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Extraction de la lumière par des nanoparticules métalliques enterrées dans des films minces

Anthony Jouanin 1
1 Laboratoire Charles Fabry / Naphel
LCF - Laboratoire Charles Fabry
Abstract : Metallic nanoparticles (MNps) exhibit strong plasmonic resonances in their absorption and scattering spectra. Recent advances in micro- and nano-fabrication processes allow scientists to control the particle shape; and thus to tune these resonances on the visible and near-IR spectrum - opening unprecedented applications ranging from imaging techniques to solar cells improvement. In the present work, we numerically investigate the capacity of MNps to (de)couple the light that is confined in guided modes of dielectric thin films—a relevant system to analyze, understand and reduce the light trapping phenomenon that strongly lowers the efficiency of some electroluminescent devices. To this end, we propose, by the control of its polarization state, to optimize the quantity of light that a nanoparticle extracts during a scattering event. For a sole source embedded in the guide, barely 20% of the light is extracted (rad~0.2). The addition of an ultra-thin layer composed of hundreds of randomly deposited engineered-nanoparticles shows promising results with rad ~0.7 (in realistic configurations). Interesting coherence effects arising from the randomness of the disorder are also evidenced.
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https://pastel.archives-ouvertes.fr/pastel-01061272
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Submitted on : Friday, September 5, 2014 - 2:22:14 PM
Last modification on : Monday, August 5, 2019 - 2:50:48 PM
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Anthony Jouanin. Extraction de la lumière par des nanoparticules métalliques enterrées dans des films minces. Optique [physics.optics]. Institut d’Optique Graduate School, 2014. Français. ⟨NNT : 2014IOTA0004⟩. ⟨pastel-01061272⟩

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