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Interaction des ondes de surface avec des microstructures périodiques. Émission thermique cohérente et transmission résonante

Abstract : Polar materials or metals can support electromagnetic modes which are confined and propagate along the interface. Such surface waves can couple to a propagating one thanks to a grating ruled on the surface.
We use a Rigorous Coupled Wave Analysis (RCWA) algorithm to calculate the radiative properties of those periodic structures. Their sub-wavelength dimensions are optimized for two applications. On one hand, the coherent thermal emission, and on the other hand, the resonant transmission.
First, we show that a thermal source may produce partially spatially coherent light.
We report here an experimental and a numerical study of such sources. We find an
excellent agreement between numerical calculations and measurements. We derive quantitatively the coherence length of the field propagating along the source. We finally report
studies on new type of sources that produce isotropic emission of light.
In a second part, we focus on an other topic: the resonant transmission by periodically
corrugated metallic films. We show that transmission peaks can be attributed to
resonances of the structures. We see that those resonances result of a coupling between cavity modes and surface plasmon polaritons. When analysing the characteristics of the resonances, we can obtain position, value and width of the transmission peaks. We show that this phenomenon can also be observed on polar materials. Finally, a study of gratings of two directions of periodicity is made. In this case, we show that there are modes that can be highly transmitted. These modes could be excited by a dipole instead of a plane wave.
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https://tel.archives-ouvertes.fr/tel-00010113
Contributor : Francois Marquier <>
Submitted on : Monday, September 12, 2005 - 6:26:07 PM
Last modification on : Friday, July 3, 2020 - 9:28:03 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:02:07 PM

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  • HAL Id : tel-00010113, version 1

Citation

François Marquier. Interaction des ondes de surface avec des microstructures périodiques. Émission thermique cohérente et transmission résonante. Physique [physics]. Ecole Centrale Paris, 2004. Français. ⟨tel-00010113⟩

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