Full electrical characterization of aperiodic acoustic gratings byan enhanced Δ-function model: theory and experiment

摘要

We derive the admittance of an aperiodic one-dimensional acousticngrating with acoustically matched boundaries using an enhancednΔ-function model combined with the Green's function approach. Thenexpression obtained is compared with the classical Δ-functionnmodel and with electric back reflection measurements on a linearlynchirped bulk acoustic grating with matched boundaries formed in LiNbOn3 by domain inversion and excited in "crossed-field" scheme.nThe agreement between calculated and measured results is excellent