title: Acoustic surface evanescent wave and its dominant contribution to extraordinary acoustic transmission and collimation of sound.
abstract: We demonstrate both theoretically and experimentally the physical mechanism that underlies extraordinary acoustic transmission and collimation of sound through a one-dimensional decorated plate. A microscopic theory considers the total field as the sum of the scattered waves by every periodically aligned groove on the plate, which divides the total field into far-field radiative cylindrical waves and acoustic surface evanescent waves (ASEWs). Different from the well-known acoustic surface waves like Rayleigh waves and Lamb waves, ASEW is closely analogous to a surface plasmon polariton in the optical case. By mapping the total field, the experiments well confirm the theoretical calculations with ASEWs excited. The establishment of the concept of ASEW provides a new route for the integration of subwavelength acoustic devices with a structured solid surface.
authors.affiliation: National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing, 210093, People's Republic of China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhou
authors.forename: Ming-Hui
authors.initials: MH
authors.lastname: Lu
authors.forename: Liang
authors.initials: L
authors.lastname: Feng
authors.forename: Xu
authors.initials: X
authors.lastname: Ni
authors.forename: Yan-Feng
authors.initials: YF
authors.lastname: Chen
authors.forename: Yong-Yuan
authors.initials: YY
authors.lastname: Zhu
authors.forename: Shi-Ning
authors.initials: SN
authors.lastname: Zhu
authors.forename: Nai-Ben
authors.initials: NB
authors.lastname: Ming