Seminar Announcement: Azzedine Boudrioua

Data pubblicazione: 06-set-2021

Announcement

Wednesday, 8 September 2021, 15:00

Sala Grande Palazzina B via alla Cascata 56/C

"The role of Rayleigh anomalies in the coupling process of plasmonic gratings and the control of the emission properties of organic molecules"

Prof. Azzedine Boudrioua

Université Paris 13, Sorbonne Paris Cité, Laboratoire de Physique des Lasers,

CNRS (UMR7538) 93430 Villetaneuse, France

E-mail: boudrioua@univ-paris13.fr

Abstract

After a short presentation of the group, we will report a study of the influence of periodic metallic arrays on the emission properties of organic emitters. Two different grating regimes have been demonstrated and used to control the spatial and spectral optical responses of organic molecules. Tuning the coupling between the nanoparticles allows to excite surface lattice resonances, hybrid modes sharing both plasmonic and photonic features. In this context, the grating responses have been deeply analyzed in order to reveal the origin of the excited modes. The obtained results emphasis the crucial role of the Rayleigh Anomalies, which can be considered as the intermediate between individual plasmonic and collective photonic responses. The obtained results indicate that tuning the geometrical grating parameters offers a possibility to select a particular coupling process from a localized effect to a far field response; and depending on the coupling strength, the emission can be strongly altered by increasing the density of states or providing diffractive orders. Moreover, the studies report that the Rayleigh Anomalies play the role of an excitation source which drives the nanoparticles to act as a set of diffractive objects for shaping the emission to be highly directive.