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Proceedings Paper

Elastic filter based on coupled resonator waveguides in phononic crystal slabs
Author(s): Abdelkrim Khelif; Saeed Mohammadi; Ali Eftekhar; Ali Adibi; Boujemaa Aoubiza
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Paper Abstract

In this paper we demonstrate the possibility of forming a new elastic filter structure based on the coupled resonator waveguides in phononic crystal slabs (CRAW) with superior performance over the conventional filters. The structures are made by etching a honeycomb array of holes in a free standing slab. This phononic slab structure exhibits an absolute phononic band gap for all polarizations of guided waves inside the slab including the Lamb and Love waves. We present an analysis of a different family of waveguides in phononic-crystal slabs, and illustrate the considerations that must be applied to achieve single-mode guided bands in these structures. Consequently, an unusual family of selective elastic filters composed of several single resonators that are coupled periodically through evanescent waves is obtained. The elastic energy is localized in the extended defect formed by the collective coupled resonators. The frequencies of the filters are sensitive to the geometrical parameters and to the separation distance between the indiviual resonators. Numerical simulations are performed using the finite element method and considering Zinc-Oxide slab.

Paper Details

Date Published: 24 February 2010
PDF: 10 pages
Proc. SPIE 7609, Photonic and Phononic Crystal Materials and Devices X, 76090X (24 February 2010); doi: 10.1117/12.849046
Show Author Affiliations
Abdelkrim Khelif, GeorgiaTech-CNRS Joint Lab. (United States)
Institut FEMTO-ST, Univ. de Franche-Comté (France)
Saeed Mohammadi, Georgia Institute of Technology (United States)
Ali Eftekhar, Georgia Institute of Technology (United States)
Ali Adibi, Georgia Institute of Technology (United States)
Boujemaa Aoubiza, Univ. de Franche-Comté (France)


Published in SPIE Proceedings Vol. 7609:
Photonic and Phononic Crystal Materials and Devices X
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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