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Listar por autor "Staliünas, Kestutis"

Mostrando ítems 1-13 de 13

Acoustic Bessel-like beam formation by an axisymmetric grating

Jimenez, Noe; Romero García, Vicente; Picó Vila, Rubén; Cebrecos Ruiz, Alejandro; Sánchez Morcillo, Víctor José; García-Raffi, L. M.; Sánchez Pérez, Juan Vicente; Staliünas, Kestutis (European Physical Society, 2014-04)

We report Bessel-like beam formation of acoustic waves by means of an axisymmetric grating of rigid tori. The results show that the generated beam pattern is similar to that of Bessel beams, characterized by elongated ...
Angular bandgaps in sonic crystals: evanescent waves and spatial complex dispersion relation

Romero García, Vicente; Picó Vila, Rubén; Cebrecos Ruiz, Alejandro; Staliünas, Kestutis; Sánchez Morcillo, Víctor José (American Society of Mechanical Engineers (ASME), 2013-08)

Phononic crystals are artificial materials made of a periodic distribution of solid scatterers embedded into a solid host medium with different physical properties. An interesting case of phononic crystals, known as sonic ...
Beam focusing in reflections from flat subwavelength diffraction gratings

Cheng, Yu Chieh; Redondo, Javier; Staliünas, Kestutis (American Physical Society, 2014-03-10)

We predict that narrow beams, reflecting from flat subwavelength diffraction gratings, can focus. The effect is shown for the beams of electromagnetic radiation; however, it should be observable for beams of waves of ...
Enhanced of sound by soft reflections in exponentially chirped crystals

Cebrecos Ruiz, Alejandro; Picó Vila, Rubén; Sánchez Morcillo, Víctor José; Staliünas, Kestutis; Romero García, Vicente; García-Raffi, L. M. (American Institute of Physics (AIP): Open Access Journals, 2014-12)

The enhancement of sound inside a two dimensional exponentially chirped crystal during the soft reflections of waves is experimentally and theoretically explored in this work. The control of this enhancement is achieved ...
Enhanced transmission band in periodic media with loss modulation

Cebrecos Ruiz, Alejandro; Picó Vila, Rubén; Romero García, Vicente; Yasser, A. M.; Maigyte, L.; Herrero, R.; Botey, M.; Sánchez Morcillo, Víctor José; Staliünas, Kestutis (American Institute of Physics (AIP), 2014-11-17)

We study the propagation of waves in a periodic array of absorbing layers. We report an anomalous increase of wave transmission through the structure related to a decrease of the absorption around the Bragg frequencies. ...
Enhancement of sound in chirped sonic crystals

Romero García, Vicente; Picó Vila, Rubén; Cebrecos Ruiz, Alejandro; Sánchez Morcillo, Víctor José; Staliünas, Kestutis (American Institute of Physics (AIP), 2013)

We propose and experimentally demonstrate a mechanism of sound wave concentration based on soft reflections in chirped sonic crystals. The reported controlled field enhancement occurs at around particular (bright) planes ...
Evidences of spatial (angular) filtering of sound beams by sonic crystals

Picó Vila, Rubén; Pérez Arjona, Isabel; Sánchez Morcillo, Víctor José; Staliünas, Kestutis (Elsevier, 2013-07)

We report experimental evidences of spatial (angular) filtering of sound beams propagating through sonic crystals. We show that at specific frequencies of the incident wave the paraxial plane wave compo- nents of the beam ...
Formation of collimated sound beams by three-dimensional sonic crystals

Cebrecos Ruiz, Alejandro; Romero García, Vicente; Picó Vila, Rubén; Pérez Arjona, Isabel; Espinosa Roselló, Víctor; Sánchez Morcillo, Víctor José; Staliünas, Kestutis (American Institute of Physics (AIP), 2012-05-15)

[EN] A theoretical and experimental study of the propagation of sound beams in- and behind three-dimensional sonic crystals at frequencies close to the band edges is presented. An efficient collimation of the beam behind ...
Formation of high-order acoustic Bessel beams by spiral diffraction gratings

Jimenez, Noe; Picó Vila, Rubén; Sánchez Morcillo, Víctor José; Romero García, Vicente; García-Raffi, L. M.; Staliünas, Kestutis (American Physical Society, 2016-11-23)

The formation of high-order Bessel beams by a passive acoustic device consisting of an Archimedes' spiral diffraction grating is theoretically, numerically, and experimentally reported in this paper. These beams are ...
Nonlinear focusing of ultrasonic waves by an axisymmetric diffraction grating embedded in water

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 ...
Nonlinear self-collimated sound beams in sonic crystals

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 ...
Propagation of sound beams behind sonic crystals

Sánchez Morcillo, Víctor José; Staliünas, Kestutis; Espinosa Roselló, Víctor; Pérez Arjona, Isabel; Redondo, Javier; Soliveres, Ester (American Physical Society, 2009-10)

A theoretical and experimental study of the propagation of sound beams in and behind two-dimensional sonic crystals at frequencies close to the band edges is presented. Beam focusing is predicted and discussed. We evaluate, ...
Unlocked evanescent waves in periodic structures

Botey, Muriel; Cheng, Yu-Chieh; Romero García, Vicente; Picó Vila, Rubén; Herrero, Ramon; Sánchez Morcillo, Víctor José; Staliünas, Kestutis (Optical Society of America, 2013-06-01)

We predict the existence of evanescent modes with unlocked phases in two-dimensional (2D) dielectric periodic structures. Contrary to what is known for one-dimensional structures, where evanescent fields lock to the host ...