Dr. Chao Zhao Profile

Dr. Chao Zhao

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Proceedings Article | 16 October 2023 Paper

Miniature optical fiber Fabry-Pérot ultrasonic transducer for ultrasound detection

Pengcheng Zhao, Chao Zhao, Wei Song, Chonglei Zhang

Proceedings Volume 12792, 1279208 (2023) https://doi.org/10.1117/12.2688049

KEYWORDS: Ultrasonics, Ultrasound transducers, Waveguides, Optical fibers, Optical resonators, Endoscopy, Signal detection, Photoacoustic spectroscopy, Photoacoustic imaging, 3D printing

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Piezoelectric ultrasonic transducers are difficult to meet the requirements of high sensitivity and small size for photoacoustic endoscopy imaging. Fabry-Pérot (F-P) resonator ultrasound sensors based optical fiber are not only small in size and high in sensitivity but also easy to integrate with photoacoustic endoscopy imaging systems. However, the typical F-P resonator lacks lateral confinement of the beam and is very sensitive to misalignment, resulting in a significant reduction in the quality factor (Q-factor). We propose a waveguide plane-concave F-P resonator, where the concave structure can provide lateral confinement and solve unaligned, and the waveguide can provide lateral confinement and relax curvature matching between the concave surface and the wavefront. Suitable waveguide length and concave curvature can yield high quality factors (> 10⁴) and Noise Equivalent Power (NEP) low as 29.4 𝑚𝑃𝑎√𝐻𝑧. The structure is directly fabricated on the fiber end face by two-photon polymerization 3D printing technology, the processing accuracy can low as 200 nm. It can accurately and quickly realize complicated 3D structure. And different materials with different characteristics can meet different ultrasonic detection bandwidth and sensitivity.

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