Micro fluidic channel actuator using optical force induced by evanescent field material coupling

Honggu Choi; Woosung Ha; Minkyu Park; Kyunghwan Oh

doi:10.1117/12.886038

17 May 2011 Micro fluidic channel actuator using optical force induced by evanescent field material coupling

Honggu Choi, Woosung Ha, Minkyu Park, Kyunghwan Oh

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 775359 (2011) https://doi.org/10.1117/12.886038
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

A hollow optical fiber (HOF) has an unique modal distribution of a central evanescent field due to its structure. The HOF consists of a central air hole, a Ge-doped ring core placed at the inmost layer, and silica cladding, which induces the weak evanescent field at the central hole. By the structure with geometric symmetry, it is possible to inject a refractive fluid into the hole and to modify the modal distribution. When a refractive index of the fluid is same with or higher than the core's, guiding of light becomes dominant at the center and the ringshaped field turns into a LP01 mode. During the process, optical force is induced and the net momentum of the fluid is changed. The direction of optical force is opposite to that of light propagation, and the fluid come to be dragged along the central channel in the HOF. In order to further investigate the phenomenon, we have changed the refractive index of the fluid and measured resultant optical force. The direction and strength of the optical force was dependent on the refractive index of the central fluid, which shows ample potential of the HOF as a refractive index sensor.

Citation Download Citation

Honggu Choi, Woosung Ha, Minkyu Park, and Kyunghwan Oh "Micro fluidic channel actuator using optical force induced by evanescent field material coupling", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775359 (17 May 2011); https://doi.org/10.1117/12.886038

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KEYWORDS

Geometrical optics

Refractive index

Liquids

Microfluidics

Channel projecting optics

Waveguides

Optical fibers

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