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 μm polyester microsphere and shows wide-angle sensitivity. A1-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.
|Original language||English (US)|
|Number of pages||7|
|Journal||IEEE Journal on Selected Topics in Quantum Electronics|
|State||Published - Jan 2008|
Bibliographical noteFunding Information:
Manuscript received September 6, 2007; revised November 20, 2007. This work was supported by the NIH under Grant EB004933-01 and Grant EB007619-01A1.
- Acoustic detectors
- Acoustic devices
- Optical resonance
- Optical resonators
- Optical strip waveguides
- Optical waveguide components
- Optical waveguides
- Ultrasound detector