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Séminaire NANO

Mardi 24 février à 9h30,
Salle Remy Lemaire, K223

Orateur : Antonio Fernandez-Dominguez (Departamento de Física Teórica de la Materia Condensada and IFIMAC Universidad Autónoma de Madrid)
"Plasmonic Confinement : Transformation Optics insight and Structured Illumination Imaging"

Abstract

The boost experienced by nano‐optics research during the last decade has been driven by the ability of surface plasmon polaritons to collect and concentrate light into subwavelength volumes with high efficiency. From a theoretical perspective, the exploration of this distinctive plasmonic attribute in smaller and smaller length scales has been possible thanks to the remarkable accuracy and predictive value that classical electrodynamics has demonstrated down to the nanoscale.

In the first part of my talk, I will introduce a Transformation Optics approach that allows for the quasianalytical description of the optical properties of paradigmatic plasmonic geometries, such as nanosphere dimers or nanocrescents [1]. I will show how this technique can be pushed below the nanometer by introducing nonlocal (spatially dispersive) metal permittivities accounting for the emergence of non‐negligible interactions among conduction electrons [2].

In the second part of my talk, I will describe how the confined and spatially structured nature of plasmonic fields can be exploited to achieve far‐field optical resolution beyond the diffraction limit of classical optics. Specifically, I will present an imaging scheme based on coherent scattering under a composite photonic−plasmonic structured illumination that yields four‐fold super‐resolution on nonfluorescent samples [3].

[1] J. B. Pendry et al., Nat. Physics 9, 518 (2013).
[2] A. I. Fernández‐Domínguez et al., Phys. Rev. Lett. 108, (2012).
[3] A. I. Fernández‐Domínguez et al., ACS Photonics, ASAP (2015).

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