Refractive acoustic devices for airborne sound.
We show that a sonic crystal made of periodic distributions of rigid cylinders in air acts as a new material which allows the construction of refractive acoustic devices for airborne sound. It is demonstrated that, in the long-wave regime, the crystal has low impedance and the sound is transmitted at subsonic velocities. Here, the fabrication and characterization of a convergent lens are presented. Also, an example of a Fabry-Perot interferometer based on this crystal is analyzed. It is concluded that refractive devices based on sonic crystals behave in a manner similar to that of optical systems.
Cervera
F
F
Centro Tecnológico de Ondas, Unidad Asociada de Investigación (CSIC-UPV), Edificio de Institutos II, Universidad Politécnica de Valencia, E-46022 Valencia, Spain.
Sanchis
L
L
Sánchez-Pérez
J V
JV
Martínez-Sala
R
R
Rubio
C
C
Meseguer
F
F
López
C
C
Caballero
D
D
Sánchez-Dehesa
J
J