With the capability of realizing asymmetric transmission and wavefront manipulation simultaneously with high efficiency, the proposed AOM offers a framework in integrating the unidirectional propagation with versatile wave manipulation, which may find applications in a great variety of scenarios such as ultrasound imaging or therapy where special control of acoustic transmission is always highly desired. The background medium is air, the mass density and sound speed of it is 1. Perfectly matched layers PMLs are utilized to eliminate the reflected waves by the outer boundaries.
How to cite this article : Jiang, X. Li, J. Double-negative acoustic metamaterial.
[PDF] Redirection of sound waves using acoustic metasurface - Semantic Scholar
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Table of contents
Liang, Z. Acoustic cloaking by extraordinary sound transmission. Yu, N. Science , — Parity-Time PT symmetric structures based on balanced distributions of gain and loss have attracted significant attention in acoustics metamaterials researches since they allow one to sculpture the flow of sound waves in complete new ways. We compute Bloch states in periodic fluidic stacks into which a spatially variation of gain and loss components are distributed. The complex acoustic band diagram exhibit modes coalescence, various exceptional points beyond which acoustic Bloch states are allowed to either amplify or attenuate sound within the PT broken phase.
Negative refraction and flat lens focusing of elastic waves has been recently demonstrated experimentally, though restricted to periodic structures where dispersion relations are readily available for prediction and design of superlenses. This is not possible anymore when considering quasiperiodic structures. Here we demonstrate quasicrystal platonic superlensing of elastic waves in perforated metallic thin plates, opening new possibilities for applications of quasiperiodic structures in elastic waves.
An infinite heterogeneous elastic triangular lattice connected to a non-uniform array of gyroscopic spinners is considered. An algorithm is described for generating interfacial waves that propagate along the boundaries of subdomains containing inhomogeneities in the spinner array. The interfacial waveforms have preferential directions that can be controlled through adjusting the frequency of excitation or the arrangement of the spinners.
Experimental and theoretical results show that layered bathymetries for water waves allow to obtain effective medium with significant anisotropy. The theory is based on the homogenization technique applied to the fully three-dimensional water wave problem. It agrees very well with experimental measurements.
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This paper investigates the sound transmission loss of locally resonant metamaterial and phononic crystal plates using unit cell and finite plate analysis. Plates with flexural wave stop bands can lead to enhanced vibro-acoustic performance. The acoustic insulation performance and frequency range depends, however, on the underlying stop band mechanism. While unit cell analysis suggests sound transmission loss improvements regardless of the mechanism, the vibro-acoustic performance of their finite plate counterparts can differ significantly.
We show in multimodal quasi-1D waveguides that constructive interference effects caused by the addition of two symmetrical disordered slabs provide a significant and broadband increase of transmission through opaque barriers.gohu-takarabune.com/policy/cmo/regi-aplicacion-para.php
Numerical simulations and a model are presented in order to tune and optimize this gain in transmission. These nanostructures merge the advantages of broadband optical absorption, ultrafast photocarrier transport, and carrier multiplication in graphene nano-stripes with the ultrafast transport of photocarriers to the gold patches before recombination. Through this approach, high-responsivity operation is achieved without the use of bandwidth- and speed-limiting quantum dots, defect states, or tunneling barriers.
We present graphene-gold metasurfaces to enhance light-graphene interaction in the MIR region and additionally, we demonstrate a new class of electrically controlled active metadevices working in microwave frequencies. The results show that electrical gating of graphene allows actively tuning the resonance wavelength. Graphene, a honeycomb lattice of carbon atoms ruled by tight-binding interactions, exhibits extraordinary electronic properties, due to Dirac cones within its band structure.
We present an experimental electromagnetic analog of graphene obtained with crystalline metamaterials made of simple copper wires and we demonstrate the presence of subwavelength Dirac cones. The dynamic tunability of graphene enables the engineering of metasurfaces such as conductivity gratings, which couple incident radiation to surface plasmons. Here we discuss singular graphene metagratings, whose conductivity is strongly suppressed.
These surfaces are found to exhibit remarkably broadband THz response, thus functioning as efficient broadband absorbers. By analytically characterising their response via transformation optics, we provide an intuitive understanding of the interaction of light with these surprisingly exotic metastructures. We place an unpatterned graphene sheet on a mushroom-type high impedance surface whose resonant frequency is stable for all incident angles. For TM-polarization, perfect absorption can be realized from normal to grazing incidence at the same frequency when modulating the Fermi level of graphene from 0.
In particular, we have recently shown that composite vortices, i. In this contribution, we further explore the generation and manipulation of composite vortices in order to design a single patch antenna that exhibits a sector radiation pattern and emulates the radiation properties of a dipole placed at a quarter of wavelength from a reflector.
The guiding structure commonly employed in leaky-wave antennas is dispersive, resulting in beam-steering with frequency. This behavior reduces operational bandwidth in point-to-point communication applications. In this work, we present an approach that aims at increasing the operational bandwidth of leaky-wave antennas by the employment of a metasurface lens.
Huygens dipole and multipole antennas are briefly reviewed. These electrically small systems provide enhanced directivity, a feature highly desired for current and future wireless platforms. The design, simulation, fabrication, and measurement results for the Huygens dipole antennas are discussed.
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- Manipulation of Sound Properties by Acoustic Metasurface and Metastructure.
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The Huygens multipole antenna concepts are described. These brief examinations will be greatly expanded upon during my presentation.