Dr. Chao Zhao Profile

Dr. Chao Zhao

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Proceedings Article | 3 September 2024 Paper

High-order phase-shifted Bragg grating waveguide sensor for ultrasound detection

Peijian Li, Chao Zhao, Chonglei Zhang

Proceedings Volume 13227, 1322705 (2024) https://doi.org/10.1117/12.3035070

KEYWORDS: Waveguides, Signal detection, Bragg gratings, Ultrasonography, Sensors, Ultrasound transducers, Optical gratings, Ultrasonics, Endoscopy, Two photon polymerization

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Photoacoustic endoscopy (PE) is an emerging medical imaging technology that combines optical and acoustic imaging modalities, enabling high-resolution imaging of tissues inside the body. Compared to traditional piezoelectric sensors, optical sensors offer advantages in sensitivity, bandwidth, and size, making them suitable for PE applications. This paper demonstrates a high-order phase-shifted Bragg grating waveguide (HP-BGW) fabricated by two-photon polymerization 3D printing as an ultrasonic sensor. The grating is designed to achieve a high transmittance, and sharp line shape in resonant transmission so that enhancing the sensor's sensitivity. The proposed sensor is easy to manufacture and features a wide bandwidth and small size, making it suitable for photoacoustic endoscopy applications. The sensor was characterized using a spectrometer and ultrasound transducers, achieving a Q-factor of approximately 1×10^4 with a bandwidth of around 25MHz and a dynamic range of at least 29MHz.

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