Isaël HERRERA will defend his PhD thesis entitled “From 2D polarized fields to 3D Stokes polarimetric imaging at nanoscales” on the 19th of December at 10:00 a.m. in Pierre Cotton’s room. The presentation and slides will be in English.
List of the jury members :
– Rafael PIESTUN, Professor. University of Colorado Boulder
– Gabriel MOLINA, Research professor. Centro de Física de Materiales
– Étienne BRASSELET, Directeur de Recherche. Laboratoire Ondes et Matière d’Aquitaine
– Samira KADHIR, Maître de conférences. Université Côte d’Azur
– Sophie BRASSELET, Directrice de recherche. Institut Fresnel
– Miguel A. ALONSO, Professeur d’Université. Institut Fresnel
Abstract : In this work, we study aspects of light polarization, from macroscopic to nanoscopic scales. We propose and implement beams exhibiting all possible polarization ellipses in the paraxial regime. We explain how to generate and measure such skyrmionic polarization structures defined from conformalmappings proposed in the context of cartography. Also, we generate and measure propagation invariantMeron lattices. While measuring the polarization of light atmacroscopic scales can be done simply with cameras and common optical elements such as polarizers and wave plates, measuring it at nanoscopic scales, where the field can oscillate in 3D, is not straightforward. This has been a field of study in the last decades. In this work, we propose theoretical, numerical and experimental tools to explore 3D polarization states at nanoscales in imaging configuration. The foundations of this work are the so-called Generalized Stokes-Gell-Mann parameters, a set of nine parameters that completely describe the geometrical aspects of the electric fields oscillations. We have extended the range of applications of those parameters to the description of dipole sources and their measurement with optical microscopes. Another area of research that has been developed in recent years is the measurement
of individual 3D-oriented fluorophores. Since the development of super-resolution microscopy techniques, there has been an interest in measuring not only the 3D position of single molecules but also their 3D orientation. In this work, we benefit from the dipolar nature of single fluorophores and extend the range of applications of the Stokes-Gell-Mann parameters to the study of 3D-oriented molecules.
of individual 3D-oriented fluorophores. Since the development of super-resolution microscopy techniques, there has been an interest in measuring not only the 3D position of single molecules but also their 3D orientation. In this work, we benefit from the dipolar nature of single fluorophores and extend the range of applications of the Stokes-Gell-Mann parameters to the study of 3D-oriented molecules.
Keywords : Polarization, Microscopy, Imaging, Nanoparticles, Molecules
