Fig. 1. Imaging probe for photoacoustic microscopy. (a) Schematic of imaging probe;(b) cross-section of ultrasound transducer with integrated amplifier

Fig. 2. Experimental setup for photoacoustic microscopy

Fig. 3. Sensitivity and spatial resolution of photoacoustic(PA) microscopy. (a) PA signal detected by ultrasound transducer without integrated amplifier; (b) PA signal detected by ultrasound transducer with integrated amplifier; (c) B-scan image of a tungsten wire; (d) profile along lateral dashed line on Fig.3(c); (e) profile along axial dashed line on Fig.3(c)

Fig. 4. 3D PA imaging of phantoms. (a) Photo of printed letters and PA imaging result; (b) maximum amplitude projection (MAP) image of tungsten wires; (c) 3D rendered image of tungsten wires

Fig. 5. 3D PA imaging of mouse ear. (a) Maximum amplitude projection (MAP) image of mouse ear; (b) B-scan image; (c) close-up of region labeled 1 in Fig.5(a); (d) close-up of region labeled 2 in Fig.5(a)