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Due to their unique capabilities in the field of wave propagation and control, Elastic metamaterials have developed transformative solutions to applications in structural mechanics. Band structures for locally resonant flexural beams with six inertant networks representative of the design spectrum are calculated by a free wave propagation scheme, i. e. waves that are not driven at a set frequency, are determined using the finite element method. Each configuration is shown to have its own dissipative characteristics, which are shown by a sequence of unusual wavenumber-free band structures directly relating Bloch damping ratios to oscillatory damped frequencies in infinite medium predictions.
Source link: https://doi.org/10.1007/s11012-022-01482-z
Recent advances in nanophotonics and material science have ignited a keen interest in optically-induced material dynamics, sparking new research directions in the key fields of Floquet matter and time metamaterials. Floquet phenomena are historically embedded in the condensed matter community, as they tap periodic temporal triggers to introduce new phases of matter, which are otherwise unobtainable in equilibrium systems. In parallel, the field of metamaterials has been delivering exotic wave phenomena based on tailored materials at the nanoscale, which have recently been extended by including time variations and switching as new degrees of freedom were introduced.
Source link: https://doi.org/10.1186/s43593-022-00015-1
This paper explores the use of space-time fractional-order operators in the simulation of linear elastic waves propagating in 1D periodic structures resting on a viscoelastic foundation. We first derive the dispersion relation for a 1D infinite periodic bar resting on a longitudinal viscoelastic foundation using integer order construction, which serves as a starting point in this study. We obtain the dispersion profiles associated with two different fractional formulations at Then. In order to result in a homogenized one-dimensional representation of the periodic bar, the second formulation depends on the usage of space-time fractional derivatives. A matching scheme is used in order to achieve real-valued fractional orders. Numerical experiments show that the space-time fractional wave equation provides an accurate homogenized model that accurately represents the wave propagation in a 1D periodic bar on a viscoelastic foundation.
Source link: https://doi.org/10.1007/s00419-022-02170-w
Here the authors introduce a system of neuro-metamaterials that enable the recognition and mirage of a dynamic entirely-optical object. Object recognition tools have made it into mainstream applications in the modern world, ranging from security and surveillance equipment to accessibility systems for the visually impaired. Moore's law makes it possible for photons to be accelerated by optical computation, which is practically new computing mode for photons; however, in situ application, it still necessitates digital processing for photons, which is inextricably tied to Moore's rule. In experiments where living rabbits play freely in front of the neuro-metamaterials, which enable us to detect the rabbits' representative postures at a fast pace. In addition, we show how this capability can be used to create innovative optical mirages, in which a sequence of rabbit movements is turned into a holographic video of a different species.
Source link: https://doi.org/10.1038/s41467-022-30377-6
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