L’équipe Biof3 du département PHOTONIQUE organise un séminaire, le Lundi 29 Juin 2015 à 14h dans la salle de conférences à XLIM, donné par Charles-Henri Hage, actuellement chercheur post-doctorant au sein de l’équipe Dynamique non linéaire des systèmes optiques et biologiques - Groupe Biophotonique Cellulaire Fonctionnelle du laboratoire de Physique des LASERs, Atomes et Molécules (PhLAM) de l’Université de Lille 1. Son exposé s’intitulera "From building blocks to the complete house: around multimodal and Stimulated Raman imagings".

Note pour les doctorants : pensez à vous inscrire sur la liste d’appel lors du séminaire afin de faire valider votre participation auprès de l’école doctorale ED521 ! De plus amples informations sont disponibles sur le site de l’école doctorale (http://s2i.ed.univ-poitiers.fr/)

Abstract: When a high electric field provided by an ultrashort optical pulse is focalized into a medium, it can make its optical properties change, leading to the generation of nonlinear optical effects. Among them, second harmonic generation (SHG), two-photon excited fluorescence emission (TPEF), or stimulated Raman scattering (CARS, SRS), are the most employed ones to generate contrasts for microscopy in an increasing number of applications. Since the conditions for their generation are usually fulfilled by different biological organelles, detecting these different signals allows a multi-viewpoint observation of a sample called multimodal imaging, done without any exogenous fluorophores. Especially, stimulated Raman scattering requires at least two optical frequencies whose difference corresponds to an intra-molecular bond vibration frequency of interest. Numerous nonlinear fiber optics and instrumentation developments have been conducted these last 15 years to get suitable and user-friendly systems which can serve as a basis to multimodal systems. Taking these requirements into account, the central part of this talk will follow the path of light through an imaging system and deal with nonlinear fiber optics thoughts and developments to generate a suitable light source for multimodal imaging.

Contact du séminaire : frederic.louradour@xlim.fr / seminaires@xlim.fr