Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 14, Issue 1, Pages 191-197Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2007.914047
Keywords
acoustic detectors; acoustic devices; microresonators; optical resonance; optical resonators; optical strip waveguides; optical waveguides; optical waveguide components; ultrasound detector
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Funding
- NATIONAL INSTITUTE OF BIOMEDICAL IMAGING AND BIOENGINEERING [R01EB007619, R21EB004933] Funding Source: NIH RePORTER
- NIBIB NIH HHS [R01 EB007619, R01 EB007619-01A1, R21 EB004933] Funding Source: Medline
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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 mu m polyester microsphere and shows wide-angle sensitivity. A 1-D 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.
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