Propagation et Emission dans des guides multimodes à cristaux photoniques bidimensionnels

Abstract : The physics of a Fabry Perot cavity with grating mirrors, substantiated here by a multimode 2D photonic crystal waveguide, is investigated from a mainly experimental point of view. Applications in the field of optical telecommunications around 1.55µm, as well as more fundamental issues are addressed. The guide walls consist of a periodic grating of air holes etched through a InP-based heterostructure. They are completely reflecting within the photonic band gap for any wave impinging within the periodicity plane. The periodicity along the guide couples through Bragg diffraction guided modes, with "ordinary" group velocity, with very slow modes, analogous to resonant modes. The new feature about this coupling is that it occurs only within small frequency and wavevector windows, remaining silent elsewhere. This coupling is firstly used to design a wavelength multiplexer/demultiplexer, extracting, laterally with respect to the guide direction and selectively, all or part of the guided optical signal. The following and more fundamental parts of this manuscript investigate the potential impact of the spectral regions nearby these coupling windows in order to control the spontaneous emission of photons within these confining and diffractive structures. We present a striking experimental spontaneous emission enhancement, related to a peaked photon density of states. The last part deals with a measurement of the modal gain spectrum: the consequence of the slowing of a guided mode around the coupling window onto the optical amplification of a propagating signal is discussed.
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https://pastel.archives-ouvertes.fr/tel-00007122
Contributor : Emilie Viasnoff-Schwoob <>
Submitted on : Thursday, October 14, 2004 - 12:09:32 PM
Last modification on : Wednesday, November 29, 2017 - 3:50:59 PM
Long-term archiving on : Thursday, September 13, 2012 - 12:15:47 PM

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Emilie Viasnoff-Schwoob. Propagation et Emission dans des guides multimodes à cristaux photoniques bidimensionnels. Physique [physics]. Université Paris Sud - Paris XI, 2004. Français. ⟨tel-00007122⟩

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