We demonstrate the experimental realization of a multiresonant metamaterial for Lamb waves, i.e., elastic waves propagating in plates. The effect comes from resonances long aluminum rods that are attached to an plate. Using time-dependent measurements, we experimentally prove this exhibits wide band gaps as well sub- and suprawavelength modes both periodic random arrangement resonators. dispersion curve inside is predicted through hybridizations between flexural compressional slow fast...

We develop an analytical wave approach to describe the physics properties of multiresonant metamaterials for Lamb waves propagating in plates. The metamaterial that we characterize consists a 10 by uniform, periodic array long rods attached surface plate forms substrate which antisymmetric ${A}_{0}$ are excited. show propagation through can be accurately modeled using simplified theory replaces two-dimensional with one-dimensional beam linear rods. problem is solved rigorously this system...

Deep sub-wavelength focusing has been demonstrated for locally resonant metamaterials using electromagnetic and acoustic waves. The elastic equivalents of such objects are made resonating beams fixed to a two-dimensional plate, as presented here. Independent random or regular arrangement the resonators, metamaterial shows large bandgaps that independent incident wave direction. Numerical simulations demonstrate insertion defect in layout, shorter resonator, creates strong amplification...

This paper deals with the numerical design of a directional invisibility cloak for backward scattered elastic waves propagating in thin plate (A0 Lamb waves). The is based on set resonating beams that are attached perpendicular to and arranged at sub-wavelength scale ten concentric rings. exotic effective properties this locally resonant metamaterial ensure coexistence bandgaps cloaking certain beam configurations over large frequency band. best was obtained when resonators' length decreases...

In metamaterial science local resonance and hybridization are key phenomena strongly influencing the dispersion properties; metasurface discussed in this article created by a cluster of resonators, subwavelength rods, atop an elastic surface being exemplar with these features. On metasurface, band-gaps, slow or fast waves, negative refraction dynamic anisotropy can all be observed exploring frequencies wavenumbers from Floquet-Bloch problem using Brillouin zone. These extreme...

Abstract The human ear is a fascinating sensor, capable of detecting pressures over ten octaves frequency and twelve orders magnitudes. Here, following biophysical model, we demonstrate experimentally that the physics living cochlea can be emulated by an active one-dimensional acoustic metamaterial. latter solely consists on set subwavelength resonators, coupled to main propagating waveguide. By introducing gradient in resonators’ properties, establish experimental set-up which mimics...

Abstract Standing Lamb waves in vibrating plates enable haptic interfaces. If the out‐of‐plane displacement of these exceeds 1 µm at frequencies above 25 kHz, a silent friction modulation can be created between human finger and plate. A fully transparent friction‐modulation device based on piezoelectric thin film is demonstrated. The antisymmetric mode induced 73 kHz allows for functional performance that fulfills all conditions practical use. Out‐of‐plane reaches 2.9 when 150 V unipolar...

We present an approach to extract from the local measurement of a complex field wavelength tomography. In contrast with noise correlation techniques developed in recent years seismology or ultrasound, is under-sampled which opens applications slow imaging devices. Through simulations and experiments, it demonstrated that loss time and/or spatial coherence not obstacle for tomography reconstruction. application shear wave imaging: conventional ultrasonic scanner working at 25 Hz tested...

On-wrist vibrotactile feedback, such as provided through smartwatches, has been shown to have a positive impact on users' touch input performance with mobile devices, but the user experience of combined on-screen and on-wrist vibrations scarcely examined. In our experiment involving twenty-two participants, an eclectic three-faceted UX emerged: (i) both resulted in high ratings no significant differences UMUX scores or preferences; (ii) negatively-connoted descriptors, e.g., difficulty...

In this letter, we present super-resolution experiments from a single emission channel located in the far-field of an elastic metamaterial for Lamb waves. The experiment is performed kHz regime, with centimetric waves that are refocused numerically through cross-correlation computations. originality approach lies direct link established between results and wavefield dispersion induced by made long rods attached to plate, behave as sub-wavelength resonators. We believe such clear origin major...

We introduce cubic bubbles that are pinned to 3D printed millimetric frames immersed in water. Cubic more stable over time and space than standard spherical bubbles, while still allowing large oscillations of their faces. find each face can be described as a harmonic oscillator coupled the other ones. These resonators by gas inside cube but also acoustic interactions liquid. provide an analytical model numerical simulations predicting resonance with very good agreement. Acoustically, prove...

Abstract Transparent thin‐film piezoelectric transducers are attractive for haptic displays. However, their widespread use in consumer electronics, innovative and cost‐effective processing methods need to be developed. In this contribution the effectiveness of deposition lead zirconate titanate thin films by inkjet printing fabrication devices is demonstrated. The 1,3‐propanediol solvent used prepare effective inkjet‐printing inks from chemical solution solutions. printed structures on fused...

Abstract Locally resonant metamaterials derive their effective properties from hybridization between unit cells and the incoming wave. This phenomenon is well understood in case of plane waves that propagate media where cell respects symmetry incident field. However, many systems, several modes with orthogonal symmetries can coexist at a given frequency, while themselves have asymmetric scattering cross-sections. In this paper we are interested influence breaking on wave field includes...

Recently wide frequency band gaps were observed in an experimental realization of a multiresonant metamaterial for Lamb waves propagating thin plates. The rose from hybridization between the flexural plate (A0 waves) and longitudinal resonances rods attached perpendicularly. Shortly thereafter theory based on considering one-dimensional periodic array scattering matrix single rod successfully described observations. This letter presents alternative simpler theory, arguably accurate at high...

Abstract We study numerically the potential of a multimodal elastic metamaterial to filter and guide Lamb waves in plate. Using sub-wavelength array elongated beams attached plate, combining coupling effects longitudinal flexural motion these resonators, we create narrow transmission bands at resonances inside wide frequency bandgap induced by their resonance. The diameter becomes tuning parameter for selection leakage frequency, without affecting main bandgap. Finally, combination monopolar...

In this letter, an experimental and numerical study of the influence symmetric resonators on Lamb waves that propagate in a thin metallic plate is reported. The consist set small, closely packed rods pass through from side to create locally resonant metamaterial. Adjusting symmetry these creates degenerate flexural resonances can be tuned couple only with given mode either (S0) or anti-symmetric (A0). This approach offers promising perspectives development metamaterials for elastic involve...

Touch knobs usually require visual attention when performing a targeting task. This can draw the user's focus to device, which is not desirable if needed elsewhere. In this work, we investigated use of haptic feedback for touch another primary task that saturates attention. an experiment, compare three potential tactile designs no-feedback variant circular task, while saturating Our findings indicate two designs, namely, gradual+hapticObject and adaptive+hapticObject, providing user with...

Can we make good use of the degrees freedom a wave-field trapped in cavity to perform complete spatio-temporal inversion from single emitter? To answer these questions, used experiments conducted ultrasonic regime investigate water where energy was not homogeneously distributed over all freedom. While time reversal emitter gives poor results, show possibility recover optimal focusing by converting multi-channel technique inverse filter into single-channel method that call one-channel filter....