A passively tunable non-resonant acoustic metamaterial lens for selective ultrasonic excitation

  title={A passively tunable non-resonant acoustic metamaterial lens for selective ultrasonic excitation},
  author={Hongfei Zhu and Fabio Semperlotti},
  journal={arXiv: Classical Physics},
In this paper, we present an approach to ultrasonic beam-forming and beam-steering in structures based on the concept of embedded non-resonant acoustic metamaterial lenses. The lens design exploits the principle of acoustic drop-channel which enables the dynamic coupling of multiple ultrasonic waveguides at selected frequencies. In contrast with currently available technology, the embedded lens allows generating directional excitation by means of a single ultrasonic transducer. The lens design… 

Figures from this paper

Adaptive GRIN lens based on piezoelectric metamaterial for acoustic beam focusing

Due to the attractive potential in elastic wave attenuation and wave guiding, acoustic metamaterials have received much attention. Different from the more conventional metamaterials that possess only

Manipulation of acoustic wavefront by gradient metasurface based on Helmholtz Resonators

A gradient acoustic metasurface to manipulate acoustic wavefront freely and some excellent wavefront manipulations are demonstrated by anomalous refraction, non-diffracting Bessel beam, sub-wavelength flat focusing, and effective tunable acoustic negative refraction.

Tunable prism based on piezoelectric metamaterial for acoustic beam steering

This letter reports a tunable acoustic prism featuring continuous beam steering for transverse waves at a single frequency. The proposed prism is comprised of arrayed piezoelectric unit-cells with

Design of embedded acoustic lenses in plate-like structures based on periodic acoustic black holes

We use a recently developed class of metamaterials based on geometric inhomogeneities to design acoustic lenses embedded in thin-walled structural element. The geometric inhomogeneity is based on the

Improving the performance of structure-embedded acoustic lenses via gradient-index local inhomogeneities

We investigate the use of graded inhomogeneities in order to enhance the focusing and collimation performance of structure-embedded acoustic metamaterial lenses. The type of inhomogeneity exploited

A Metasurface Radar for Steering Ultrasonic Guided Waves

All-angle negative refraction of flexural wave propagation on phononic thin plates with multilayer inclusions

This paper investigated all-angle negative refraction phenomenon of flexural wave propagating on phononic thin plates. The phononic thin plate consisted of a host plate and a periodic lattice of

Theoretical Modeling of Mechanical Waves in Periodic Phononic Structures

As an essential necessity for fundamental study and a broad variety of technological applications, it is important to control the propagation of mechanical waves and select particular vibration modes

Reduced order derivation of the two-dimensional band structure of a mixed-mode resonator array

In this paper, the 2D band structure of a mixed-mode metamaterial resonator array for in-plane waves is investigated. The band structure in the interior and on the boundary of the irreducible



Achieving selective interrogation and sub-wavelength resolution in thin plates with embedded metamaterial acoustic lenses

In this study, we present an approach to ultrasonic beam-forming and high resolution identification of acoustic sources having critical implications for applications such as structural health

Metamaterial based embedded acoustic filters for structural applications

We investigate the use of acoustic metamaterials to design structural materials with frequency selective characteristics. By exploiting the properties of acoustic metamaterials, we tailor the

Experimental demonstration of an acoustic magnifying hyperlens.

The experimental demonstration of an acoustic hyperlens that magnifies subwavelength objects by gradually converting evanescent components into propagating waves and achieves deep-subwavelength resolution with low loss over a broad frequency bandwidth is reported.

Implementing guided wave mode control by use of a phased transducer array

  • J. LiJ. Rose
  • Physics
    IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
  • 2001
The experimental results show that signal to noise ratio has been greatly improved by use of the time-delay system and some other benefits of the phased array, including unidirection generation and mode control flexibility, are discussed.

Locally resonant sonic materials

Detecting closing delaminations in laminated composite plates using nonlinear structural intensity and time reversal mirrors

Closing delaminations in composite laminated structures exhibit a nonlinear dynamic response when excited by high frequency elastic waves. The contact acoustic nonlinear effects taking place at the

Surface and bulk acoustic waves in two-dimensional phononic crystal consisting of materials with general anisotropy

Successful application of photonic crystals has led recently to a rapidly growing interest in the analogous acoustic effects in periodic elastic structures called phononic crystals. This study is

Acoustic channel drop tunneling in a phononic crystal

We study both theoretically and experimentally the possibility of resonant tunneling of acoustic waves between two parallel guides created in a phononic crystal composed of steel cylinders in water.

Theory for elastic wave scattering by a two-dimensional periodical array of cylinders: An ideal approach for band-structure calculations

We extend the multiple-scattering theory to elastic waves propagating in two-dimensional periodical composites. The formalism for the band-structure calculation is presented by taking into account