Figure 3
From: Simultaneous acoustic and photoacoustic microfluidic flow cytometry for label-free analysis
(a) A representative RF line detected and recorded by the ultrasound (US) transducer from a 3 μm diameter black polystyrene particle. The ultrasound and photoacoustic (PA) signals in the RF line are highlighted in the red boxes. Transducer artifacts are removed from the signal, by subtracting background signals, to emphasize the detected ultrasound backscatter and photoacoustic waves. This background subtraction is common in acoustic microscopy28. Measured ultrasound backscatter (c) and photoacoustic (b) signals from the individual particle. These signals are gated using hamming window from the RF line.
