Title :
Numerical and experimental investigation SAW in langasite
Author :
Yakovkin, I.B. ; Taziev, R.M. ; Kozlov, A.S.
Author_Institution :
Inst. of Semicond. Phys., Acad. of Sci., Novosibirsk, Russia
Abstract :
The present paper contains the complete numerical investigation of surface acoustics waves in langasite. The results are comprehensive contour-map and three-dimensional loci for velocity (Vo,Vm), beam steering (θ1), electromechanical coupling factor (K 2), first and second temperature derivatives of delay times (TCD1, TCD2). Optimal cuts for multimode resonators (TCD1=0), for bandpass filter (K2=0.54%) and for sensors (TCD1=32.82 ppm/°C) are determined. The rotated Z+25° cut has large K2 =0.26% and TCD1=0 at the room temperature. The surface transverse wave that propagates over this cut in X+90° exists only at the metalized surface
Keywords :
acoustic materials; band-pass filters; delays; surface acoustic wave filters; surface acoustic wave resonators; surface acoustic wave sensors; surface acoustic waves; ultrasonic velocity; SAW velocity; bandpass filter; beam steering; contour-map; delay times; electromechanical coupling factor; langasite; multimode resonators; sensors; surface acoustics waves; surface transverse wave; three-dimensional loci; Band pass filters; Beam steering; Crystals; Numerical models; Optical coupling; Physics; Propagation delay; Surface acoustic waves; Surface waves; Temperature sensors;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495604
