Focusing of Rayleigh waves with gradient-index phononic crystals

We report on the subwavelength focusing of Rayleigh waves using gradient-index (GRIN) phononic crystals (PCs) made of air holes scatters in a thick silicon substrate. The subwavelength focusing is demonstrated both in the inner and in the silicon substrate behind the GRIN PCs by using a non-contact...

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Bibliographic Details
Published in:Applied physics letters 2016-05, Vol.108 (22), p.221905-53504
Main Authors: Zhao, Jinfeng, Bonello, Bernard, Becerra, Loïc, Boyko, Olga, Marchal, Rémi
Format: Article
Language:English
Subjects:
Acoustics
AIR
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CRYSTALS
FOCUSING
HOLES
Mechanics
Physics
RAYLEIGH WAVES
SILICON
Silicon substrates
SOUND WAVES
SUBSTRATES
ZONES
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Summary:We report on the subwavelength focusing of Rayleigh waves using gradient-index (GRIN) phononic crystals (PCs) made of air holes scatters in a thick silicon substrate. The subwavelength focusing is demonstrated both in the inner and in the silicon substrate behind the GRIN PCs by using a non-contact experimental technique. In both situations, the focal zone was observed at the position, which is in very good agreement with our theoretical predictions, at a frequency in the sound cone free of radiation into the substrate.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4953168