a method for mounting a piezoelectric transducer layer to a diaphragm layer exposes an electrode for each piezoelectric transducer after thermoset polymer filling the interstitial space between the piezoelectric transducers has been cured . the method includes bonding a polymer layer to a diaphragm layer having a plurality of openings , bonding piezoelectric transducers to the diaphragm layer , filling areas between the piezoelectric transducers on the diaphragm layer with thermoset polymer , and removing the thermoset polymer from the piezoelectric transducers with a laser to expose a metal electrode on each piezoelectric transducer .