Angle-dependent ultrasonic transmission through plates with subwavelength hole arrays.
We study the angle and frequency dependence of sound transmission through water-immersed perforated aluminum plates. Three types of resonances are found to govern the acoustic properties of the plates: lattice resonances in periodic arrays, Fabry-Perot modes of the hole cavities, and elastic Lamb modes. The last two of them are still present in random arrays and have no parallel in optical transmission through holes. These modes are identified by comparing experiment with various levels of theoretical analysis, including full solution of the elasto-acoustic wave equations. We observe strong mixture of different transmission mechanisms, giving rise to unique acoustic behavior and opening new perspectives for exotic wave phenomena.
Estrada
Héctor
H
Centro de Tecnologías Físicas, Unidad Asociada ICMM-CSIC/UPV, Universidad Politécnica de Valencia, Avenida de los Naranjos s/n. 46022 Valencia, Spain.
García de Abajo
F Javier
FJ
Candelas
Pilar
P
Uris
Antonio
A
Belmar
Francisco
F
Meseguer
Francisco
F