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Séminaire NANO

Jeudi 11 Juin à 9H30,
Salle Rémy Lemaire, K223

Orateur : Aurélien Trichet (Oxford, UK)
"Optical trapping and sensing at the single nanoparticle level with open-access microcavities"

Abstract :

Open-access optical microcavities are emerging as an original tool for on-chip optofluidic sensing applications. This system is made up of two independent micron-scaled mirrors facing each other in a plano-concave geometry. They offer intrinsic tunability and direct access to the maximum of the electric field. Analyte solution can therefore be freely flown and finely analyzed between the two micromirrors. The first part of this talk will begin with an in-depth description of these open-access microcavities. Then, we will move on to the optical trapping of polysterene nanoparticles (diameter 150nm) within a cavity mode. As a unique feature, we will see that, by monitoring the mode spectral properties, one can infer the polarizability and the diffusion coefficient of each single nanoparticle. This system provides an interesting platform for biology and chemistry, since, in principle, we will be able to perform similar experiments on viruses such as the Influenza

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