TITLE

Ultrasound detection using polymer microring optical resonator

AUTHOR(S)
Ashkenazi, Shai; Chung-Yen Chao; Guo, L. Jay; O'Donnell, Matthew
PUB. DATE
November 2004
SOURCE
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5418
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
15244099

 

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