Adaptive GRIN lens based on piezoelectric metamaterial for acoustic beam focusing

Jiawen Xu; Shilong Li; J. Tang

doi:10.1117/12.2260341

17 April 2017 Adaptive GRIN lens based on piezoelectric metamaterial for acoustic beam focusing

Jiawen Xu, Shilong Li, J. Tang

Proceedings Volume 10164, Active and Passive Smart Structures and Integrated Systems 2017; 101641S (2017) https://doi.org/10.1117/12.2260341
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2017, Portland, Oregon, United States

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.

Conference Presentation

Citation Download Citation

Jiawen Xu, Shilong Li, and J. Tang "Adaptive GRIN lens based on piezoelectric metamaterial for acoustic beam focusing", Proc. SPIE 10164, Active and Passive Smart Structures and Integrated Systems 2017, 101641S (17 April 2017); https://doi.org/10.1117/12.2260341

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available