One path to acoustic cloaking
Steven A. Cummer,David Schurig +1 more
Reads0
Chats0
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
More filters
Book ChapterDOI
Chapter 3 Quasiconformal Transformation Media and Their Electrostatic AnalogyChapter 3 Quasiconformal Transformation Media and Their Electrostatic Analogy
Journal ArticleDOI
Acoustic topological one-way waveguides with tunable widths using spinning components
TL;DR: In this article , the authors proposed a topological one-way waveguide for acoustic waves whose width can be flexibly adjusted by adjusting the thickness of the ordinary phononic crystal, and the waveguide mode is robust against various types of local disorders and arbitrary bends.
Journal ArticleDOI
Achieving thermal magnification by using effective thermal conductivity
TL;DR: In this article, a thermal magnification device is proposed by using effective thermal conductivity, and the design is realized analytically by enforcing equality of effective thermalconductivity on the magnification device and the reference case in specified domains.
Journal ArticleDOI
Dynamic cloaking of a diamond-shaped hole in elastic plate
TL;DR: In this article , the authors proposed a unidirectional invisibility cloak for flexural waves based on an area-preserving coordinate transformation and time-resolved experiments reveal how the invisibility cloaking can deviate a pulsed plane wave from its initial trajectory and how the initial wavefront perfectly recombines behind the cloak, leaving the diamond-shaped hole invisible, notwithstanding the appearance of a forerunner.
Book ChapterDOI
Local Resonant Structures
TL;DR: The local resonance in the material was discovered in 2000 and it has been developed as an acoustical metamaterial as discussed by the authors, which enables negative mass density and negative bulk modulus.
References
More filters
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.