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Theses

Localisations et exaltations de la lumière dans des structures métalliques sub-longueur d'onde

Abstract : This thesis presents theoretical works based on a modal approach, about the optical properties of metallic surfaces with rectangular grooves whose dimensions are smaller than the wavelength of the incident light. These surfaces show reflection anomalies related to local enhancements of the electromagnetic field, due to, in particular, Fabry-Pérot like resonances inside the grooves.
The problem of two near-field coupled sub-wavelength cavities is analysed. Hot spot phenomena occur, and we show how to control the localization of light at sub-wavelength scales. The results could find important applications: optical switching, quantitative light addressing, surface enhanced Raman scattering (SERS)... We also study the localization effects due to structural disorder: breaking the symmetry of periodic arrangements, different lighting configurations may appear, very sensitive to the excitation frequency. Some theoretical predictions are evidenced experimentally.
Finally, we deal with the case of very sub-wavelength lamellar gratings, in connection with the Abnormal Optical Absorption and the SERS effect observed for some rough metallic films. Giant enhancements of the electric field, calculated inside nano-cavities with the exact modal method, in the visible region, are explained by the excitation of surface plasmons-polaritons whose wave vectors are much larger than those of light.
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https://tel.archives-ouvertes.fr/tel-00149401
Contributor : Jérôme Le Perchec <>
Submitted on : Friday, May 25, 2007 - 2:47:16 PM
Last modification on : Thursday, November 19, 2020 - 1:00:55 PM
Long-term archiving on: : Thursday, April 8, 2010 - 5:55:56 PM

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  • HAL Id : tel-00149401, version 1

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Jérôme Le Perchec. Localisations et exaltations de la lumière dans des structures métalliques sub-longueur d'onde. Physique [physics]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00149401⟩

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