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Sondes actives en champ proche pour la plasmonique et la plasmonique quantique

Abstract : Surface plasmons (SPs) are modes of the electromagnetic field confined at the interface between a metal and a dielectric. Due to their hybrid nature, the SPs can be used to concentrate and handle light on subwavelength scales. These unprecedented properties draw great interest, in particular for quantum information transport and processing and also for the control of spontaneous emission of fluorescent emitters. The studies presented in this manuscript report the coupling of plasmonic nanostructures with luminescent nanoparticles. The tool we use is a scanning near-field optical microscope (SNOM), in which the nano-source of light is a fluorescent nano-object attached at the end of the probe (active tip). This technique allows not only to reach a better optical resolution in SNOM but also to position the nano-emitter with a nanometre precision and to excite it directly thanks to the laser light injected into the optical fibre. By using only the light emitted by the object, these tips open the way to original studies in nano-optics and plasmonics. In this work, two distinct aspects were studied. First, we studied the properties of the SPs in the quantum plasmonics regime. For this purpose, we used an active tip based on single photons emitters which are the NV centres (nitrogen-vacancy centre) hosted in nanodiamonds. The fundamental results obtained on this system make it possible to consider many other quantum plasmonics experiments. In addition, a different type of active tips based on Cerium-doped YAG (yttrium-aluminum garnet) nanoparticules was developed. These probes allow us to start new studies on localised plasmonic resonances in colloidal gold particles.
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Submitted on : Thursday, December 20, 2012 - 3:37:13 PM
Last modification on : Tuesday, October 19, 2021 - 10:50:29 PM
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  • HAL Id : tel-00767888, version 1




Oriane Mollet. Sondes actives en champ proche pour la plasmonique et la plasmonique quantique. Autre [cond-mat.other]. Université de Grenoble, 2012. Français. ⟨NNT : 2012GRENY057⟩. ⟨tel-00767888⟩



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