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Microresonateurs optiques à etat liquide et microfluidique digitale : applications aux lasers à colorant en gouttes pour les laboratoires-sur-puce

Abstract : The purpose of this work is to study and realize liquid state optical resonators in digital microfluidics. Spherical droplets may behave as whispering gallery mode resonators, in which light is trapped by total internal reflections. At the microscopic scale, they exhibit outstanding optical properties. Their high quality factors make them attractive for studying non-linear optical phenomena, such as lasing, and for spectroscopy. In another field of research, digital microfluidics, that deals with multiphase fluid systems in artificial microchannels, also involves microdroplets. It offers a high degree of freedom in handling microdroplets: kHz generation, transport, encapsulation, fusion, division, stockpiling, sorting… Therefore, in lab-on-chip systems, turning microdroplets into resonant microcavities constitutes an opportunity for integrating optical analysis tools that can probe picoliter to nanoliter samples.After a review of the optical properties of whispering gallery mode resonators, this thesis reports the experimental results. A presentation of the methods of microfabrication and of the experimental bench top precedes the study of the dynamic generation of liquid optical microcavities. Then, these resonant cavities are applied to microfluidic laser sources. In particular, lasing effect has been demonstrated in spherical microdroplets of ethylene glycol and rhodamine 6G. Finally, an opening towards systems that combine microdroplets and Fabry-Perot cavities presents other perspectives such as the analysis of passive droplets in laser intacavity or the capability of fast switching the output wavelength of single mode microfluidic dye lasers.
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Submitted on : Tuesday, January 31, 2012 - 11:55:29 AM
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Guillaume Aubry. Microresonateurs optiques à etat liquide et microfluidique digitale : applications aux lasers à colorant en gouttes pour les laboratoires-sur-puce. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2011. Français. ⟨NNT : 2011PA112037⟩. ⟨tel-00664670⟩

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