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Polymer microring resonators fabricated by nanoimprinting are presented as a means of ultrasound detection. Acoustic waves impinging on a ring-shaped optical resonator cause strain in the ring dimensions, modulating optical output. Basic acoustic and optical characteristics of the microring sensor are presented. Measurements at several frequencies show a high sensitivity and low noise-equivalent pressure. The angular response is determined by sensing the optoacoustic excitation of a 49 mum polyester microsphere and shows wide-angle sensitivity. A 1D array consisting of four microrings is demonstrated using wavelength multiplexing for addressing each element. The high sensitivity, bandwidth, and angular response make it a potentially useful sensor platform for many applications including high-frequency ultrasonic and photoacoustic imaging.
Published in:
Selected Topics in Quantum Electronics, IEEE Journal of
(Volume:14
,
Issue:
1
)
Date of Publication: Jan.-feb. 2008
- Page(s):
- 191 - 197
- ISSN :
- 1077-260X
- INSPEC Accession Number:
- 9794425
- Digital Object Identifier :
- 10.1109/JSTQE.2007.914047
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 12 February 2008
- Issue Date :
- Jan.-feb. 2008
- Sponsored by :
- IEEE Photonics Society
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