Acoustic transmission enhancement through a stiff plate drilled with subwavelength side openings
Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University - Wuhan 430072, China
Accepted: 20 January 2011
We study the acoustic transmission through a water-immersed brass plate drilled with a one-dimensional periodical array of rectangular side openings. This new geometry can reveal well the unique properties in acoustic systems, which are rooted in the complex coupling between the longitudinal and transverse waves. Besides the transmission peaks related with regular cavity modes, we observe two additional types of subwavelength peaks. One stems from the resonant excitation of the coupled nonleaky Lamb modes, and the other corresponds to the excitation of the standing plate modes. In particular, the latter is robust in the subwavelength region and has attracted no attention previously.
PACS: 43.20.+g – General linear acoustics / 42.79.Dj – Gratings / 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound
© EPLA, 2011