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Amplification of Light-Ultrasound Interaction in a Pi-Shifted Fiber Bragg Grating for Enhanced Ultrasonic Sensitivity
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DOI：10.1002/lpor.202501030.png)
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Abstract
En 中文
Optical resonators offer a promising alternative to conventional piezoelectric transducers in ultrasound detection because they can be miniaturized without a decrease in sensitivity. However, optical-resonator-based detectors still possess a significant sensitivity disadvantage compared to millimeter-scale piezoelectric transducers, preventing the dissemination of these micro-detectors. In this manuscript, we present a new detector design that bridges the sensitivity gap between optical-resonator-based detectors and piezoelectric transducers by amplifying light-ultrasound interaction in a pi-shifted Fiber Bragg grating. The proposed detector has a noise equivalent pressure density <0.5 mPa/√Hz, an ultra-broad bandwidth of more than 100 MHz. We perform a side-by-side comparison between our detector and state-of-the-art piezoelectric bulky transducers employed in pre-clinical optoacoustic systems, revealing comparable performance of the devices. These demonstrations with the detector length of approximately 500 µm and a diameter of only 125 µm pave the way for miniaturized and high-performance implementations of our detector in a wide range of minimally invasive applications, especially intravascular and endoscopic.
Keywords:
high Q-factor
optical resonator
optoacoustic
photoacoustic
ultrasound detector
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