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Scattering Cancellation and Plasmonic Cloaking
Published in Filippo Capolino, Applications of Metamaterials, 2017
More recently, other interesting and exciting solutions in the field of metamaterial cloaking have been offered by several groups [17–43]. Of particular interest, some alternative cloaking techniques may be highlighted: the possibility of applying conformal transformations and space distortions for realizing a metamaterial cloak [17–26], the possibility of inducing anomalous localized resonances that may isolate and cloak a given object [27,28] and the use of transmission-line circuits to match a given network surrounding an object with the background material [37]. Some of these proposed solutions depend on resonant cloaks (or cloaks made of metamaterials with resonant inclusions), which makes their effects strongly dependent on frequency and on the geometrical and electromagnetic parameters of the cloak. An experimental verification of the main principles underlying the transformation-based cloaking has been recently presented at microwave frequencies for a 2D geometry [17].
A bio-inspired 3D metamaterials with chirality and anti-chirality topology fabricated by 4D printing
Published in International Journal of Smart and Nano Materials, 2023
Wei Zhao, Jie Zhu, Liwu Liu, Jinsong Leng, Yanju Liu
With the rational design of artificial architected metamaterials, unique mechanical and physical properties that are inaccessible in the natural world can be obtained. The main core in all metamaterials comprises fabricating a medium composed of repeating unit cells at a scale that is smaller than the wavelength of interest, giving rise to the smart properties of metamaterials. These inter-unit cells acting as artificial atoms interact with electromagnetic radiation, sound and optical waves, causing them to block, absorb, intensify, or bend. Potential applications of metamaterials are diverse, including metamaterial antennas [1–3], metamaterial absorbers [4–6], metamaterial cloaking devices [7–9], and metamaterial sound filtering [10–12], etc. Auxetic metamaterials, known as a special type of mechanical metamaterials, exhibit a negative Poisson’s ratio property, as they can expand (contract) in a transverse direction when uniaxially stretched (compressed) [13–16]. Besides, auxetic metamaterials also show some other unique characteristics, including higher shearing modulus, higher fracture toughness and excellent absorption properties [17–21].