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Généralisation de la méthode modale de Fourier aux problèmes de diffraction en optique intégrée. Application aux convertisseurs modaux par ingénierie des modes de Bloch.

Eric Silberstein 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Naphel
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : New nanostructured materials are very promising for future applications in integrated optic. However, two important steps are needed for make them a reality. First, it is necessary to implement numerical methods for study and design them because, their typical dimension being in the order of the wavelength, no approached model exist and only Maxwell?s laws are valid. Second, these new optical components must be connected to classical ones in order to be exploited. Unfortunatly, the largely different profil of electromagnetic modes in these two different kind of structures induce important insertion losses which dramatically reduces the performances of these components. The objectives of this work are precisely to provide a solution to these two problems. In the first section we present an original method for calculate waveguide diffractive problems. This method is derivated from the Fourier Modal Method (or RCWA) and is achieved by introduction of virtual periodicity and incorporation of artificial absorbers. In the second section, we are designing efficient tapers for short integrated Bragg mirrors by Bloch-wave engineering, using a complex-gradient index between the classical waveguide and the mirror. Numerical investigation shows that the fabrication of very short low-losses and small modal volume integrated cavities is theoretically possible. The reduction of the losses induced by the tapers are experimentally demonstrated for SOI substrates cavities.
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Submitted on : Wednesday, July 9, 2003 - 12:26:37 PM
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Eric Silberstein. Généralisation de la méthode modale de Fourier aux problèmes de diffraction en optique intégrée. Application aux convertisseurs modaux par ingénierie des modes de Bloch.. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2002. Français. ⟨tel-00003101⟩

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