Journal
APPLIED PHYSICS LETTERS
Volume 85, Issue 22, Pages 5418-5420Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1829775
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Application of polymer waveguide microring resonators for high-frequency ultrasound detection is presented. The device consists of a microring optical resonator coupled to a straight optical waveguide which serves as input and output ports. Acoustic waves irradiating the ring waveguide induce strain modifying the waveguide cross section. As a consequence, the effective refractive index of optical waves propagating along the ring is modified. The sharp wavelength dependence of the high Q-factor resonator enhances the optical response to acoustic strain. High sensitivity is demonstrated experimentally in detecting broadband ultrasound pulses from a 10 MHz transducer. Methods of extending the technique to form multi-element ultrasonic arrays for imaging applications are proposed. (C) 2004 American Institute of Physics.
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