Optical field enhancement: Basic concepts and applications Dr. Aude LEREU Institut Fresnel – UMR 7249 – Marseille - France Contact: Av. Escadrille Normandie Niemen, 13397 Marseille Cedex, France Tel: +33-4-8452-9205 Fax: +33-4-9128-8067 Email: [email protected] Curriculum Vitae Current status Researcher, 1st class, CNRS Co-authored 37 articles, 2 book chapters and 1 European patent Professional experiences ! 2013–Present: Research Staff, Institut Fresnel - UMR 7249, Marseille, 13397, France ! 2009–2012: Research Staff, CINaM – Centre Interdisciplinaire de Nanosciences de Marseille, 13288, Marseille, France ! 2008–2009: CNRS Research Engineer, Equipe Optique de Champ Proche - Institut Carnot de Bourgogne, Dijon, 21000, France ! Since 2008: Invited Researcher, Measurement Science and Systems Engineering Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee, USA ! 2007–2008: CNRS Research Associate, Institut Fresnel, Marseille, 13397, France ! 2006–2008: Invited Researcher, Nanoscale Science and Devices Group, Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee, USA ! 2005–2007: Research Associate, Molecular Nanophotonics Group, ICFO - Institut de Ciències Fotòniques, Castelldefels 08860 (Barcelona), Spain ! 2002–2005: Research Assistant, Nanoscale Science and Devices Group, Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee, USA Research interests Near field optics, Plasmonics and thermoplasmonics, Optical field enhancement in optimized multi-dielectric thin films stack Abstract We will start with an introduction on optical field enhancement and optical resonances. We will then review some applications involving field enhancement, followed by examples of researches/techniques that uses field enhancement. In this part, we will especially introduce near field scanning optical microscopy (NSOM) and show the field enhancement at the apex of such microscope and its uses. We will then discuss on the surface plasmon resonances sustained by a metal thin film in the Kretschmann configuration (i.e. under total internal reflection (TIR)), highlight surface plasmon excitation using NSOM and evidence the resulting field enhancement. Finally, we will study the possibility to obtain giant field enhancements, under TIR configuration, sustained by an optimized multi-dielectric thin films stack. We will show that such field enhancement is theoretically unbounded (in the linear limits) and is just limited by the illumination bandwidths. A conclusion will summarize on the cited examples and show the significance of investigating/understanding and controlling optical field enhancements. 1. A. L. Lereu, M. Zerrad, C. Ndiaye, F. Lemarchand and C. Amra, “Scattering losses in multi-dielectric structures designed for giant optical field enhancement”, Appl. Opt. 53, A412 (2014). 2. A. L. Lereu, R. H. Farahi, L. Tetard, S. Enoch, T. Thundat and A. Passian, “Plasmon assisted thermal modulation in nanoparticles”, Optics Express 21, 12145 (2013). 3. A. L. Lereu, A. Passian, and Ph. Dumas, “Near field optical microscopy: a brief review”, Int. J. Nanotechnol. 8 (10-12) (2012). .