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We present useful expressions predicting the filling time of gaseous species inside photonic crystal fibers. Based on the theory of diffusion, this gas-filling model can be applied to any given fiber geometry or length by calculating diffusion coefficients. This was experimentally validated by monitoring the filling process of acetylene gas in several fiber(More)
High-resolution infrared absorption spectroscopy of acetylene gas is demonstrated in a dispersion-engineered photonic crystal waveguide under slow-light propagation. Experimental enhancement factors of 0.31 and 1.00 are obtained for TE and TM polarization, respectively, for group indices ranging from 1.5 to 6.7. The dependence of molecular absorption on the(More)
PAR Isabelle DICAIRE ACKNOWLEDGEMENTS This thesis has been realised in the Group for Fibre Optics at EPFL under the supervision of Prof. Luc Thévenaz. First and foremost I wish to warmly thank him for allowing me to join his group and for believing in my abilities to do scientific research. He always welcomed my questions and helped me to improve my(More)
Global efforts made by the international community to reduce anthropogenic greenhouse gas emissions have not been successful yet to adequately address the challenge posed by climate change. On the contrary, global carbon emissions are still rising, raising the need to consider alternative backup options to mitigate global warming. Such solutions are known(More)
Deep Hα observations of the Sculptor Group galaxy NGC 7793 were obtained on the ESO 3.60m and the Marseille 36cm telescopes at La Silla, Chile. Hα emission is detected all the way to the edge of the H I disk, making of the H II disk of NGC 7793 one of the largest ever observed in a quiet non-AGN late– type system. Even in the very outer parts, the H II(More)
A couple of experiments are here presented to clarify the impact of slow light on light-matter interaction. The experiments are designed, so that the process generating slow light and the probed light-matter interaction only present a marginal cross-effect. The impact of slow light on simple molecular absorption could be separately evaluated under either(More)
Silk possesses extraordinary properties that scientists are currently working hard on harnessing. Amongst them, this primeval material has shown early potential of having excellent optical properties. Through a regeneration process, it is possible to obtain silk films made from fibres of silk cocoons, by casting a silk fibron solution on an appropriate(More)
Keywords: Space systems Remote sensing Natural disaster prevention Space solar power Tropical cyclones Hazard mitigation a b s t r a c t This paper investigates potential space options for mitigating the impact of tropical cyclones on cities and civilians. Ground-based techniques combined with space-based remote sensing instrumentation are presented(More)