Resonant coupling of Rayleigh waves through a narrow fluid channel causing extraordinary low acoustic transmission

García-Chocano, Victor M.; Nagaraj,; López-Rı́os, T.; Gumen, L.; Sánchez‐Dehesa, José; Krokhin, Arkadii

doi:10.1121/1.4744939

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…Several types of transmission mechanism were proposed for acoustic extraordinary transmission, in particular periodic-lattice resonances, Fabry-Perot-type resonances, elastic Lamb-mode-resonances, Helmholtz resonators, membrane resonances and space coiling. Experiments on the passage of Rayleigh waves through a fluid channel have demonstrated anomalously low acoustic transmission at certain frequencies 20 . However, in spite of the interesting possibilities in the fields of metamaterials and subwavelength imaging, the extraordinary transmission of surface waves, and in particular surface acoustic waves, has never been investigated.…”

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confidence: 99%

Extraordinary transmission of gigahertz surface acoustic waves

Mézil

Chonan

Otsuka

et al. 2016

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Extraordinary transmission of waves, i.e. a transmission superior to the amount predicted by geometrical considerations of the aperture alone, has to date only been studied in the bulk. Here we present a new class of extraordinary transmission for waves confined in two dimensions to a flat surface. By means of acoustic numerical simulations in the gigahertz range, corresponding to acoustic wavelengths λ ~ 3–50 μm, we track the transmission of plane surface acoustic wave fronts between two silicon blocks joined by a deeply subwavelength bridge of variable length with or without an attached cavity. Several resonant modes of the structure, both one- and two-dimensional in nature, lead to extraordinary acoustic transmission, in this case with transmission efficiencies, i.e. intensity enhancements, up to ~23 and ~8 in the two respective cases. We show how the cavity shape and bridge size influence the extraordinary transmission efficiency. Applications include new metamaterials and subwavelength imaging.

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confidence: 99%

Extraordinary transmission of gigahertz surface acoustic waves

Mézil

Chonan

Otsuka

et al. 2016

Sci Rep

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“…Since the system is symmetric with respect to the plane z = 0 the eigenmodes are either even or odd functions of z. Odd modes are excited at oblique incidence or if the plates are made of different metals [26]. In our case only even modes can be excited.…”

Section: Dispersion Of Eigenmodes In Infinite Channelmentioning

confidence: 86%

Redirection of sound in straight fluid channel with elastic boundaries

et al. 2015

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A fluid channel clad between two solid plates is an acoustic waveguide where excitation of elastic waves at the channel boundaries has been usually neglected. This work develops a rigorous theory of scattering of sound by a finite-length fluid channel which takes into account excitation of elastic eigenmodes of two plates acoustically coupled through a fluid channel. The theory predicts an evidently contradictory result that the transmission and reflection coefficients of a non-dissipative channel do not sum up to one. Moreover, they both exhibit deep minima at the same series of frequencies. It is shown that conservation of acoustic energy occurs due to redirection of sound, since part of the acoustic flux escapes into the solid plates. This scattering becomes possible because the bf uniform flatness of the boundaries of a straight channel is broken by vibrations. Theoretical predictions are supported by the experiments with ultrasound transmission through a narrow slit obtained between two brass or aluminum plates submerged in water. Measured transmission spectra exhibit deep minima exactly at the frequencies where the theory predicts strong redirection of sound.

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“…the initial flux of energy is partially redirected by 90 • . The effect of redirection of acoustic energy was recently predicted not only for periodic systems of scatterers [16,19,22] but also for a narrow fluid channel in a solid elastic plate [23,24].…”

Section: Introductionmentioning

confidence: 99%

Redirection and Splitting of Sound Waves by a Periodic Chain of Thin Perforated Cylindrical Shells

et al. 2017

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Scattering of sound by finite and infinite chains of equally spaced perforated metallic cylindrical shells in an ideal (inviscid) and viscous fluid is theoretically studied using rigorous analytical and numerical approaches. Due to perforations, a chain of thin shells is practically transparent for sound within a wide range of frequencies. It is shown that strong scattering and redirection of sound by 90 • may occur only for a discrete set of frequencies (Wood's anomalies) where the leaky eigenmodes are excited. The spectrum of eigenmodes consists of antisymmetric and symmetric branches with normal and anomalous dispersion, respectively. The antisymmetric eigenmode turns out to be a deaf mode since it cannot be excited at normal incidence. However, at slightly oblique incidence both modes can be excited at different but close frequencies. The symmetric mode, due to its anomalous dispersion, scatters sound in the "wrong" direction, thus allowing splitting of the incoming signal containing two harmonics into two beams propagating along the chain in the opposite directions. Calculations are presented for aluminum shells in viscous air where the effects of anomalous scattering, redirection, and signal splitting are well manifested.

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Resonant coupling of Rayleigh waves through a narrow fluid channel causing extraordinary low acoustic transmission

Cited by 4 publications

References 30 publications

Extraordinary transmission of gigahertz surface acoustic waves

Extraordinary transmission of gigahertz surface acoustic waves

Redirection of sound in straight fluid channel with elastic boundaries

Redirection and Splitting of Sound Waves by a Periodic Chain of Thin Perforated Cylindrical Shells

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