Superwide-angle acoustic propagations above the critical angles of the Snell law in liquid–solid superlattice
Zhang Sai (张赛)a, Zhang Yu (张宇)a b, Gao Xiao-Wei (高晓薇)a
a Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education, Xiamen University, Xiamen 361005, China;
b State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 351005, China
In this paper, superwide-angle acoustic propagations above the critical angles of the Snell law in liquid–solid superlattice are investigated. Incident waves above the critical angles of the Snell law usually inevitably induce total reflection. However, incident waves with big oblique angles through the liquid–solid superlattice will produce a superwide angle transmission in a certain frequency range so that total reflection does not occur. Together with the simulation by finite element analysis, theoretical analysis by using transfer matrix method suggests the Bragg scattering of the Lamb waves as the physical mechanism of acoustic wave super-propagation far beyond the critical angle. Incident angle, filling fraction, and material thickness have significant influences on propagation. Superwide-angle propagation phenomenon may have potential applications in nondestructive evaluation of layered structures and controlling of energy flux.
(Ultrasonics, quantum acoustics, and physical effects of sound)
Fund:
Project supported by the National Natural Science Foundation of China (Grant Nos. 41276040 and 11174240) and the Natural Science Foundation of Fujian Province, China (Grant No. 2012J06010).
Zhang Sai (张赛), Zhang Yu (张宇), Gao Xiao-Wei (高晓薇) Superwide-angle acoustic propagations above the critical angles of the Snell law in liquid–solid superlattice 2014 Chin. Phys. B 23 124301
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