Wave propagation control at the deep subwavelength scale in metamaterials

Lemoult, Fabrice; Kaïna, Nadège; Fink, Mathias; Lerosey, Geoffroy

doi:10.1038/nphys2480

Cited by 300 publications

(233 citation statements)

References 31 publications

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“…Recent advancements in man-made materials ("metamaterials") have resulted in intriguing achievements in acoustic and phononic transport manipulation [1]. These discoveries include dynamic negative density and a bulk modulus [2][3][4][5][6][7][8], subwavelength imaging [9][10][11], acoustic and surface wave cloaking [12][13][14][15], a phononic band gap [16,17], extraordinary acoustic transmission [18,19], Anderson localization [20], and asymmetric transmission [21][22][23][24][25]. These works, so far, are based on the modulation of the real part of the acoustic parameters.…”

Section: Introductionmentioning

confidence: 99%

PT-Symmetric Acoustics

et al. 2014

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We introduce here the concept of acoustic parity-time (PT ) symmetry and demonstrate the extraordinary scattering characteristics of the acoustic PT medium. On the basis of exact calculations, we show how an acoustic PT -symmetric medium can become unidirectionally transparent at given frequencies. Combining such a PT -symmetric medium with transformation acoustics, we design two-dimensional symmetric acoustic cloaks that are unidirectionally invisible in a prescribed direction. Our results open new possibilities for designing functional acoustic devices with directional responses.

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Section: Introductionmentioning

confidence: 99%

PT-Symmetric Acoustics

et al. 2014

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“…In acoustics, this phenomenon has attracted renewed attention more recently [2][3][4][5][6] in the context of sound propagation in artificial media referred to as locally resonant metamaterials [2]. It is well known that in a medium containing resonant inclusions [2,[7][8][9][10][11][12], propagating waves hybridize with the local resonance resulting in an avoided crossing bandgap, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Waveguiding by a locally resonant metasurface

Maznev

Gusev

2015

Phys. Rev. B

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Dispersion relations for acoustic and electromagnetic waves guided by resonant inclusions located at the surface of an elastic solid or an interface between two media are analyzed theoretically within the effective medium approximation. Oscillators on the surface of an elastic half-space are shown to give rise to a Love-type surface acoustic wave only existing below the oscillator frequency. A simple dispersion relation governing this system is shown to also hold for electromagnetic waves guided by Lorentz oscillators at an interface between two media with equal dielectric constants. Different kinds of behavior of the dispersion of the resonantly guided mode depending on whether the bulk wave in the absence of oscillators can propagate along the surface or interface are identified.

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“…Our metasurface is essentially a metamaterial/ phononic crystal hybrid structure 10 and both the local and non-local responses can be leveraged for the purpose of shaping the wavefront with a much larger degree of control than traditional acoustic wave manipulation methods. Such thin planar acoustic metasurfaces, along with existing bulk metamaterials [11][12][13][14][15][16][17][18][19][20] , provide a new design methodology for acoustic wave modulation, sensing and imaging applications.…”

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confidence: 99%

Wavefront modulation and subwavelength diffractive acoustics with an acoustic metasurface

et al. 2014

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Metasurfaces are a family of novel wavefront-shaping devices with planar profile and subwavelength thickness. Acoustic metasurfaces with ultralow profile yet extraordinary wave manipulating properties would be highly desirable for improving the performance of many acoustic wave-based applications. However, designing acoustic metasurfaces with similar functionality to their electromagnetic counterparts remains challenging with traditional metamaterial design approaches. Here we present a design and realization of an acoustic metasurface based on tapered labyrinthine metamaterials. The demonstrated metasurface can not only steer an acoustic beam as expected from the generalized Snell's law, but also exhibits various unique properties such as conversion from propagating wave to surface mode, extraordinary beam-steering and apparent negative refraction through higher-order diffraction. Such designer acoustic metasurfaces provide a new design methodology for acoustic signal modulation devices and may be useful for applications such as acoustic imaging, beam steering, ultrasound lens design and acoustic surface wave-based applications.

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Wave propagation control at the deep subwavelength scale in metamaterials

Cited by 300 publications

References 31 publications

PT-Symmetric Acoustics

PT-Symmetric Acoustics

Waveguiding by a locally resonant metasurface

Wavefront modulation and subwavelength diffractive acoustics with an acoustic metasurface

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