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Challenges and new concepts in the electromagnetic modeling of complex resonant nanostructures

Kevin Vynck

Jeudi 22 juin 2017

à 11h, en salle C. BROT

Controlling the interaction of light with nanoparticles is one of the spearheads of research in modern optics and photonics. Metallo-dielectric nanoparticles enable strong light scattering at frequencies that are tunable over the whole visible and near-infrared ranges, and to control the directivity of light scattering as a function of the angle and polarisation of the incident wave. When these nanoparticles are placed in thin-film stacks, their optical properties are further enriched thanks to the interaction of the nanoparticles with the stratified medium and to the mutual interaction between nanoparticles. Such nanostructured surfaces can be fabricated by bottom-up techniques (hence at low cost and on large scales) and could exhibit new, exotic optical properties, thereby impacting technologies as diverse as photovoltaic panels, organic light-emitting diodes, biosensors, or even transparent displays for augmented reality devices. Unfortunately, theoretically predicting the optical properties of such complex nanostructures has remained a seemingly insurmountable challenge up to now, due to the difficulty to consider simultaneously the coherent phenomena occurring down to the nano-scale – at the level of the individual nanoparticle – up to the mesoscopic scale – at the level of the nanoparticle ensemble.

In this seminar, I will present the methods that we are currently developing and employing to theoretically/numerically model the light scattering by complex nanostructures. In particular, we will present a formalism based on the concept of quasi-normal modes that allows analyzing individual nanoparticles with great physical insight and reduced computational cost, and propose a computational method enabling the modeling of disordered ensembles of complex nanoparticles strongly interacting with planar interfaces.