Acoustic waves in the BAW device are coupled into the system by exciting the piezo with a high-frequency amplified (High Wave 3.2, Digitum Elektronik) AC signal from a wave generator (AFG-2225, GW INSTEK). The impedance of the piezo varies with its excitation frequency. Since the voltage at the piezo is dependent on its impedance, it is verified using an oscilloscope (UTD2025CL, Uni-Trend Technology). Flows inside the microfluidic channels are controlled by pressure pumps and flow sensors (Flow EZ, Fluigent). We studied the movement of green fluorescent polystyrene (PS) particles (5.19±0.14µm diameter, microParticles GmbH) with a standard microscope (Axioscope, Zeiss). We used a high-speed camera (HiSpec 1, Fastec) to visualize the fast particle motions. Depending on the input power, we used frame rates between 20 -200 fps.