title: Plasmonic mode interferences and Fano resonances in Metal-Insulator-Metal nanostructured interface.
abstract: Metal-insulator-metal systems exhibit a rich underlying physics leading to a high degree of tunability of their spectral properties. We performed a systematic study on a metal-insulator-nanostructured metal system with a thin 6 nm dielectric spacer and showed how the nanoparticle sizes and excitation conditions lead to the tunability and coupling/decoupling of localized and delocalized plasmonic modes. We also experimentally evidenced a tunable Fano resonance in a broad spectral window 600 to 800 nm resulting from the interference of gap modes with white light broad band transmitted waves at the interface playing the role of the continuum. By varying the incident illumination angle shifts in the resonances give the possibility to couple or decouple the localized and delocalized modes and to induce a strong change of the asymmetric Fano profile. All these results were confirmed with a crossed comparison between experimental and theoretical measurements, confirming the nature of different modes. The high degree of control and tunability of this plasmonically rich system paves the way for designing and engineering of similar systems with numerous applications. In particular, sensing measurements were performed and a figure of merit of 3.8 was recorded ranking this sensor among the highest sensitive in this wavelength range.
authors.affiliation: Laboratoire de Nanotechnologie et d'Instrumentation Optique, ICD CNRS UMR 6281, Université de Technologie de Troyes, CS 42060, 10004 Troyes, France.|Laboratoire de Physique Appliqué (LPA), Université Libanaise, Faculté des Sciences 2, Campus Fanar - BP 90656 - Jdeideh - Liban.
authors.forename: Rana
authors.initials: R
authors.lastname: Nicolas
authors.affiliation: Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN, CNRS-8520), Cité Scientifique, Avenue Poincaré, 59652 Villeneuve d'Ascq, France.
authors.forename: Gaëtan
authors.initials: G
authors.lastname: Lévêque
authors.affiliation: Laboratoire de Nanotechnologie et d'Instrumentation Optique, ICD CNRS UMR 6281, Université de Technologie de Troyes, CS 42060, 10004 Troyes, France.|Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée, ICD CNRS UMR STMR 6281, Université de Technologie de Troyes, CS 42060, 10004 Troyes, France.|Ermess, EPF-Ecole d'Ingénieurs, Sceaux, France.
authors.forename: Joseph
authors.initials: J
authors.lastname: Marae-Djouda
authors.affiliation: Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée, ICD CNRS UMR STMR 6281, Université de Technologie de Troyes, CS 42060, 10004 Troyes, France.
authors.forename: Guillame
authors.initials: G
authors.lastname: Montay
authors.affiliation: Ermess, EPF-Ecole d'Ingénieurs, Sceaux, France.|Centre des Matériaux, Mines ParisTech, UMR CNRS 7633, BP 87, 91003 Evry Cedex, France.
authors.forename: Yazid
authors.initials: Y
authors.lastname: Madi
authors.affiliation: Laboratoire de Nanotechnologie et d'Instrumentation Optique, ICD CNRS UMR 6281, Université de Technologie de Troyes, CS 42060, 10004 Troyes, France.
authors.forename: Jérôme
authors.initials: J
authors.lastname: Plain
authors.affiliation: Laboratoire de Physique Appliqué (LPA), Université Libanaise, Faculté des Sciences 2, Campus Fanar - BP 90656 - Jdeideh - Liban.
authors.forename: Ziad
authors.initials: Z
authors.lastname: Herro
authors.affiliation: Department of Physics, American University of Beirut, Riad El-Solh 1107 2020, Beirut, Lebanon.
authors.forename: Michel
authors.initials: M
authors.lastname: Kazan
authors.affiliation: Laboratoire de Nanotechnologie et d'Instrumentation Optique, ICD CNRS UMR 6281, Université de Technologie de Troyes, CS 42060, 10004 Troyes, France.
authors.forename: Pierre-Michel
authors.initials: PM
authors.lastname: Adam
authors.affiliation: Laboratoire de Nanotechnologie et d'Instrumentation Optique, ICD CNRS UMR 6281, Université de Technologie de Troyes, CS 42060, 10004 Troyes, France.
authors.forename: Thomas
authors.initials: T
authors.lastname: Maurer