13 March 2014 Highly sensitive optical microresonator sensors for photoacoustic imaging
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We present novel concave Fabry Perot (FP) sensor arrays for photoacoustic imaging which were fabricated using a high-precision inkjet printing approach to produce the cavity and employed physical vapor deposition to form the dielectric mirrors. Our concave FP cavity design provides excellent beam confinement within the cavity enabling high finesse and thus high sensitivity to be achieved. Two such concave sensors are evaluated in terms of their sensitivity and acoustic bandwidth. A 66 μm thick concave sensor is shown to provide a noise equivalent pressure (NEP) of 85 Pa and an acoustic bandwidth of 16 MHz, and can potentially be used as a sensitive broadband sensor for superficial imaging. A 250 μm thick sensor with an NEP of 12 Pa and acoustic bandwidth of 4 MHz was also developed for deep tissue imaging applications.
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Jing Li, Jing Li, Alaric Taylor, Alaric Taylor, Ioannis Papakonstantinou, Ioannis Papakonstantinou, Edward Zhang, Edward Zhang, Paul Beard, Paul Beard, "Highly sensitive optical microresonator sensors for photoacoustic imaging", Proc. SPIE 8943, Photons Plus Ultrasound: Imaging and Sensing 2014, 89430C (13 March 2014); doi: 10.1117/12.2037015; https://doi.org/10.1117/12.2037015

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