High sound screening in low impedance slit arrays

Estrada, Héctor; Bravo, José María; Meseguer, F.

doi:10.1088/1367-2630/13/4/043009

Cited by 10 publications

(8 citation statements)

References 23 publications

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“…[4][5][6][7][8][9][10][11][12][13][14][15][16] The early studies focus mostly on the perforated hard plate with rigid approximation employed. [5][6][7][8][9][10][11] In these systems, the extraordinary acoustic transmission (EAT) arises from the resonant coupling of the apertures with external waves either collectively or individually, i.e., the coherent diffraction by the lattice structure or the local Fabry-Pérot (FP) resonance in each aperture.…”

Section: Broadband Transmission Enhancement Of Acoustic Waves Throughmentioning

confidence: 99%

“…Several recent studies take further the elasticity of the solid plates into account. [12][13][14][15][16] This additional consideration endows the acoustic systems with rich physics because of the existence of various surface modes and plate modes, which are created by the complex couplings between the longitudinal and transverse waves. With these intrinsic modes resonantly excited by the perforations, abundant transmission abnormalities have been observed.…”

Section: Broadband Transmission Enhancement Of Acoustic Waves Throughmentioning

confidence: 99%

“…[12][13][14][15] Besides the enhanced transmission 4-12 similar to the optical systems, the introduction of the elasticity can also produce an otherwise effect, i.e., enhanced reflection. [13][14][15][16] It is worth noting that the EATs mentioned above are directly associated with resonances and hence are inherently narrowband (i.e., working only in the vicinities of the resonances). In this work, we study a hybrid grating system and propose a non-resonant mechanism to realize the EAT effect.…”

Section: Broadband Transmission Enhancement Of Acoustic Waves Throughmentioning

confidence: 99%

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Broadband transmission enhancement of acoustic waves through a hybrid grating

Qiu

Hao

et al. 2012

Applied Physics Letters

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We report an anomalous transmission enhancement of acoustic waves through a hybrid grating. The fundamental physics behind this phenomenon can be captured well by the improved impedance matching between the hybrid grating and the background fluid. This type of acoustic transparency is broadband and can be robust against the incident angle, which is drastically different from the previously reported mechanisms that are closely related with resonances. Potential applications of this effect can be anticipated in ultrasonic devices.

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Section: Broadband Transmission Enhancement Of Acoustic Waves Throughmentioning

confidence: 99%

Section: Broadband Transmission Enhancement Of Acoustic Waves Throughmentioning

confidence: 99%

Section: Broadband Transmission Enhancement Of Acoustic Waves Throughmentioning

confidence: 99%

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Broadband transmission enhancement of acoustic waves through a hybrid grating

Qiu

Hao

et al. 2012

Applied Physics Letters

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“…This behavior differs from that of the Wood anomaly minimum at / 0 = 1 as previously thought in [1] and can be better explained by the so-called hydrodynamic short-circuit [11]. This results are robust when dissipative losses in the solid are considered and also when the angle of incidence is varied [12].…”

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confidence: 41%

High transmission loss of slit arrays for underwater sound

Estrada

Bravo

Meseguer

2011

OCEANS 2011 IEEE - Spain

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We report on the transmission loss of slit arrays under normal incidence. The role of the acoustical impedance ratio between the solid and the water in the transmission properties of slit arrays is studied numerically. Calculations predict large transmission loss up to 60 dB for low impedance ratio. Thus, the insertion loss of the slit-array is positive and could be useful in underwater sound applications. This counterintuitive result is discussed in terms of the hydrodynamic short-circuit, where the fluid and the solid interface vibrate out of phase resulting in sound transmission suppression.Recent results exploring the transmission properties of periodically perforated plates [1] reported on a quite counterintuitive result where, by means of the Wood anomaly, drilling holes in a homogeneous plate decreases the transmission of sound several decibels at certain frequencies, well below the prediction of the mass law. In addition, strong interaction between periodicity induced modes and leaky Lamb modes for finite impedance ratio between fluid and solid is demonstrated in [2], [3]. In this communication we will report on the transmission properties of slit arrays and how these properties vary with the influence of the impedance ratio between the solid and the water. Surprisingly, our results show that finite impedance ratios would produce larger transmission losses than an infinite impedance ratio.The transmission problem has been solved numerically by means of finite elements implemented in Comsol Multyphysics software for frequency domain. A unit cell of the slit array (see Fig. 1a)) having a period , a slab thickness = 0.6 , and an aperture of size = 0.28 constitutes the geometry of the problem. The slab is modeled as an elastic domain having zero out-of-plane components of the strain and displacement to keep the problem in two dimensions. A fluid domain is used to model the slit and the surrounding media. The pressure in the fluid is decomposed as the sum of incident (known) and scattered (unknown) pressures, the first being a plane wave at normal incidence. The fluid-structure interaction is ensured by imposing continuity of both, the normal displacement and the normal stress at the fluid-solid interfaces. The periodicity enters through the lateral limits of the unit-cell via periodic boundary conditions. Finally, to satisfy the Sommerfeld radiation condition at infinity, perfectly matched layers (PML) are used at top and the bottom of the unit-cell. Wavelengthdependent scaling is applied to the mesh, the thickness of the a) b) a d t Fig. 1. a) Diagram of the slit-array geometry having a periodicity , a slit size , and a slab thickness . The unit cell is delimited by vertical dashed lines. b) Transmission loss in dB as a function of the normalized frequency / 0 for slit arrays and homogeneous plates having different .PML, and the vertical size of the unit-cell. The transmitted and reflected sound power is calculated by integrating the vertical sound intensity along the unit-cell width right at the interface b...

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“…Sound transmission through arrays of subwavelength apertures has been investigated both theoretically and experimentally. First studies focused in the physics of resonant transmission [3]- [6], extraordinary sound screening [7], [8] and Lamb wave-hole resonance interaction [9], [10]. Besides the physical phenomena, the implications of these results could have an impact in the design and operation of phononic plate-based sensors [11].…”

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confidence: 99%

Ultrasonic transmission through plates perforated with compound hole arrays

Estrada

Puig

Gomez-Lozano

et al. 2011

2011 IEEE International Ultrasonics Symposium

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Numerical results obtained under the rigid-solid assumption are presented for compound arrays as a function of both parallel-to-plate wave-vector and frequency. Transmission minima arising from the interference between hole resonances interact with Wood anomalies. In addition, preliminary results on underwater ultrasound transmission measurements through a plate perforated with a rectangular hole array employing single point and synthetic aperture technique are presented.In the last years, extraordinary optical transmission through a metallic film perforated with subwavelength apertures [1] has received attention, not only due to the rich physics behind the phenomenon but also because of its potential application in optics [2]. Recently, due to the wave nature of sound, the ideas initially developed for electromagnetic waves have been extended to the field of acoustics and ultrasonics. Sound transmission through arrays of subwavelength apertures has been investigated both theoretically and experimentally. First studies focused in the physics of resonant transmission [3]-[6], extraordinary sound screening [7], [8] and Lamb wave-hole resonance interaction [9], [10]. Fig. 1. Diagram of the perforated plate unit-cell and the incident wave. The perforated plate is characterized by a period a, a hole diameter d, and a plate thickness h. The incident wave having a wave-vector k 0 has a parallel to the plate component given by k .Besides the physical phenomena, the implications of these results could have an impact in the design and operation of phononic plate-based sensors [11]. Thus, different arrangements of holes could provide alternative ways to influence the transmission spectra of perforated plates. Due to its simplicity, rigid-solid assumption [12], [13] is used to calculate the sound transmission through a compound hole array [14].The basic geometry of a simple hole array in a plate unitcell is depicted in Fig. 1 together with the orientation of the incident wave. The proportions of the basic hole array of Fig. 1 are d/a = 0.4 and h/a = 0.5. This primary array is combined with a secondary array having half of the period and hole size so that d /h = 0.4 while d/h = 0.8. This difference in the diameter to thickness ratio is clearly reflected in the individual hole transmission spectra at normal incidence as shown in Fig. 2(a). Not only the resonance frequencies are different, but also the maximum normalized sound transmitted power τ/πr 2 . When arranged periodically ( Fig. 2(b)), the differences in the transmitted sound power τ between both arrays are drastically accentuated. Only one full transmission peak can be observed for the primary array (dark blue curve) besides the one at λ → ∞ which always exists. However, two full transmission peaks are clearly distinguishable for the secondary array (light blue curve). The reason to explain this behavior can be found in the position of the minima, which corresponds to Wood anomalies given by(1) Thus, at normal incidence (k = 0) for the primary array (dark blue curve) w...

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High sound screening in low impedance slit arrays

Cited by 10 publications

References 23 publications

Broadband transmission enhancement of acoustic waves through a hybrid grating

Broadband transmission enhancement of acoustic waves through a hybrid grating

High transmission loss of slit arrays for underwater sound

Ultrasonic transmission through plates perforated with compound hole arrays

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