Title :
Second harmonic reflectors on 128°LiNbO3
Author :
Lehtonen, Saku ; Plessky, Victor P. ; Koskela, Julius ; Salomaa, M.M.
Author_Institution :
Mater. Phys. Lab., Helsinki Univ. of Technol., Finland
Abstract :
In this work, we study theoretically the operation of surface-acoustic wave (SAW) reflectors at the second harmonic frequency on the 128° LiNbO3 substrate for various electrode thicknesses and metallisation ratios. Rigorous FEM/BEM simulations utilizing a tailored test structure and time gating indicate that for certain geometries, the reflectivity of the 2nd harmonic reflectors can be very high. Furthermore, our simulations suggest that inside the stopband the total losses for the second harmonic are of the same order as those for fundamental harmonic operation
Keywords :
Rayleigh waves; boundary-elements methods; electrodes; finite element analysis; lithium compounds; losses; surface acoustic wave resonators; FEM/BEM simulations; LiNbO3; Rayleigh waves; SAW resonators; electrode thicknesses; metallisation ratios; reflectivity; second harmonic frequency; second harmonic reflectors; stopband; tailored test structure; time gating; total losses; Electrodes; Fingers; Frequency; Geometry; Gratings; Physics; Reflectivity; Surface acoustic waves; Testing; Transducers;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.991595
