25 April 2005 Integrated optics design concepts applied to high frequency ultrasound detection
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A novel application of polymer waveguide microring resonator for high-frequency ultrasound detection is presented. The device consists of a microring optical resonator that is coupled to a straight optical waveguide which serves as both input and output ports. Acoustic waves irradiating the ring waveguide induce strain that causes a change in the effective refractive index of optical waves propagating along the ring. The sharp wavelength dependence of the high Q-factor resonator enhances the optical response to the acoustic strain. High sensitivity has been demonstrated experimentally in the detection of broadband ultrasound pulses from a 10MHz transducer. WDM methods are proposed to extend the technique into an array of microrings for ultrasound imaging applications.
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Shai Ashkenazi, Shai Ashkenazi, Matthew O'Donnell, Matthew O'Donnell, L. Jay Guo, L. Jay Guo, Chung-Yen Chao, Chung-Yen Chao, } "Integrated optics design concepts applied to high frequency ultrasound detection", Proc. SPIE 5697, Photons Plus Ultrasound: Imaging and Sensing 2005: The Sixth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, (25 April 2005); doi: 10.1117/12.589309; https://doi.org/10.1117/12.589309

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