Angle-Dependent Ultrasonic Transmission through Plates with Subwavelength Hole Arrays

Estrada, Héctor; Abajo, F. Javier García de; Candelas, Pilar; Rubio, Constanza; Belmar, Francisco; Meseguer, F.

doi:10.1103/physrevlett.102.144301

Cited by 79 publications

(70 citation statements)

References 17 publications

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“…Recently, the ideas initially developed for electromagnetic waves have been extended to the field of acoustics, although some differences make the acoustical case unique, i.e. acoustic waves can be transmitted through a subwavelength aperture [11] and sound can penetrate into the solid [19]. Acoustic transmission through subwavelength apertures has been investigated both theoretically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

Sound transmission through plates perforated with two periodic subwavelength hole arrays

Estrada¹,

Gomez-Lozano²,

Rubio³

et al. 2011

J. Phys.: Condens. Matter

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Section: Introductionmentioning

confidence: 99%

Sound transmission through plates perforated with two periodic subwavelength hole arrays

Estrada¹,

Gomez-Lozano²,

Rubio³

et al. 2011

J. Phys.: Condens. Matter

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“…The artificial, second-order periodicity introduced in PnCs results in the modification of the phonon dispersion and, optionally, in complete frequency band gaps due to Bragg reflections and/or local resonances, which can be controlled by geometry and material properties [1,3,11,12]. The first experimental studies on PnCs, limited by fabrication capabilities (spacing of mm), were focused on sound (kHz) and ultrasound (MHz) waves propagation and intended for applications in acoustic filtering, sensing, and wave-guiding [13][14][15][16][17][18]. Recent advances in fabrication methods have allowed reduction of the characteristic sizes of PnCs to nm scale, enabling the control of hypersonic (GHz) phonons [2,4,6,19] and heat transport [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…Various one-, two-, three-dimensional PnCs designed to tune the propagation of bulk [2][3][4][13][14][15]24], surface (Rayleigh, Sezawa) [6,[25][26][27], and plate (Lamb) waves [5,16,18,28] have been investigated both theoretically and experimentally in a wide range of sizes and frequencies. However, the direct measurements of the hypersonic phonon dispersion were performed mostly for bulk [2][3][4]24,29,30] and surface PnCs [6,[31][32][33], while the influence of the phononic patterning in thin membranes was studied theoretically and experimentally by means of transmission measurements, where the acoustic waves are generated and detected electrically [5,18,34,35] or optically [28] in the kHz-MHz range.…”

Section: Introductionmentioning

confidence: 99%

Phonon dispersion in hypersonic two-dimensional phononic crystal membranes

et al. 2015

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We investigate experimentally and theoretically the acoustic phonon propagation in two-dimensional phononic crystal membranes. Solid-air and solid-solid phononic crystals were made of square lattices of holes and Au pillars in and on 250 nm thick single crystalline Si membrane, respectively. The hypersonic phonon dispersion was investigated using Brillouin light scattering. Volume reduction (holes) or mass loading (pillars) accompanied with second-order periodicity and local resonances are shown to significantly modify the propagation of thermally activated GHz phonons. We use numerical modeling based on the finite element method to analyze the experimental results and determine polarization, symmetry, or three-dimensional localization of observed modes.

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“…1(a), where all geometrical parameters are clearly defined. The elementary constituent is a 2D rigid hole array, the transmission properties of which have received considerable attention in connection to novel phenomena such as shielding of sound near the onset of diffraction [17], Fabry-Pérot resonances [18,19], and acoustoelastic resonances [20]. The pressure field c fully describes sound propagation in the fluid.…”

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confidence: 99%

Anisotropic Metamaterials for Full Control of Acoustic Waves

2012

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We study a class of acoustic metamaterials formed by layers of perforated plates and producing negative refraction and backward propagation of sound. A slab of such material is shown to act as a perfect acoustic lens, yielding images with subwavelength resolution over large distances. Our study constitutes a nontrivial extension of similar concepts from optics to acoustics, capable of sustaining negative refraction over extended angular ranges, with potential application to enhanced imaging for medical and detection purposes, acoustofluidics, and sonochemistry. DOI: 10.1103/PhysRevLett.108.124301 PACS numbers: 43.35.+d, 42.79.Dj, 81.05.Xj Optical negative refraction is a counterintuitive phenomenon that consists in bending light the wrong way at the interface between suitably engineered materials. Homogeneous substances with refraction indices of opposite signs provide an ideal combination on which this effect can take place. Over four decades ago, Veselago [1] realized that a material with simultaneous negative magnetic permeability and electric permittivity must have negative index and, therefore, can produce negative refraction. Subsequently, Pendry [2] showed that a slab of such material can amplify evanescent fields, from which a perfect lens can be constructed, capable of yielding images with deep subwavelength resolution. These concepts have been realized in artificial metamaterials, textured on a small scale compared to the wavelength and displaying homogeneous resonant electric and magnetic response [3,4].Inspired by these exotic optical phenomena, the quest for acoustic superlensing and negative refraction started with the prediction of negative index of refraction in materials exhibiting negative effective mass density and negative bulk modulus at the operating frequency [5]. In this context, several acoustic metamaterial designs have been proposed containing resonators in the form of coated metallic spheres [6], lumped elements [7], or perforations [8]. However, isotropic acoustic negative-index materials have not been experimentally realized to date, despite a long tradition of sound control using resonant linear devices [9,10], including applications to diffraction-limited imaging [11]. An alternative approach to acoustic negative refraction and lensing is suggested by electromagnetic metamaterials relying on anisotropy [12].In this Letter, we show that a holey anisotropic metamaterial can exert subwavelength control over sound waves beyond what is achieved with naturally occurring materials. We predict that, for appropriate choices of geometrical parameters, these metamaterials support negative refraction, backward-wave propagation along a direction opposite with respect to the acoustic energy flow, and subwavelength imaging with both the source and the image situated many wavelengths away from the material. Acoustic subwavelength control can be advantageous for (bio)medical ultrasonography and diagnostic imaging [13], acoustofluidic steering of microparticles and microorganisms [14], and sono...

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Angle-Dependent Ultrasonic Transmission through Plates with Subwavelength Hole Arrays

Cited by 79 publications

References 17 publications

Sound transmission through plates perforated with two periodic subwavelength hole arrays

Sound transmission through plates perforated with two periodic subwavelength hole arrays

Phonon dispersion in hypersonic two-dimensional phononic crystal membranes

Anisotropic Metamaterials for Full Control of Acoustic Waves

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