Figure 4
From: Ferroelectric thin film acoustic devices with electrical multiband switching ability
Examples of determining \({\rm{\Delta }}{\eta }_{j}^{(i)}\) for (a) first and (b) third acoustic eigenmodes, as well as (c) second and fourth eigenmodes in a four-layer BAW resonator structure. (reproduced from A. Mikhaylov et al., Technical Physics Letters, 42, 8 (2016), with the permission of TPL).
