Super-resolution ultrasonic imaging of stiffness variations on a microscale active metasurface

Lani, Shane W.; Sabra, Karim G.; Degertekin, F. Levent

doi:10.1063/1.4942752

Cited by 7 publications

(6 citation statements)

References 29 publications

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“…Finally, as we initially proved [25], it also enhances the intensity deposited onto one location, because of the subwavelength dimensions of the focal spots. This entails that our approach can be utilized for subwavelength-sized actuators and micro-electromechanical systems as proved recently by Lani et al [57].…”

Section: Subwavelength Focusing From the Far Fieldmentioning

confidence: 99%

Soda Cans Metamaterial: A Subwavelength-Scaled Phononic Crystal

et al. 2016

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Photonic or phononic crystals and metamaterials, due to their very different typical spatial scales-wavelength and deep subwavelength-and underlying physical mechanisms-Bragg interferences or local resonances-, are often considered to be very different composite media. As such, while the former are commonly used to manipulate and control waves at the scale of the unit cell, i.e., wavelength, the latter are usually considered for their effective properties. Yet we have shown in the last few years that under some approximations, metamaterials can be used as photonic or phononic crystals, with the great advantage that they are much more compact. In this review, we will concentrate on metamaterials made out of soda cans, that is, Helmholtz resonators of deep subwavelength dimensions. We will first show that their properties can be understood, likewise phononic crystals, as resulting from interferences only, through multiple scattering effects and Fano interferences. Then, we will demonstrate that below the resonance frequency of its unit cell, a soda can metamaterial supports a band of subwavelength varying modes, which can be excited coherently using time reversal, in order to beat the diffraction limit from the far field. Above this frequency, the metamaterial supports a band gap, which we will use to demonstrate cavities and waveguides, very similar to those obtained in phononic crystals, albeit of deep subwavelength dimensions. We will finally show that multiple scattering can be taken advantage of in these metamaterials, by correctly structuring them. This allows to turn a metamaterial with a single negative effective property into a negative index metamaterial, which refracts waves negatively, hence acting as a superlens.

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Section: Subwavelength Focusing From the Far Fieldmentioning

confidence: 99%

Soda Cans Metamaterial: A Subwavelength-Scaled Phononic Crystal

et al. 2016

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“…An and Sohn 42 demonstrated experimentally that surface cracks can be detected by measuring displacement enhancement near cracks due to the generation of evanescent waves. Recently, in electromagnetic and ultrasonic studies, the characteristics of evanescent waves have been applied to superresolution imaging 43,44 in which the resolution of an image exceeds the limitation of the wavelength.…”

Section: 31mentioning

confidence: 99%

“…Elastic waves are generated in a solid medium by a laser through one of two mechanisms: ablation or the thermoelastic effect. [42][43][44][45][46][47][48][49][50][51][52][53] For large pulse energy, a sudden laser energy input induces plasma emission from the surface of a material, and a normal force is instantaneously loaded as a reaction force of the plasma emission. 45,50 For small laser pulse energy, below the ablation regime, sudden thermal expansion of the surface of a material generates elastic waves.…”

Section: Relationship Between Source Position and Energy Generatedmentioning

confidence: 99%

Vibration energy analysis of a plate for defect imaging with a scanning laser source technique

Hayashi

Fukuyama

2016

The Journal of the Acoustical Society of America

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Vibration energies generated by laser irradiation to a plate with a crack were calculated by the semi-analytical finite element method to elucidate the principle of defect imaging using a scanning laser source. For normal incidence in the ablation regime, the incident energy increases when the incident source is located in the vicinity of the crack, owing to the effect of the non-propagating A1 modes. For dipole loading in the thermoelastic regime, the vibration energies are completely different, depending on the position of the crack opening. If the crack opening is located opposite the incident source, the vibration energy increases abruptly in the vicinity of the crack, which is affected by the higher-order non-propagating modes as well as the A1 modes. When the crack opening and the incident source are located on the same side, the generated energy approaches zero as the source moves closer to the crack. The energy reduction around the crack is caused by the superposition of the incident wave from dipole loading and the phase-inverted reflected wave. The results of experiments conducted to verify the energy variations in the vicinity of a crack were in good agreement with the numerical results for dipole loading.

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“…AMS can also achieve super-resolution imaging effects on sound waves [ 161 ]. A low-density single-phase hyperlens with a star-shaped lattice structure made of steel has double-negative parameter properties.…”

Section: Progress In Acoustic Metasurface Researchmentioning

confidence: 99%

Research Progress and Development Trends of Acoustic Metamaterials

Song¹,

Ding²,

Cui³

et al. 2021

Molecules

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Acoustic metamaterials are materials with artificially designed structures, which have characteristics that surpass the behavior of natural materials, such as negative refraction, anomalous Doppler effect, plane focusing, etc. This article mainly introduces and summarizes the related research progress of acoustic metamaterials in the past two decades, focusing on meta-atomic acoustic metamaterials, metamolecular acoustic metamaterials, meta-atomic clusters and metamolecule cluster acoustic metamaterials. Finally, the research overview and development trend of acoustic metasurfaces are briefly introduced.

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Super-resolution ultrasonic imaging of stiffness variations on a microscale active metasurface

Cited by 7 publications

References 29 publications

Soda Cans Metamaterial: A Subwavelength-Scaled Phononic Crystal

Soda Cans Metamaterial: A Subwavelength-Scaled Phononic Crystal

Vibration energy analysis of a plate for defect imaging with a scanning laser source technique

Research Progress and Development Trends of Acoustic Metamaterials

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