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Proceedings Paper

Development of versatile waveguide-coupled optofluidic micro-ring resonator devices
Author(s): Ian M. White; Scott Lacey; John Gohring; Yuze Sun; Xudong Fan
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Paper Abstract

Optical ring resonators have been investigated for a number of interesting devices, including dye lasers and sensors. However, in general, these devices can only operate on liquid samples with a low refractive index (RI) because the whispering gallery modes (WGMs) are bound in the resonator through total internal reflection at the resonator/sample boundary. We recently introduced a new opto-fluidic ring resonator (OFRR) that uses a thin-walled capillary to deliver the sample through an array of ring resonators contained within the circular cross-section of the capillary. Thus, in the OFRR, the WGM is bound at the outer surface while the evanescent field interacts with the sample at the inner surface. Therefore, the OFRR can operate on samples of lower and higher RI than the capillary material. This unique feature, in combination with the OFRR's practical fluidic delivery design and its simplicity make it an attractive opto-fluidic device for sensors, lasers, and other applications. We analyze the OFRR's capability to support WGMs that are excited externally through fiber tapers and that interact with the sample inside. Using a quantum mechanical analogy, we show that for liquid cores with a higher RI than the capillary material, two coupled propagating waves exist that enable WGMs inside the liquid core to be excited by a fiber taper outside the OFRR, across a few microns. We experimentally verify our analysis by demonstrating refractometric sensors and dye lasers with core RIs lower and higher than the capillary.

Paper Details

Date Published: 12 February 2008
PDF: 7 pages
Proc. SPIE 6896, Integrated Optics: Devices, Materials, and Technologies XII, 68960P (12 February 2008); doi: 10.1117/12.761798
Show Author Affiliations
Ian M. White, Univ. of Missouri, Columbia (United States)
Scott Lacey, Franklin & Marshall College (United States)
John Gohring, Univ. of Missouri, Columbia (United States)
Yuze Sun, Univ. of Missouri, Columbia (United States)
Xudong Fan, Univ. of Missouri, Columbia (United States)

Published in SPIE Proceedings Vol. 6896:
Integrated Optics: Devices, Materials, and Technologies XII
Christoph M. Greiner; Christoph A. Waechter, Editor(s)

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