Evidence of a broadband gap in a phononic crystal strip.
作者： Etienne Coffy , Sébastien Euphrasie , Mahmoud Addouche , Pascal Vairac , Abdelkrim Khelif
DOI: 10.1016/J.ULTRAS.2017.03.003
关键词: Silicon 、 Bragg's law 、 Attenuation 、 Dispersion (optics) 、 Optoelectronics 、 Optics 、 Materials science 、 Finite element method 、 Ultrasonic sensor 、 Band gap 、 Crystal
摘要: Abstract We experimentally demonstrate a very large ultrasonic band gap in one-dimensional phononic crystal. The structure consists of periodic tungsten pillars fixed to tailored silicon strip with layer epoxy. Combining local resonances and Bragg scattering, the ranges from 450 kHz 1250 kHz, which corresponds gap-to-midgap ratio 94%, attenuation exceeds 35 dB only three periods. Numerical calculations Finite Element Method are performed support analysis provide better understanding behavior structure. In particular, role thin epoxy is studied shown have strong influence on dispersion. This can be considered as new tool design acoustic devices high performances.
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