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- Titel:
Amplification of Light-Ultrasound Interaction in a Pi-Shifted Fiber Bragg Grating for Enhanced Ultrasonic Sensitivity
- Dokumenttyp:
- Article; Early Access
- Autor(en):
- La, Tai-Anh; Shnaiderman, Rami; Ntziachristos, Vasilis
- Abstract:
- 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/root 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
m and a diameter of only 125 mu m pave the way for miniaturized and high-performance implementations of our detector in a wide range of minimally invasive applications, especially intravascular and endoscopic. - Zeitschriftentitel:
- Laser Photon Rev
- Jahr:
- 2025
- Volltext / DOI:
- doi:10.1002/lpor.202501030
- Print-ISSN:
- 1863-8880
- TUM Einrichtung:
- Lehrstuhl für Biologische Bildgebung - Zusammenarbeit mit dem Helmholtz-Zentrum München (Prof. Ntziachristos)
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