Fig. 1.
(A) Oblique and cross-sectional views of the acoustic stack, with dotted line indicating cross-sectional cut through Tx element (B) and dashed line indicating cross-section cut through Rx element (C). HF ML = high frequency matching layer, LF ML = low frequency matching layer, FSIL = frequency-selective isolation layer, Au = sputtered Ti/Au conductive layer. Further details on materials are provided in Table I.