Ultrasound detection using polymer microring optical resonator

Shai Ashkenazi, Chung Yen Chao, L. Jay Guo, Matthew O'Donnell

Research output: Contribution to journalArticlepeer-review

77 Scopus citations


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.

Original languageEnglish (US)
Article number3
Pages (from-to)5418-5420
Number of pages3
JournalApplied Physics Letters
Issue number22
StatePublished - Nov 29 2004


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