Time-domain imaging of gigahertz surface waves on an acoustic metamaterial

Otsuka, Paul H.; Mézil, Sylvain; Matsuda, Osamu; Tomoda, Motonobu; Maznev, A. A.; Gan, Thomas; Fang, Nicholas X.; Boechler, Nicholas; Gusev, Vitalyi; Wright, Oliver B.

doi:10.1088/1367-2630/aa9298

Cited by 31 publications

(22 citation statements)

References 44 publications

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“…Minor changes are introduced along the other directions due to the different unit-cell periodicity. In addition, we believe that a similar tuning paradigm could be implemented at the microscale and nanoscale, where contact-based metamaterials made of micro-and nanobeads deposited on a silica substrate have already been utilized to filter SAWs in the rf regime [12][13][14]. Within this context, resonance tuning via a magnetic field could be achieved by employing, for example, magnetic microbeads, similar to those already commercialized for magnetic separation techniques [42], and modulating their contact resonances via an external magnetic field.…”

Section: Discussionmentioning

confidence: 99%

“…The same hybridization phenomenon is observed when SAWs interact with a granular layer of silica microbeads, owing to the contact resonance of each sphere adhered to the elastic substrate. These granular metamaterials have been thoroughly investigated with the goal of understanding the microbeads' * antonio.palermo6@unibo.it contact dynamics [12,13] and to realize SAW filters in the megahertz and gigahertz range [14].…”

Section: Introductionmentioning

confidence: 99%

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Tuning of Surface-Acoustic-Wave Dispersion via Magnetically Modulated Contact Resonances

et al. 2019

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In this work, we propose the use of contact resonances, controlled via an external magnetic field, as a tunable platform to manipulate the dispersion of surface acoustic waves (SAWs). We exploit the analogy between surface acoustic waves in a semi-infinite medium and edge waves in a plate, to realize a compact experimental setup and to demonstrate our tuning strategy. The setup consists of a set of ferromagnetic bead resonators in contact with thin, permanent magnets and positioned at the free edge of an elastic plate. An additional set of magnets, placed at a controlled and variable distance from the beads, is used to alter the contact stiffness and natural frequencies of the bead resonators. We exploit resonances to open large-frequency band gaps via edge-wave hybridization and implement our tuning strategy to shift their frequency ranges. We predict the tuned dispersive properties of hybridized edge waves via numerical models and experimentally reconstruct them via laser vibrometry, finding excellent agreement. The use of magnetic interaction and contact mechanics as a tuning strategy for SAW systems could pave the way toward programmable devices for sensing and electronic components.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tuning of Surface-Acoustic-Wave Dispersion via Magnetically Modulated Contact Resonances

et al. 2019

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“…[157] Another self-assembly method is the wedgeshaped cell convective technique, implemented to build an AMM for gigahertz imaging capabilities, also exploiting contact mechanics ( Figure 7d). [149] These examples show how self-assembly techniques can transform random colloidal dispersions into functional AMMs or PCs for acoustic applications.…”

Section: Arrangement and Assembly Methodsmentioning

confidence: 99%

Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

et al. 2020

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Acoustic metamaterials (AMMs) and phononic crystals (PCs) have garnered significant attention in recent years, as part of the collective driving force toward creating intelligent acoustic devices. Advancements in these fields have greatly enhanced the way we manipulate sound waves through transmission, reflection, refraction, absorption, diffraction, or attenuation. In the past decade, AMMs and PCs have enabled novel applications such as acoustic lensing, [1-3] cloaking, [4] levitation, [5] and holography. [6-8] While these exotic structures have been well explored through theoretical and numerical analysis, [9-13] their physical realization is an important topic that is rarely discussed. Considering the ubiquity of sound and the powerful capabilities of AMMs and PCs, the impact of these acoustic structures could be phenomenal. Across the full acoustic frequency spectrum, practical applications such as noise cancellation, [14] underwater detection, [15] medical imaging, [16] and energy harvesting [17,18] could benefit key sectors in our society like healthcare, well-being, environmental sustainability, and security. Moreover, AMMs and PCs can help to usher in next-generation technologies for personalized, immersive multisensory [19-22] experiences. The manipulation of sound can enrich the way we communicate and interact with our surroundings, not simply through audio, but also through tactile sensations. In the future, AMMs and PCs could be used in virtual reality (VR) setups, [23] compact wearable devices, and dynamic midair volumetric displays [24] that are controllable and capable of providing haptic feedback. [25] Beyond the notion that AMMs and PCs can replace phased arrays, they could readily complement one another for more precise control. In commercial devices, AMM and PC functionalities could even be combined together in different ways, e.g., transmissive and sound absorptive structures, for improved performance. To unlock the full potential of AMMs and PCs, it is therefore vital to ensure that practical, physical realization is pursued alongside theoretical investigation in the development of viable acoustic designs. Building an AMM or PC requires some form of fabrication or assembly or both. Fabrication refers to the technologies and processes used to manufacture an object, whereas assembly refers to the strategic amalgamation of parts for a constructive purpose.

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“…The third strategy enabling the modification of SAWs dispersion is based on the nanoparticle–substrate contact resonance. This effect was first investigated in the sub‐gigahertz regime by the pump‐probe transient grating (TG) technique and time‐domain imaging in PnCs made out of self‐assembled silica microspheres adhered to an aluminium‐coated glass substrate. Recent follow up of the TG study has revealed additional features in the gigahertz range such as contact‐induced splitting of the vibrational modes of nanoparticles and the interaction of these modes with Rayleigh SAWs .…”

Section: Surface and Membrane Hypersonic 2d Pncsmentioning

confidence: 99%

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

Sledzinska

Graczykowski

Maire

et al. 2019

Adv Funct Materials

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The central concept in phononics is the tuning of the phonon dispersion relation, or phonon engineering, which provides a means of controlling related properties such as group velocity or phonon interactions and, therefore, phonon propagation, in a wide range of frequencies depending on the geometries and sizes of the materials. Phononics exploits the present state of the art in nanofabrication to tailor dispersion relations in the range of GHz for the control of elastic waves/phonons propagation with applications toward new information technology concepts with phonons as state variable. Moreover, phonons provide an adaptable approach for supporting a coherent coupling between different state variables, and the development of nanoscale optomechanical systems during the last decade attests this prospect. The most extended approach to manipulate the phonon dispersion relation is introducing an artificial periodic modulation of the elastic properties, which is referred to as phononic crystal (PnC). Herein, the focus is on the recent experimental achievements in the fabrication and application of 2D PnCs enabling the modification of the dispersion relation of surface and membrane modes, and presenting phononic bandgaps, waveguiding, and confinement in the hypersonic regime. Furthermore, these artificial materials offer the potential of modifying and controlling the heat flow to enable new schemes in thermal management.

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Time-domain imaging of gigahertz surface waves on an acoustic metamaterial

Cited by 31 publications

References 44 publications

Tuning of Surface-Acoustic-Wave Dispersion via Magnetically Modulated Contact Resonances

Tuning of Surface-Acoustic-Wave Dispersion via Magnetically Modulated Contact Resonances

Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering

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