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Theses

Guidage optique dans les cristaux plasmoniques 1D et 2D

Abstract : This thesis is devoted to the study of waveguiding properties of surface plasmons polaritons (group velocity, radiative coupling, absorption) on 1D and 2D plasmonic crystals composed of a metallic film periodically drilled with nanoscaled apertures (slits or holes). We have developed a setup for the measurements of optical transmission and reflexion on large spectral (1-16 μm) and angular (0−60°) ranges. It allows to obtain dispersion diagramms with a high resolution (±0.3°, 0.5 cm−1).

In 1D plasmonic crystals, we evidence modulations of radiative losses, due to the coupling between surface plasmons propagating along air/metal and substrate/metal interfaces. It induces two propagation regimes : a radiative regime with negligible absorption, and a low-loss regime nearly uncoupled to the free space. Moreover we show that we can continuously tune the propagation regime with a slight modification of the optical index of the substrate (1%). It opens up new perspectives for the external control of radiative/non-radiative coupling of guiding modes.

We also present the dispersion properties of surface plasmons on 2D anisotropic plasmonic crystals with different periods along the two symmetry axes. We reveal a band gap far from the borders of the first Brillouin zone. It is induced by the coupling of three surface plasmons propagating in nearly orthogonal directions. One of these coupled modes presents a strong radiative coupling and a weak group velocity.
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https://tel.archives-ouvertes.fr/tel-00239406
Contributor : Cyrille Billaudeau <>
Submitted on : Tuesday, February 5, 2008 - 4:38:57 PM
Last modification on : Thursday, January 11, 2018 - 6:14:35 AM
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Cyrille Billaudeau. Guidage optique dans les cristaux plasmoniques 1D et 2D. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00239406⟩

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