[EN] We present deep-subwavelength diffusing surfaces based on acoustic metamaterials, namely metadiffusers. These sound diffusers are rigidly backed slotted panels, with each slit being loaded by an array of Helmholtz ...
González Mateo, Enrique Manuel(Universitat Politècnica de València, 2022-01-12)
[ES] En este trabajo se describe teórica y numéricamente un metamaterial acústico basado en poros
que producen una absorción cuasi perfecta en transmisión. Los poros están optimizados para
soportar resonancias simétricas ...
Romero-García, Vicente; Pagneux, Vincent; Groby, J.P.; Jimenez, Noe; Ballestero, Eric(Centre d'information et de documentation sur le bruit (France), 2020)
[FR] Dans ce travail, nous montrons les possibilités des métamatériaux acoustiques pour la conception de matériaux structurés sublongueur d'onde dans les cas de l¿absorption parfaite et la diffusion du son. Basé sur les ...
[EN] When a surface vibrates compressing the medium on its front, it generates acoustic waves. This is the case of loudspeakers, which generate acoustic waves at audible frequencies by means of a moving surface. In this ...
Jimenez, Noe; Tournat, Vincent; Romero García, Vicente; Sánchez Morcillo, Víctor José(Acoustical Society of America, 2018-07-09)
[EN] In solids, the constitutive relations between strain and stress lead in most cases to a dominant quadratic nonlinear response. However, there exist some solid materials that exhibit negative quadratic nonlinearity, ...
Rodríguez-Sendra, Josep; Jimenez, Noe; Picó Vila, Rubén; Faus, Joan; Camarena Femenia, Francisco(Institute of Electrical and Electronics Engineers, 2019-10)
[EN] We report a method to monitor the setting process of bone-graft substitutes (calcium sulfate) using ultrasonic backscattering techniques. Analyzing the backscattered fields using a pulse-echo technique, we show that ...
Archilla, J.F.R.; Kosevich ., Yuri; Jimenez, Noe; Sánchez Morcillo, Víctor José; García-Raffi, L. M.(Department of Physics and Astronomy of the National Academy of Sciences of Ukraine, 2013)
We consider a model made out of identical particles that repel each other with the Coulomb interaction. We study numerically and analytically the existence and properties of supersonic kinks, showing that they are very ...
[EN] Single-element focused ultrasound devices have demonstrated its ability to non-invasively open the Blood Brain Barrier. However, skull irregularities and absorption produce strong aberrations in the ultrasound focus. ...
Barguet, L.; Romero-García, V.; Jimenez, Noe; García-Raffi, L. M.; Sánchez Morcillo, Víctor José; Groby, J.-P.(Nature Publishing Group, 2021-01-12)
[EN] We present a 3-dimensional fully natural sonic crystal composed of spherical aggregates of fibers (called Aegagropilae) resulting from the decomposition of Posidonia Oceanica. The fiber network is first acoustically ...
Jiménez González, Noe(Universitat Politècnica de València, 2015-07-15)
[EN] Nature is nonlinear. The linear description of physical phenomena is useful for explain observations with the simplest mathematical models, but they are only accurate for a limited range of input values. In the case ...
Mehrem, Ahmed; Jimenez, Noe; Salmerón-Contreras, L. J.; García-Andrés, Francesc Xavier; García-Raffi, L. M.; Picó Vila, Rubén; Sánchez Morcillo, Víctor José(American Physical Society, 2017)
[EN] The propagation of nonlinear waves in a lattice of repelling particles is studied theoretically and experimentally. A simple experimental setup is proposed, consisting of an array of coupled magnetic dipoles. By driving ...
Camarena Femenia, Francisco; Adrián Martínez, Silvia; Jimenez, Noe; Sánchez Morcillo, Víctor José(Acoustical Society of America, 2013-08)
The phenomenon of the displacement of the position along the axis of the pressure, intensity, and radiation force maxima of focused acoustic beams under increasing driving voltages (nonlinear focal shift) is studied for ...
Jimenez, Noe; Romero García, Vicente; Picó Vila, Rubén; García-Raffi, L. M.; Staliünas, Kestutis(American Institute of Physics (AIP), 2015-11-16)
We report the nonlinear focusing of ultrasonic waves by an axisymmetric diffraction grating immersed in water. In the linear regime, the system presents high focal gain (32 dB), with a narrow beam-width and intense side ...
Jimenez, Noe; Mehrem, Ahmed; Picó Vila, Rubén; García-Raffi, L. M.; Sánchez Morcillo, Víctor José(Elsevier Masson, 2016-05)
The propagation of intense acoustic waves in a one-dimensional phononic crystal is studied. The medium consists in a structured fluid, formed by a periodic array of fluid layers with alternating linear acoustic properties ...
Hamham, El Mokhtar; Jimenez, Noe; Picó Vila, Rubén; Sánchez Morcillo, Víctor José; García-Raffi, L. M.; Staliünas, Kestutis(American Physical Society, 2015-08-06)
We report the propagation of high-intensity sound beams in a sonic crystal, under self-collimation or reduced-divergence conditions. The medium is a fluid with elastic quadratic nonlinearity, where the dominating nonlinear ...
[EN] Including non-squared frequency dependent attenuation is essential to obtain accurate acoustic predictions in biological media
when wide-band signals and/or nonlinear effects are taken into account. Thus, a time ...
[EN] Acoustic holograms can encode complex wavefronts to compensate the aberrations of a therapeutical ultrasound beam propagating through heterogeneous tissues such as the skull, and simultaneously, they can generate ...
[EN] The correction of transcranial focused ultrasound aberrations is a relevant topic for enhancing various non-invasive medical treatments. Presently, the most widely accepted method to improve focusing is the emission ...
[EN] When finite amplitude ultrasound propagation is considered, changes in spatial features of focused ultrasound beams can be
observed. These nonlinear effects typically appear in thermoviscous fluids as focal displacements, ...
[EN] One of the key trends in laser material processing is the usage of structured laser beams. Collimated and focused Gaussian beams are the most common tools; however, more exotic beams can be beneficial too. For instance, ...