Fig. 2.

OR-PAM relying on optical ultrasound detection. (a) An angle view scanning electron microscope image of a microring with a diameter of 60 μm [12]. (b) The frequency response of the microring detector [12]. (c) Schematic of an AOPAM system based on the microring detector [35]. (d) Ex vivo images (maximum amplitude projection) of the vasculature in a mouse bladder wall acquired with the AOPAM in (c) [35]. (e) Experimental setup of a GLAD AOPAM system. The inset: an in vivo image of the capillary bed in the CAM membrane of 5-day chicken embryo model (Scale bar: 100 μm) [42]. Reprinted with permission from Refs. [12], [35], [42].