Polymer microring resonators for high sensitivity, broadband, wide-directivity ultrasound detection and high-resolution imaging

Sung-Liang Chen; Tao Ling; L. Jay Guo

doi:10.1117/12.916162

6 February 2012 Polymer microring resonators for high sensitivity, broadband, wide-directivity ultrasound detection and high-resolution imaging

Sung-Liang Chen, Tao Ling, L. Jay Guo

Author Affiliations +

Proceedings Volume 8236, Laser Resonators, Microresonators, and Beam Control XIV; 82361D (2012) https://doi.org/10.1117/12.916162
Event: SPIE LASE, 2012, San Francisco, California, United States

Abstract

Optical detection of ultrasound is an emerging technique based on the interaction of strain field and optical field, modulating the optical properties of the resonance cavity for sensitive detection. Such a detection scheme can have several unique advantages, such as broadband response and size-independent sensitivity, compared with conventional piezoelectric transducers. Detector's high sensitivity is essential for deep penetration depth, especially for highresolution imaging because of the strong attenuation of high-frequency ultrasound. Besides, small element size has the advantage of realizing wide acceptance angle of ultrasound detection. Previously we have demonstrated optical-based ultrasound detectors using polymer microring resonators, showing flat spectral response from dc to high frequency, over 90 MHz at -3-dB. By improving the fabrication process, we are able to achieve a new generation device with higher sensitivity and smaller element size. An ultralow noise-equivalent pressure of 21.4 Pa over 1-75 MHz range has been achieved using a fabricated detector of 60 μm diameter. We will mainly demonstrate its applications to photoacoustic imaging, including photoacoustic computed tomography and photoacoustic microscopy. The new generation device can also be applied to other ultrasound-related imaging and detection.

Citation Download Citation

Sung-Liang Chen, Tao Ling, and L. Jay Guo "Polymer microring resonators for high sensitivity, broadband, wide-directivity ultrasound detection and high-resolution imaging", Proc. SPIE 8236, Laser Resonators, Microresonators, and Beam Control XIV, 82361D (6 February 2012); https://doi.org/10.1117/12.916162

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