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Geometrical optimization of organic microlasers for microfluidic chemical sensing

Lozenko, S; Faye, D; Zhang, HT; Lebental, M; Lautru, J; Zyss, J; Lefevre, JP; Leray, I APPLIED PHYSICS B-LASERS AND OPTICS 2014, 117, 501-506.

We report the design, fabrication, and demonstration of a chemical sensor-based on the spectral shift of organic microcavity lasers. The shape of the cavity contour is used as a parameter and is optimized to improve the sensitivity. Analytical and numerical predictions are in good agreement with experiments performed in a microfluidic environment, showing sensitivities of up to 100 nm per refractive index unit for stadium-shaped microlasers on pedestal. Selective sensing of Hg2+ at a concentration down to 200 ppb is then demonstrated with cavities functionalized by ligands that are known to bind mercuric cations.

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Publication

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Paru le 11 juin 2014

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DOI: 10.1007/s00340-014-5861-7