Theoretical and computational concepts for periodic optical waveguides

Guillaume Lecamp 1 Jean-Paul Hugonin 1 Philippe Lalanne 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Naphel
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : We present a general, rigorous, modal formalism for modeling light propagation and light emission in three-dimensional (3D) periodic waveguides and in aggregates of them. In essence, the formalism is a generalization of well-known modal concepts for translation-invariant waveguides to situations involving stacks of periodic waveguides. By surrounding the actual stack by perfectly-matched layers (PMLs) in the transverse directions, reciprocity considerations lead to the derivation of Bloch-mode orthogonality relations in the sense of ExH products, to the normalization of these modes, and to the proof of the symmetrical property of the scattering matrix linking the Bloch modes. The general formalism, which rigorously takes into account radiation losses resulting from the excitation of radiation Bloch modes, is implemented with a Fourier numerical approach. Basic examples of light scattering like reflection, transmission and emission in periodic-waveguides are accurately resolved.
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Optics Express, Optical Society of America, 2007, 15 (18), pp.11042-11060
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Guillaume Lecamp, Jean-Paul Hugonin, Philippe Lalanne. Theoretical and computational concepts for periodic optical waveguides. Optics Express, Optical Society of America, 2007, 15 (18), pp.11042-11060. 〈hal-00869734〉

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