Fig. 10
From: Highly sensitive ultrasound detection using nanofabricated polymer micro-ring resonators
(Reproduced with permission from [35])
a A schematic illustration of 3D PACT system with the polymer MRR ultrasound detector. CW: continuous wave; AT: attenuator; OL: objective lens; PC: polarization controller; FC: fiber coupler; DAQ: data acquisition; APD: avalanche photodetector; US: ultrasound; SP: scanning plane. b The resonance spectrum and the Q-factor of the MRR with the PDMS cladding and the low refractive index polymer cladding. c Photograph of the perfused mouse brain with different image planes. d MAP PA images of the perfused brain. e Photograph of the mouse ear. f MAP PA images of the mouse ear. g Photograph of Xenopus Laevis tadpole. Inset is a close-up image of the skin pigments. h MAP PA images of the tadpole