One path to acoustic cloaking
Steven A. Cummer,David Schurig +1 more
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TLDR
In this paper, it was shown that the acoustic equations in a fluid are identical in form to the single polarization Maxwell equations via a variable exchange that also preserves boundary conditions, and the existence of transformation-type solutions for the 2D acoustic equations with anisotropic mass via time harmonic simulations of acoustic cloaking.Abstract:
A complete analysis of coordinate transformations in elastic media by Milton et al has shown that, in general, the equations of motion are not form invariant and thus do not admit transformation-type solutions of the type discovered by Pendry et al for electromagnetics. However, in a two-dimensional (2D) geometry, the acoustic equations in a fluid are identical in form to the single polarization Maxwell equations via a variable exchange that also preserves boundary conditions. We confirm the existence of transformation-type solutions for the 2D acoustic equations with anisotropic mass via time harmonic simulations of acoustic cloaking. We discuss the possibilities of experimentally demonstrating acoustic cloaking and analyse why this special equivalence of acoustics and electromagnetics occurs only in 2D.read more
Citations
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Journal ArticleDOI
Theoretical model of lossy acoustic bipolar cylindrical cloak with negative index metamaterial
Proceedings ArticleDOI
A New Model for the Two-Dimensional Acoustic Cloak
Wei Li,Mignsheng Wang +1 more
TL;DR: In this article, a new formula is proposed for a two-dimensional anisotropic acoustic cloak based on the sound speed matching and sound boundary impendence matching, where a crucial parameter is involved in the expression for the acoustic cloak material.
Proceedings ArticleDOI
Optimization Method in 2D DC Cloaking Problems
TL;DR: In this paper, a numerical algorithm based on particle swarm optimization is proposed and the results of numerical experiments are discussed, which shows that high cloaking efficiency of the shell can be achieved either using a highly anisotropic single-layer shell or using a multilayer shell with isotropic layers.
DissertationDOI
High frequency homogenisation for structured interfaces
TL;DR: In this paper, high frequency homogenization is applied to develop asymptotics for waves propagating along interfaces or structured surfaces, which are valid even at high frequencies. But they are not applicable to the case of Rayleigh-bloch waves.
Journal ArticleDOI
Engineered diffraction gratings for acoustic cloaking.
TL;DR: In this paper, the authors show that engineered diffraction gratings can considerably simplify the design and performance of acoustic devices, and they use them to cloak an object placed over a rigid surface.
References
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Journal ArticleDOI
Magnetism from conductors and enhanced nonlinear phenomena
TL;DR: In this paper, it was shown that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu/sub eff/, which can be tuned to values not accessible in naturally occurring materials.
Journal ArticleDOI
Controlling Electromagnetic Fields
TL;DR: This work shows how electromagnetic fields can be redirected at will and proposes a design strategy that has relevance to exotic lens design and to the cloaking of objects from electromagnetic fields.
Journal ArticleDOI
Metamaterial Electromagnetic Cloak at Microwave Frequencies
David Schurig,Jack J. Mock,B.J. Justice,Steven A. Cummer,John B. Pendry,Anthony F. Starr,David R. Smith +6 more
TL;DR: This work describes here the first practical realization of a cloak of invisibility, constructed with the use of artificially structured metamaterials, designed for operation over a band of microwave frequencies.
Journal ArticleDOI
Optical Conformal Mapping
TL;DR: A general recipe for the design of media that create perfect invisibility within the accuracy of geometrical optics is developed, which can be applied to escape detection by other electromagnetic waves or sound.
Journal ArticleDOI
Ultrasonic metamaterials with negative modulus
Nicholas X. Fang,Dongjuan Xi,Jianyi Xu,Muralidhar Ambati,Werayut Srituravanich,Cheng Sun,Xiang Zhang +6 more
TL;DR: A new class of ultrasonic metamaterials consisting of an array of subwavelength Helmholtz resonators with designed acoustic inductance and capacitance with an effective dynamic modulus with negative values near the resonance frequency is reported.