Abstract：
:We experimentally demonstrate a very large ultrasonic band gap in a one-dimensional phononic crystal. The structure consists of periodic tungsten pillars fixed to a tailored silicon strip with a layer of epoxy. Combining local resonances and Bragg scattering, the gap ranges from 450kHz to 1250kHz, which corresponds to a gap-to-midgap ratio of 94%, and the attenuation exceeds 35dB with only three periods. Numerical calculations with the Finite Element Method are performed to support the analysis and provide a better understanding of the behavior of the structure. In particular, the role of the thin layer of epoxy is studied and is shown to have a strong influence on the dispersion. This phononic structure with a very large band gap can be considered as a new tool to design acoustic devices with high performances.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Coffy E,Euphrasie S,Addouche M,Vairac P,Khelif Adoi
10.1016/j.ultras.2017.03.003subject
Has Abstractpub_date
2017-07-01 00:00:00pages
51-56eissn
0041-624Xissn
1874-9968pii
S0041-624X(17)30211-1journal_volume
78pub_type
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