Pavel A. Belov
Summary: In this study, we investigated the dispersion properties of double interlaced wire metamaterials with geometry modified by affine transformation. We found that these metamaterials support eigenmodes with longitudinal polarization at low frequencies for all deformations. The isofrequency surfaces of the metamaterials, due to spatial dispersion, were shown to be ellipsoids centered at the Brillouin zone edges, and their corresponding refractive indices were analyzed both analytically and numerically.
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(2023)
Article
Mechanics
Jianfei Yao, Rujie Sun, Fabrizio Scarpa, Chrystel Remillat, Yu Gao, Yongfei Su
Summary: This study investigates the in-plane uniaxial tensile mechanical properties of two-dimensional graded rectangular perforations metamaterials using numerical homogenization finite element approaches benchmarked by experimental results. The metamaterial configuration is based on graded patterns of center-symmetric perforated cells that can exhibit an auxetic behavior. The overall stiffness behavior of the graded perforated metamaterial plates features a higher degree of compliance that depends on both the geometries of the cells of the graded areas and the graded pattern used.
COMPOSITE STRUCTURES
(2021)
Review
Crystallography
N. Suresh Kumar, K. Chandra Babu Naidu, Prasun Banerjee, T. Anil Babu, B. Venkata Shiva Reddy
Summary: Metamaterials are artificially engineered materials with unique properties, such as tunable and switchable features. Recent research has focused on developing tunable, switchable, nonlinear, and sensing functionalities in metamaterials.
Article
Nanoscience & Nanotechnology
J. Enrique Vazquez-Lozano, Inigo Liberal
Summary: This work investigates vacuum amplification effects in anisotropic temporal boundaries and shows that the anisotropy of the temporal boundary provides control over the angular distribution of the generated photons, leading to various vacuum amplification effects.
Article
Engineering, Mechanical
Xing Chi Teng, Wei Jiang, Xue Gang Zhang, Dong Han, Xi Hai Ni, Hang Hang Xu, Jian Hao, Tong Guo, Yu Fei Wu, Yi Min Xie, Xin Ren
Summary: A novel sandwich panel structure inspired by the synclastic curvature behavior of auxetic metamaterial was proposed to improve the controllability, auxeticity, flexibility, and synclastic curvature of traditional sandwich panels. Experimental and numerical methods were used to compare the similarities and differences between the novel and traditional sandwich panels under uniaxial compression. The study also explored the auxeticity, stretchability, synclastic curvature, and potential applications of the novel sandwich panel.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Physical
Gaole Dai, Jun Wang
Summary: In the past two decades, the control of physical fields, such as light or acoustics fields, has greatly advanced through the use of transformation media. However, the study of transformation media in thermal convection has been limited due to the complexity of the governing equations. This work demonstrates the validity of using transformation media in thermal convection and provides a foundation for the development of various metadevices in both thermal and flow fields.