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Metamaterial - Astrophysics Data System

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Last Updated: 15 May 2022

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Tunable plasmon-induced transparency with coupled L-shape graphene metamaterial

To achieve the plasmon-induced transparency effect, a graphene strip and a L-shaped graphene rectangular block are combined. Using the coupled mode method, the PIT effect's physical characteristics are investigated. The optical switch's performance is measured by various parameters, including the geometric dimension, Fermi level, and polarization angle. With a specific Fermi rate, the modulation amplitude can reach 74. 9%, while maximum polarization extinction ratios can reach 11. 34 dB.

Source link: https://ui.adsabs.harvard.edu/abs/2022ResPh..3805537C/abstract


Design and Simulation of Photo-excited Tunable Perfect Absorber Based on Semiconductor-incorporated Metamaterial Structure

The unique metamaterial absorber with sandwich construction is able to achieve nearly 100% microwave absorption. Ge on the metamaterial conductivity varies under different pump power of the incident laser light. In both cases, simulation results showed that the absorber has maximum absorbances of over 97% under two pump light conditions.

Source link: https://ui.adsabs.harvard.edu/abs/2022JPhCS2219a2030G/abstract


A metamaterial sensor for detecting the location of a sub-wavelength object

The sensor consists of a transmission line, which allows the propagation of spoof surface plasmon polaritons with localized electromagnetic field, and a spin-resonator that resonates at designed frequencies between 0. 9 and 2. 7 GHz. The CSR is ignited by the EM coupling of the SSPP TL, in practice, and the precise location of the metallic object is determined by the transmission coefficient. With a low error of 2, it has been demonstrated that the random location of the sub-wavelength object can be precisely identified within a range of 9' mm 2 with a low error of 2.

Source link: https://ui.adsabs.harvard.edu/abs/2022ApPhL.120r1703H/abstract


Mechanical cloak via data-driven aperiodic metamaterial design

An invisibility cloak to conceal objects from an outside observer has long been a point of concern in metamaterial design. Although cloaks have been developed for optical, thermal, and electric fields, limited progress has been made for mechanical cloaks. Through simulations and experimental validations, we show that excellent cloaking results can be achieved for many boundary conditions, shapes of voids, base cells, and even multiple voids.

Source link: https://ui.adsabs.harvard.edu/abs/2022PNAS..11922185W/abstract


Metamaterial-enhanced coda wave interferometry with customized artificial frequency-space boundaries for the detection of weak structural damage

The accumulated scattered and reflect waves from scatterers and building boundaries have been shown to deliver exceptional sensitivity to little structural damage. However, coda waves heavily depend on wave reflections from geographical boundaries, which compromises the CWI's effectiveness for the monitoring of large structures. In addition, coda waves typically have global damage information, effectively prohibiting their use for damage localization. Coda wave energy, as a result of structural damage, is increased, contributing to the detection of low structural damage. The proposed meta-devices have significantly increased the CWI's sensitivity to minor injury and their potential for damage localization, according to results. The concept of metamaterial-based CWI holds a lot of promise for future structural health monitoring applications.

Source link: https://ui.adsabs.harvard.edu/abs/2022MSSP..17409131S/abstract


Investigation of a novel MRE metamaterial sandwich beam with real-time tunable band gap characteristics

In this research, a novel tunable local resonance band gap for vibration isolation was shown as the transition of the metamaterial structure into sandwich beam could potentially raise the vibration attenuation results. The compact MMRESB's compact MMRESB with local coil resonators can incrementally tune its band gap from 52. 3-92. 8 Hz to 56. 5. 9 Hz, indicating that as the applied current rises from 0. 0 A to 1. 0 A, the robust MMRESB can effectively reduce vibration wave propagation along the beam.

Source link: https://ui.adsabs.harvard.edu/abs/2022JSV...52716870W/abstract


Flexural wave attenuation by metamaterial beam with compliant quasi-zero-stiffness resonators

Wave attenuation in very low-frequency band gaps is predicted by a new metamaterial beam with embedded quasi-zero-stiffness resonator. Then, the dispersion coefficients of the metamaterial beam's dispersion relationship are calculated by the transfer matrix method to predicate the band gap theoretically. In addition, the spectral element method is used to determine the transmittance of the flexural wave's transmistance. According to this, the QZS metamaterial beam would be promising in application for very low-frequency wave attenuation.

Source link: https://ui.adsabs.harvard.edu/abs/2022MSSP..17409119C/abstract


Active modulation of metamaterial transport properties in the terahertz range

In particular, the active control of EIT in metamaterials provides interesting opportunities for improving optical networks, 6G/terahertz communications, and active sensor. Via an active modulation device, the transmission window's amplitude and resonant frequency can be adjusted controllably. The group delay of this metamaterial sample is also changeable at the same time. You can also change the diameter of the silicon array to achieve this frequency selectivity of this metamaterial sample. As the refractive index of oil increases, the resonant frequency of the transmission window has been reduced to low frequency.

Source link: https://ui.adsabs.harvard.edu/abs/2022OptMa.12712283J/abstract


A robust optimised shunted electrodynamic metamaterial for multi-mode vibration control

The resistive and inductive shunt values of an EDMM attached to a parametrically chaotic system are to be discovered, and a Particle Swarm Optimisation is used to find a solution using an analytical model of the system. However, it has also been shown that the EDMM motion is then highly advanced and hence, inherently robust to structural uncertainties, so it is also necessary to ignore the uncertainty in the structure and optimize the EDMM considering actuator uncertainty alone.

Source link: https://ui.adsabs.harvard.edu/abs/2022JSV...52716861S/abstract

* 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