scholarly journals Giant extraordinary transmission of acoustic waves through a nanowire

2020 ◽  
Vol 6 (10) ◽  
pp. eaay8507
Author(s):  
T. Devaux ◽  
H. Tozawa ◽  
P. H. Otsuka ◽  
S. Mezil ◽  
M. Tomoda ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Ultrasonic Attenuation ◽  
Transmission Efficiency ◽  
Subwavelength Structures ◽  
Solid Organ ◽  
Acoustic Beams ◽  
Input Side ◽  
Resolution Imaging ◽  
Organ Pipes ◽  
Meta Atom

Wave concentration beyond the diffraction limit by transmission through subwavelength structures has proved to be a milestone in high-resolution imaging. Here, we show that a sound wave incident inside a solid over a diameter of 110 nm can be squeezed through a resonant meta-atom consisting of a nanowire with a diameter of 5 nm equal to λ/23, where λ is the incident acoustic wavelength, corresponding to a transmission efficiency of 500 or an energy densification of ~14,000. This remarkable level of extraordinary acoustic transmission is achieved in the absence of ultrasonic attenuation by connecting a tungsten nanowire between two tungsten blocks, the block on the input side being furnished with concentric grooves. We also demonstrate that these “solid organ pipes” exhibit Rayleigh end corrections to their effective longitudinal resonant lengths notably larger than their in-air analogs. Grooves on the output side lead to in-solid directed acoustic beams, important for nanosensing.

Ultrasonic attenuation of 700-MHz surface acoustic waves in thin films of superconducting NbN

1983 ◽  
Vol 27 (5) ◽  
pp. 3065-3067 ◽  
Author(s):  
H. P. Fredricksen ◽  
M. Levy ◽  
J. R. Gavaler ◽  
M. Ashkin
Keyword(s):  
Thin Films ◽  
Acoustic Waves ◽  
Ultrasonic Attenuation ◽  
Surface Acoustic Waves

Ultrasonic attenuation of surface acoustic waves in a thin film of superconducting Nb3Sn

1980 ◽  
Vol 75 (5) ◽  
pp. 389-391 ◽  
Author(s):  
H.P. Fredricksen ◽  
H.L. Salvo ◽  
M. Levy ◽  
R.H. Hammond ◽  
T.H. Geballe
Keyword(s):  
Thin Film ◽  
Acoustic Waves ◽  
Ultrasonic Attenuation ◽  
Surface Acoustic Waves

scholarly journals The Peculiarities of the Acoustic Waves of Zero-Order Focusing in Lithium Niobate Plate

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4000
Author(s):  
Iren Kuznetsova ◽  
Ilya Nedospasov ◽  
Andrey Smirnov ◽  
Vladimir Anisimkin ◽  
Dmitry Roshchupkin ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Electric Fields ◽  
Acoustic Waves ◽  
Transfer Functions ◽  
Lamb Waves ◽  
Zero Order ◽  
Beam Focusing ◽  
Acoustic Beams ◽  
Hybrid Devices ◽  
Shear Horizontal

In this research, beam focusing in lithium niobate plate was studied for fundamental anti-symmetric (A0) and symmetric (S0) Lamb waves, and the shear-horizontal (SH0) wave of zero-order. Using the finite element method, appropriate configuration of the interdigital transducer with arc-like electrodes was modeled accounting for the anisotropy of the slowness curves and dispersion of the modes in the plate. Profiles of the focalized acoustic beams generated by the proposed transducer were theoretically analyzed. Based on the result of the analysis, relevant delay lines were fabricated and transfer functions (insertion loss) of the line were measured for SH0 wave in YX-lithium niobate plate. Using an electron scanning microscope, distribution of the electric fields of the same wave were visualized. The results of this study may be useful for hybrid devices and sensors combining nano and acoustoelectronic principles.

‘Acoustic Fiber’ Aluminum-Clad Steel Cable for Communication and Power Transmission

2013 ◽  
Author(s):  
James A. LaDouce ◽  
Henry A. Scarton ◽  
Kyle R. Wilt ◽  
Pankaj K. Das ◽  
Gary J. Saulnier
Keyword(s):  
Acoustic Waves ◽  
Power Transmission ◽  
Steel Wire ◽  
Transmission Efficiency ◽  
Steel Cable ◽  
Steel Core ◽  
Longitudinal Acoustic Wave ◽  
Optical Fiber Cable ◽  
The Difference ◽  
Clad Steel

An aluminum-clad steel wire is used to transmit power acoustically. Analogous to optical fiber cable consisting of a core and a cladding layer selected for total internal reflection due to the difference in refractive index between the two, an acoustic fiber cable is constructed by using aluminum-clad steel wire having the property that the bulk longitudinal acoustic wave speed within aluminum is higher than within the steel core by about 8% such that ultrasonic longitudinal waves are trapped in the steel core and the acoustic waves propagate to great range. Results using a 5.9 mm aluminum-clad steel wire 28.7 m long with 0.45 mm wall thickness show successful acoustic transmission in air in the frequency range 20 Hz to 1.5 MHz, with maximum power transmission efficiency 26% for frequencies near 75 kHz and 12% for frequencies near 215 kHz.

INTERACTION OF ACOUSTIC WAVES WITH POLARIZATION WAVES IN FERROELECTRICS

1967 ◽  
Vol 45 (12) ◽  
pp. 3903-3913 ◽  
Author(s):  
V. Dvořák
Keyword(s):  
Elastic Constants ◽  
Acoustic Waves ◽  
Linear Response ◽  
Piezoelectric Effect ◽  
Ultrasonic Attenuation ◽  
Linear Response Theory ◽  
Dielectric Susceptibility ◽  
Direct Relation ◽  
Effective Elastic Constants ◽  
Space Dispersion

An expression for effective elastic constants which control the behavior of acoustic waves interacting with polarization waves in ferroelectrics is derived using the linear response theory. If interactions due to the piezoelectric effect only are taken into account, then the frequency and space dispersion of effective elastic constants are essentially determined by those of the linear dielectric susceptibility. Some consequences of this direct relation between the elastic and dielectric properties of ferroelectrics are discussed for the ultrasonic attenuation and the Brillouin or neutron scattering by acoustic waves.

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