We have investigated controlling the phase velocity of a surface acoustic wave (SAW) by a microelectromechanical switch fabricated on a high coupling piezoelectric substrate. The principle is based on the interaction of the evanescent surface potential of the SAW with the conductive switch. In theory tuning of the velocity in the range given by v0 and vm, i.e. the velocity for a SAW on a free and metallized substrate, is possible. We have achieved up to 17.6 m/s (0.44 %) velocity tuning on 128degYX LiNbO3. A maximum velocity sensitivity of Deltav/v of 15times10-3/V and phase sensitivity of 700deg/V was measured. This is five orders of magnitude larger than values obtained for electrical field tuning.

P0-13 Phase Velocity Control of Surface Acoustic Waves Based on Surface Shorting and Electrical Field Application Using MEMS Switches

Kinetics of ferroelectric switching in poled barium titanate ceramics: Effects of electrical cycling rate

Hirshfeld surface, etching, mechanical and electrical enhancement analyses of pyramid pattern of Xylenol Orange dye in Triglycine Sulphate single crystals

Rate-dependent ferroelectric switching in barium titanate ceramics from modified PUND experiments

http://ieeexplore.ieee.org/iel5/10287/32720/01535983.pdf

H. Neumann

Papers

The Deformation of Hysteresis Curves by an Internal Bias in Ferroelectric Ceramics