Elasticité des couches intervenant dans les verres correcteurs commercialisés par ESSILOR

Axe 4 - Dimensionnalité et confinement

Post-doctorat de Frédéric Faese

Projet de recherche mené du 01/10/2016 au 30/09/2017.
Post-doctorat financé par l'Appel à Projet industriel de 2016, cofinancée avec Essilor.

Laboratoires co-porteurs

• Institut des NanoSciences de Paris (INSP)
  Porteur de projet : Laurent Belliard
• ESSILOR - Pole comportement des matériaux R&D Physico-Chimie
  Co-encadrant : Sébastien Chatel

Mots clés  

Elasticité de couches minces - Mesures pompe sonde - Verres ophtalmiques

Résumé du projet

Two complementary techniques, picosecond ultrasonics (PU) and Brillouin light scattering (BLS), have been performed to measure the mechanical properties of layers involved in an optical stack. One of the advantages of these two techniques is their ability to analyze samples whose thickness varies from a few tens of nanometers (the anti-reflective coating) to several millimeters (the polymer substrate). Since all the layers constituting the optical stack have proved to be isotropic, they are completely elastically characterized thanks to the two techniques. Moreover, as the two independent elastic coefficients are measured by PU and BLS, c33 and c44 respectively, the complete stiffness matrix and, hence, the Poisson’s ratio and the Young’s modulus can be deduced.

Publications

• Frédéric Faëse, Delphine Poinot Cherroret, Sébastien Chatel, Loic Becerra, Fatiha Challali, Philippe Djemia, and Laurent Belliard
  Mechanical properties of elementary layers involved in a multilayer optical stack by photon-acoustic phonon interaction approaches
  Journal of Applied Physics 124, 125307 (2018)
  DOI : 10.1063/1.5030749

Conférences et interventions  

• Acoustics’ 17 BOSTON Juin 2017 - Présentation orale
  Study of the mechanical properties of thin films involved in ophthalmic glasses
  F. Faese, L. Belliard,  D. Poinot, S. Chatel, P. Djemia