Title :
Full electrical characterization of aperiodic acoustic gratings by an enhanced /spl delta/-function model: theory and experiment
Author :
Gnewuch, Harald ; Zayer, Nadhum K. ; Pannell, Christopher N.
Author_Institution :
Sch. of Phys. Sci., Kent Univ., Canterbury, UK
Abstract :
We derive the admittance of an aperiodic one-dimensional acoustic grating with acoustically matched boundaries using an enhanced /spl delta/-function model combined with the Green\´s function approach. The expression obtained is compared with the classical /spl delta/-function model and with electric back reflection measurements on a linearly chirped bulk acoustic grating with matched boundaries formed in LiNbO/sub 3/ by domain inversion and excited in "crossed-field" scheme. The agreement between calculated and measured results is excellent.
Keywords :
Green´s function methods; acoustoelectric devices; bulk acoustic wave devices; chirp modulation; electric admittance; electric domains; ferroelectric devices; lithium compounds; /spl delta/-function model; Green function; LiNbO/sub 3/; LiNbO/sub 3/ ferroelectric crystal; acoustically matched boundaries; aperiodic one-dimensional acoustic grating; crossed-field excitation; domain inversion; electric back reflection; electrical admittance; linearly chirped bulk acoustic grating; Acoustic measurements; Acoustic reflection; Acoustic waves; Chirp; Electrodes; Ferroelectric materials; Gratings; Optical filters; Optical reflection; Polarization;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
