2.6. Other Components and Transducer Assembly The transducer is composed of a 36 ∘ Y-cut lithium niobate piezoelectric crystal with a diameter of 12 mm (such that a resonant frequency is centered at around 3 MHz) and two 100 nm electrodes of platinum with a 20 nm titanium adhesion layer, which was deposited onto the piezoelectric element by physical vapor deposition; a mineral insulated wire composed of two conductors of nickel (Omega) is used to drive the transducer.
