Fig. 5
From: Highly sensitive ultrasound detection using nanofabricated polymer micro-ring resonators
(Reproduced with permission from [33])
The polymer MRR ultrasound detector for a PA endoscopic probe. a A schematic illustration of the PA endoscopic probe. b Axial LSF profile. c Tangential LSF profile. d CNR calculated by the shift and sum method. Radial resolution is estimated at 6 dB (dashed line). e Photograph of the black plastic tube phantom. f 3D volumetric rendering of PA image of its inner surface. Axial cross-section within the region marked by the dashed box is shown in the right panel. Scale bar: 500 μm. g A-line signal from position marked by the red line in panel (f). h Photograph of the hair phantom sample. i 3D volumetric rendering of PA image of the hair phantom sample. The flattened cross-sectional view within dashed region is shown in the lower panel. j A-line signal from the position marked by the red line in panel (i). Scale bar 500 μm