Angle-dependent ultrasonic transmission through plates with subwavelength hole arrays

We study sound transmission in perforated plates as a function of incident angle and conclude that it holds distinctive properties that make it unique and essentially different from optical transmission through perforated metallic plates. More precisely, we conclude the following: (a) similar to its optical counterpart, acoustic transmission minima respond to Wood anomalies in which the periodicity plays a central role; (b) in contrast to both the optical case and the acoustical case with slits, homogeneous-plate modes (Lamb and Scholte-Stoneley modes) are strongly coupled to lattice and Fabry-P\'erot resonances. This gives rise to unique transmission behavior, thus opening new perspectives for exotic wave phenomena.
Comment: 4 figures. Submitted to Phys. Rev. Lett