Mr. Jong-Min Lim Profile

Jong-Min Lim

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Proceedings Article | 9 September 2008 Paper

Fluorescent liquid-core/air-cladding waveguides toward integrated optofluidic light sources

Jong-Min Lim, Se-Heon Kim, Jae-Hoon Choi, Seung-Man Yang

Proceedings Volume 7039, 703914 (2008) https://doi.org/10.1117/12.794371

KEYWORDS: Waveguides, Light sources, Cladding, Microfluidics, Liquids, Molecules, Refractive index, Wave propagation, Rhodamine, Sodium

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The waveguides and light sources are essential building blocks in optofluidics. Here, we have developed the new approach to fabricate efficient waveguides and light sources by using two-phase stratified flow of dye containing liquid and air. The liquid-core/air-cladding (LA) waveguide can overcome some of major drawbacks of the liquid-core/liquid-cladding (L²) waveguide without losing its unique advantages. Specifically, stronger optical confinement, originated from the large refractive index contrast between core and cladding, enable us to achieve lower propagation losses and larger captured fractions (the amount of light to be coupled into the liquid core). In addition, the LA waveguides are free from diffusional mixing of the core and cladding fluids. The fluorescent LA waveguides can be fabricated by conventional poly(dimethylsiloxane) (PDMS) based soft lithography, which is compatible with the other parts of optofluidic devices. Therefore, the fluorescent LA waveguide can be easily integrated with precise alignment as an internal light source of optofluidic devices.

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