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Metamaterials - DOAJ

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Last Updated: 23 April 2022

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Expanding the design space and optimizing stop bands for mechanical metamaterials

A simplified order model based on a discrete spring-mass method is used to compare the mechanical characteristics of a unit cell to frequency response, which is intended for tuning for a unit cell's frequency response in the presence of the widest longitudinal stop band at a desired center frequency. To create a physically fit design space, the first, actual 3D printed size and material limitations are imposed on the design maps. Multi-material unit cells made with frames and resonators with different material properties are expected to have higher results than cells made of a single component.

Source link: https://doi.org/10.1016/j.matdes.2022.110510


Analogue Quantum Gravity in Hyperbolic Metamaterials

The sound waves in hyperbolic metamaterials seem to be similar to gravitational waves, in this approximation, and, therefore, the quantized sound waves appear to be similar to gravitational waves. Such an analogue model of quantum gravity in hyperbolic metamaterials where it is possible to change quantum gravity effects on and off as a function of metamaterial temperature.

Source link: https://doi.org/10.3390/universe8040242


Ultra-Narrowband Anisotropic Perfect Absorber Based on α-MoO 3 Metamaterials in the Visible Light Region

Optically anisotropic materials such as phthalium-coordinated optical fibers provide significant benefits in the manufacturing of polarization-dependent optical devices. In the visible light zone, the manufactured absorber will give polarization absorption in the visible light region along [100] and [001] directions. In addition, the effects of several geometric parameters on the optical absorption spectra are discussed. Interestingly, the single-band perfect absorption in our proposed metamaterials can be arbitrarily extended to multi-band perfect absorption by changing the thickness of the dielectric layer. In the visible light region, our research has shown some potential uses in anisotropic optical systems with tunable spectrum and selective polarization.

Source link: https://doi.org/10.3390/nano12081375


Coupling Schemes in Terahertz Planar Metamaterials

Dependent on the location of the split gap, the gap-to-gap near-field capacitive coupling of split-ring resonators in a unit cell leads to either blue shift or red shift of the fundamental inductive-capacitive resonance, depending on the direction of the split gap. The LC resonance tuning appears only when the split-ring resonators are in close proximity of each other; otherwise, they appear to be uncoupled. Conversely, the higher-order resonances are sensitive to the smallest change in the inter particle distance or split-ring resonator orientation and subsequent resonance line reshaping, resulting in a powerful subring resonance mode that can produce hot spots useful for sensing applications.

Source link: https://doi.org/10.1155/2012/148985


Non-Hermitian Complementary Acoustic Metamaterials for Imaging Through Skull With Imperfections

To evaluate NHCMMs' results under near-real imaging conditions, we apply NHCMMs to skull surfaces with irregular geometries and irregularities. We use a multi-step imaging procedure to gather the first visible pressure field caused by an irregular skull region and an initial metamaterial layer that is not perfectly matched, customize the metamaterial parameters to fit the skull region, and gather a second pressure field with the tumor location. Compared to the rest of the pressure field, the tumor location is confirmed by determining the contrast to noise ratio of the higher amplitude backscattered pressure field. Understanding its effectiveness in non-invasive neurological procedures and diagnostic imaging by NHCMMs with various defects is crucial to understanding the drug's efficacy; the achievement of tumor detection by the NHCMM/skull bilayer illustrated in this paper would possibly lead to the development of ultrasound diagnostics for neurological disorders.

Source link: https://doi.org/10.3389/fmech.2020.00055


Modified Luneburg Lens Based on Metamaterials

The gradient refractive index profile desired for the modified Luneburg lens can be obtained by varying the geometric dimensions of unit cells in each layer. When the source moves along the circumferential direction inside the lens, the new modified Luneburg lens will enable wide-angle beam scanning.

Source link: https://doi.org/10.1155/2015/902634

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions