A spatially reversible and programmable piezoelectric metamaterial concept is introduced for the manipulation of surface acoustic waves to achieve on-demand wave mode conversion and reflection. The concept uses an array of inductive-shunted piezoelectric elements (with gradually varying inductors in space) attached to the surface of an elastic propagation domain. The value of each inductor directly controls the phase velocity of the Rayleigh wave locally as quantified through unit cell band diagram analysis that guides the design process. By varying the spatial inductance distribution, the proposed piezoelectric metamaterial domain can be programed to convert incident surface waves into bulk shear waves or reflect them completely. The location of surface-to-bulk wave mode conversion or wave reflection can be tailored by means of the inductance distribution, and the directional behavior in space can be reversed. The proposed concept may enable novel surface acoustic wave devices and filters, via digital or analog programmable shunt circuits.
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26 August 2019
Research Article|
August 26 2019
Programmable mode conversion and bandgap formation for surface acoustic waves using piezoelectric metamaterials Available to Purchase
Salih Alan;
Salih Alan
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology
, Atlanta, Georgia 30332, USA
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Ahmed Allam;
Ahmed Allam
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology
, Atlanta, Georgia 30332, USA
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Alper Erturk
Alper Erturk
a)
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology
, Atlanta, Georgia 30332, USA
a)Author to whom correspondence should be addressed: [email protected]
Search for other works by this author on:
Salih Alan
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology
, Atlanta, Georgia 30332, USA
Ahmed Allam
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology
, Atlanta, Georgia 30332, USA
Alper Erturk
a)
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology
, Atlanta, Georgia 30332, USA
a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 115, 093502 (2019)
Article history
Received:
May 20 2019
Accepted:
August 05 2019
Citation
Salih Alan, Ahmed Allam, Alper Erturk; Programmable mode conversion and bandgap formation for surface acoustic waves using piezoelectric metamaterials. Appl. Phys. Lett. 26 August 2019; 115 (9): 093502. https://doi.org/10.1063/1.5110701
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