Title :
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
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;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.922553
