Title :
Measurements of Bleustein-Gulyaev waves in Li/sub 2/B/sub 4/O/sub 7/ crystal
Author :
Soluch, Waldemar
Author_Institution :
Inst. of Electron. Mater. Technol., Warsaw, Poland
Abstract :
Properties of Bleustein-Gulyaev waves (BGW) in Li/sub 2/B/sub 4/O/sub 7/ crystal were determined from the measured parameters of a delay line with double electrode interdigital transducers (IDT). Since the frequency response at the third harmonic was in good agreement with the SAW equivalent circuit model, it was possible to determine the BGW parameters. It was found that the coupling coefficient of BGW is very sensitive to aluminum layer thickness variations. Good agreement was found between calculated and measured parameters of BGW from an extrapolation to the zero layer thickness.<>
Keywords :
frequency response; interdigital transducers; lithium compounds; nonlinear acoustics; piezoelectric materials; surface acoustic wave delay lines; surface acoustic waves; Al; Al layer thickness variations; BGW parameters; Bleustein-Gulyaev waves; Li/sub 2/B/sub 4/O/sub 7/; Li/sub 2/B/sub 4/O/sub 7/ crystal; SAW equivalent circuit model; coupling coefficient; delay line; double electrode interdigital transducers; frequency response; third harmonic; zero layer thickness; Aluminum; Coupling circuits; Delay lines; Electrodes; Equivalent circuits; Extrapolation; Frequency response; Surface acoustic waves; Thickness measurement; Transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
