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Conference on Lasers and Electro-Optics

Quantum theory of spontaneous emission in multilayer dielectric structures

Celestino Creatore, Andreani

Published Jan 1, 2008• 0 citations
Publisher
DOI
10.1109/qels.2008.4552993

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 1, 1997•1 citation
A complete set of cavity modes in planar dielectric multilayer structures is presented which naturally includes the guided modes. We show that most of these orthonormal fields can be derived from a coherent superposition of plane waves incident on the stack from the air and from the substrate. Using this set of cavity modes, we present a quantization scheme in idealized lossless stratified dielectric structures. This enables us to discuss the vacuum quantum fluctuations of the fields within the multilayer stack. The spontaneous emission of photons by a two-level atom located at any position inside the stratified planar structure is derived using the quantum approach and standard perturbation theory. The spontaneous emission rate as well as the radiation pattern in the air, in the substrate and in the guided mode are presented. Finally, a numerical analysis of the radiative properties of an erbium atom located in an asymmetrical Fabry - Perot multilayer structure is investigated. We show that a large part of the emitted power is directed in one half-space although a significant amount of light remains trapped in the guided modes of the structure.
We investigate theoretically and experimentally the optical properties of planar Ta2O5/SiO2 multilayer structures implanted with rare earth ions such as erbium and praseodymium. We demonstrate that the spontaneous emission can be strongly enhanced in a direction normal to the layers if the luminescent ions are located in the spacer of a resonant Fabry-Perot type microcavity. Nevertheless, we show that a large amount of light is emitted into the guided modes of the planar stack reducing the optical confinement which is likely to be reached within this type of dielectric microcavities.