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samedi 27 juillet
Mise à jour
mercredi 24 juillet
Accueil > Équipes scientifiques > Nanophysique et Surfaces (Nanophys) > Publications > 2024
2024
Peer-reviewed Publications |
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Raseev, G. (2024). Optical intensity figures of merit of insulator-metal-insulator and metal-insulator-metal thin-film stacks. Phys. Scr., 99, 085535.
Résumé: Figures of merit (FoM) are used to characterise the mode intensity and leakage of reflection and plane-wave and locally excited transmitted fluxes of simple insulator-metal-insulator (IMI) and metal-insulator-metal (MIM) 2D planar thin-film stacks sustaining a single surface plasmon polariton (SPP) and multiple planar waveguide (PWG) modes. This first comparative study of the intensity FoM (IFoM) of IMI and MIM stack modes is carried out by analysing these observables 3D dispersion graph (observable dispersion/in-plane wave vector/frequency) along 2D cuts where one of the independent variables is fixed. In the spatial domain, the observable 2D dispersion curves along the in-plane wave vector at a given frequency are examined. In the frequency domain, these 2D dispersion curves are examined along the frequency at a given in-plane wave vector. Due to the lower leakage, the quality factors and IFoM of the IMI and MIM thin film stack modes are significantly larger in the spatial domain than in the frequency domain. Our optimized quality factors and IFoMs can be larger than those obtained in some 2D/3D nanoscale samples with an involved geometry.
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Zapata-Herrera, M., Rogez, B., Marguet, S., Dujardin, G., Boer-Duchemin, E., & Le Moal, E. (2024). Spectral shifts in tip-induced light from plasmonic nanoparticles in air. Phys. Rev. B, 109(15), 155433.
Résumé: In this article, we carry out an in-depth study of the scanning tunneling microscopy-induced luminescence spectra (STML) of individual plasmonic nanoparticles measured in air. When compared to the results of far-field light scattering measured under the same ambient conditions, the STML measurements show spectral shifts and peak broadening of hundreds of meV, even when a non-plasmonic tip is used for STML. We simulate the near-field excitation and the effect of the tip using the finite-element method and show that these effects alone cannot explain the spectral shifts and peak broadening observed for STML experiments in air. However, the experimental results are well reproduced in the numerical simulations if the screening effect of a water meniscus bridge present in the tip-nanoparticle gap is considered. Our results pave the way for finer interpretations of STML experiments in air, where ignoring this additional screening effect can lead to an incorrect mode assignment of the observed resonances.
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