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Proceedings Paper

Adaptive GRIN lens based on piezoelectric metamaterial for acoustic beam focusing
Author(s): Jiawen Xu; Shilong Li; J. Tang
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Paper Abstract

Due to the attractive potential in elastic wave attenuation and wave guiding, acoustic metamaterials have received much attention. Different from the more conventional metamaterials that possess only mechanical displacement/deformation, the electro-mechanical metamaterials analyzed in this paper utilize the two-way electromechanical coupling of piezoelectric transducers and local resonance induced by LC (inductor-capacitor) shunt circuits, which features enlarged design space as well as adaptivity. We report an adaptive piezoelectric gradient index (GRIN) lens featuring focusing acoustic wave. The proposed GRIN lens is comprised of arrayed piezoelectric unit-cells with individually connected inductive shunt circuits. Taking advantage of wave velocity shifting in the vicinity of local resonant frequency of unit-cell and specifically arranged LC shunt circuits, we can focus the transverse wave adaptively by adjusting the inductive loads, i.e., tuning the inductances. Analytical investigations and finite element simulations are performed. This tunable GRIN lens can be used as acoustic metamaterial for various acoustic devices operating with broadband frequencies.

Paper Details

Date Published: 17 April 2017
PDF: 9 pages
Proc. SPIE 10164, Active and Passive Smart Structures and Integrated Systems 2017, 101641S (17 April 2017); doi: 10.1117/12.2260341
Show Author Affiliations
Jiawen Xu, Univ. of Connecticut (United States)
Shilong Li, Univ. of Connecticut (United States)
J. Tang, Univ. of Connecticut (United States)

Published in SPIE Proceedings Vol. 10164:
Active and Passive Smart Structures and Integrated Systems 2017
Gyuhae Park, Editor(s)

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