Shear Bloch waves and coupled phonon-polariton in periodic piezoelectric waveguides

Piliposyan, DG, Ghazaryan, KB and Piliposian, GT (2014) Shear Bloch waves and coupled phonon-polariton in periodic piezoelectric waveguides. ULTRASONICS, 54 (2). pp. 644-654.

Text Shear Bloch waves and coupled phonon polaritonR.pdf - Author Accepted Manuscript Download (1MB)

Abstract

Coupled electro-elastic SH waves propagating in a periodic piezoelectric finite-width waveguide are considered in the framework of the full system of Maxwell's electrodynamic equations. We investigate Bloch-Floquet waves under homogeneous or alternating boundary conditions for the elastic and electromagnetic fields along the guide walls. Zero frequency stop bands, trapped modes as well as some anomalous features due to piezoelectricity are identified. For mixed boundary conditions, by modulating the ratio of the length of the unit cell to the width of the waveguide, the minimum widths of the stop bands can be moved to the middle of the Brillouin zone. The dispersion equation has been investigated also for phonon-polariton band gaps. It is shown that for waveguides at acoustic frequencies, acousto-optic coupling gives rise to polariton behavior at wavelengths much larger than the length of the unit cell but at optical frequencies polariton resonance occurs at wavelengths comparable with the period of the waveguide.

Item Type:	Article
Additional Information:	## TULIP Type: Articles/Papers (Journal) ## official_url: www.ncbi.nlm.nih.gov/pubmed/24139302
Uncontrolled Keywords:	Piezoelectric phononic crystal, Bang gaps, Floquet theory, Phonon-polariton
Depositing User:	Symplectic Admin
Date Deposited:	07 Dec 2018 11:43
Last Modified:	19 Jan 2023 01:09
DOI:	10.1016/j.ultras.2013.09.018
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3029686