KEYWORDS: Optoacoustics, Acoustics, In vivo imaging, Microrings, Silicon photonics, Point spread functions, Detection theory, Design and modelling, Vascular imaging, Ultrasonography
We demonstrate an ultra-wideband silicon-photonics acoustic detector (SPADE) with high sensitivity and signal fidelity, enabling highly detailed vascular imaging with resolutions comparable to optoacoustic microscopy. Our design is based on a planarized micro-ring resonator coated with an elastomer cladding in which the sensing is performed. The design of the guided optical mode and the use of planarization lead to high signal fidelity and a tomographic point-spread function that is in excellent agreement with the theoretical prediction. The new SPADE platform is demonstrated in vivo for imaging the vasculature of a mouse ear in high definition.
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