Volume 104, Number 3, November 2013
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||03 December 2013|
Acoustic surface-guided modes in phononic crystals
1 Key Lab of Acoustic and Photonic Materials and Devices of Ministry of Education and Department of Physics, Wuhan University - Wuhan 430072, China
2 Department of Physics, Jishou University - Jishou 416000, Hunan, China
3 Department of physics, Hong Kong University of Science and Technology - Clear Water Bay, Kowloon, Hong Kong
Received: 23 August 2013
Accepted: 5 November 2013
We study theoretically and experimentally the nature of formation and properties of acoustic surface-guided modes (SGMs) at the interface of two phononic crystals (PCs). It is demonstrated that in the shared region of the frequency gaps, the SGMs can exist at the interface as a result of total reflections from both PCs, which causes the formation of nodal planes by the interference of the forward- and backward-propagating waves. The experiments show excellent agreement with the theory predictions.
PACS: 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound / 42.79.Dj – Gratings / 63.20.-e – Phonons in crystal lattices
© EPLA, 2013
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