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.
|Original language||English (US)|
|Number of pages||6|
|Journal||Progress in Biomedical Optics and Imaging - Proceedings of SPIE|
|State||Published - Aug 16 2005|
|Event||Sixth Conference on Biomedical Thermosacoustics, Optoacoustics, and Acousto-Optics - Photons Plus Ultrasound: Imaging and Sensing 2005 - San Jose, CA, United States|
Duration: Jan 23 2005 → Jan 25 2005