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12 February 2008 Development of versatile waveguide-coupled optofluidic micro-ring resonator devices
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ian M. White, Scott Lacey, John Gohring, Yuze Sun, and Xudong Fan "Development of versatile waveguide-coupled optofluidic micro-ring resonator devices", Proc. SPIE 6896, Integrated Optics: Devices, Materials, and Technologies XII, 68960P (12 February 2008); https://doi.org/10.1117/12.761798
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