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Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers

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Published on: May 5, 2016

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

Jong-Min Lim¹, Se-Heon Kim, Jae-Hoon Choi

¹Department of Chemical and Biomolecular Engineering, KAIST, Daejeon, 305-701, Korea.

|September 27, 2008

Summary

We developed novel fluorescent liquid-core/air-cladding (LA) waveguides for optofluidic light sources. These waveguides offer enhanced light confinement and tunable core size, outperforming liquid-core/liquid-cladding designs.

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Area of Science:

Optofluidics
Integrated photonics
Materials science

Background:

Optofluidic devices require efficient light guiding structures.
Existing liquid-core/liquid-cladding waveguides have limitations in optical confinement.

Purpose of the Study:

To demonstrate novel fluorescent liquid-core/air-cladding (LA) waveguides.
To evaluate their performance as integrated optofluidic light sources.

Main Methods:

Fabrication of poly(dimethylsiloxane) (PDMS) channels using soft lithography.
Generation of two-phase stratified flows of air and fluorescent dye-infused ethylene glycol.
Characterization of optical confinement, propagation losses, and core stream tunability.

Main Results:

Achieved strong optical confinement due to high refractive index contrast in LA waveguides.
Experimentally determined captured fractions up to 22.8%.
Measured low propagation losses of 0.14 dB cm(-1) and demonstrated reversible core size tuning.

Conclusions:

LA waveguides are suitable for integrated optofluidic light sources.
They offer superior optical confinement and control compared to L(2) waveguides.
The absence of diffusional mixing and tunable core size present significant advantages.