The Bleustein-Gulyaev wave mode in potassium niobate for liquid sensing applications

Author

Zhang, Chao ; Caron, Joshua J. ; Vetelino, John F.

Author_Institution

Lab. for Surface Sci. & Technol., Maine Univ., Orono, ME, USA

Volume

1

fYear

2000

fDate

36800

Firstpage

263

Abstract

The Surface acoustic wave (SAW) velocities and the associated mechanical and electric fields for the Z-axis cylinder family of cuts in potassium niobate (KNbO₃) have been theoretically calculated. It is found that these cuts support pure shear horizontal (SH) SAWs or Bleustein-Gulyaev (BG) waves with displacements in the surface plane and perpendicular to the propagation direction and an electric field in the sagittal plane. The piezoelectric coupling coefficient is predicted to have a maximum of 53%, which is significantly larger than any SAW coupling coefficient observed in LiNbO₃, LiTaO₃ or quartz. Since the SH SAW is not damped when loaded with a liquid, the Z-axis cylinder cuts of KNbO₃ may offer promising piezoelectric substrates for liquid phase acoustic wave sensors

Keywords

chemical sensors; piezoelectric materials; potassium compounds; surface acoustic wave sensors; surface acoustic waves; Bleustein-Gulyaev wave; KNbO₃; SAW velocity; electric field; liquid phase acoustic wave sensor; mechanical field; piezoelectric coupling coefficient; potassium niobate substrate; shear horizontal surface acoustic wave; Acoustic measurements; Acoustic propagation; Acoustic sensors; Acoustic waves; Frequency; Gratings; Mechanical sensors; Niobium compounds; Surface acoustic wave devices; Surface acoustic waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2000 IEEE

Conference_Location

San Juan

ISSN

1051-0117

Print_ISBN

0-7803-6365-5

Type

conf

DOI

10.1109/ULTSYM.2000.922553

Filename

922553