Le département XLIM/MINACOM (équipe Optoélectronique Plastique) reçoit la visite du Dr. François Lagugné-Labarthet, de l’University of Western Ontario (Canada), qui présentera un exposé intitulé « Plasmonics for high spatial resolution and high sensitivity vibrational spectroscopy », le Jeudi 7 Novembre à 14h en salle de conférences XLIM (site FST/La Borie).
Abstract : Due to the inherently weak Raman scattering cross section, the signals of diluted solutions and monolayer films are often difficult to measure, resulting in long acquisition times and poor signal to noise ratio. With Surface Enhanced Raman Spectroscopy (SERS), these analytes are combined with gold or silver nanostructured surfaces, increasing the Raman vibrational signal by several orders of magnitude, leading to short acquisition times. More importantly, using advanced nanofabrication techniques such as electron beam lithography, the properties of the plasmon wave can be tuned accurately and the metallic nanostructures can be fabricated with a high degree of reproducibility. Furthermore the platforms can also be integrated in more complex devices such as microfluidics channels. We present here examples of Raman imaging on different chemical systems adsorbed on plasmonic nanostructures. The extension of SERS to Tip Enhanced Raman spectroscopy (TERS) is also discussed with the main goal to improve spatial resolution and surface specificity. Examples of applications conducted in our group are given. Last we present ways to modify surfaces in order to grow biological materials in regular array with the goal to study biomolecular exchanges at the single cell level using confocal microscopy.
Biography of the author: Dr. Francois Lagugné-Labarthet is associate professor at The University of Western Ontario Canada since 2007. He got his PhD in 1998 at Université Bordeaux 1 and did his postdoc at Queens University in Canada until 1999. He later accepted a position as Chargé de Recherche CNRS at Université Bordeaux where he worked from 2000 to 2007 prior to coming in Canada. He is the author and co-author of about 70 manuscripts including two book chapters and has given over 50 invited seminars at national and international conference and universities.