CUED Publications database

Guided propagation of surface acoustic waves and piezoelectric field enhancement in ZnO/GaAs systems

Pedrós, J and García-Gancedo, L and Ford, CJB and Barnes, CHW and Griffiths, JP and Jones, GAC and Flewitt, AJ (2011) Guided propagation of surface acoustic waves and piezoelectric field enhancement in ZnO/GaAs systems. Journal of Applied Physics, 110. ISSN 0021-8979

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Abstract

The characteristics and dispersion of the distinct surface acoustic waves (SAWs) propagating in ZnO/GaAs heterostructures have been studied experimentally and theoretically. Besides the Rayleigh mode, strong Sezawa modes, which propagate confined in the overlayer, arise due to the smaller sound velocity in ZnO than in the substrate. The design parameters of the structure providing the strongest piezoelectric field at a given depth within the layered system for the different modes have been determined. The piezoelectric field of the Rayleigh mode is shown to be more than 10 times stronger at the interface region of the tailored ZnO/GaAs structure than at the surface region of the bulk GaAs, whereas the same comparison for the first Sezawa mode yields a factor of 2. This enhancement, together with the capacity of selecting waves with different piezoelectric and strain field depth profiles, will facilitate the development of SAW-modulated optoelectronic applications in GaAs-based systems. © 2011 American Institute of Physics.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:30
Last Modified: 08 Dec 2014 02:29
DOI: 10.1063/1.3660215