title: Modal engineering of Surface Plasmons in apertured Au Nanoprisms.
abstract: Crystalline gold nanoprisms of sub-micrometric size sustain high order plasmon modes in the visible and near infrared range that open a new realm for plasmon modal design, integrated coplanar devices and logic gates. In this article, we explore the tailoring of the surface plasmon local density of states (SP-LDOS) by embedding a single defect, namely a small hole, carved in the platelet by focused ion beam (FIB). The change in the SP-LDOS of the hybrid structure is monitored by two-photon luminescence (TPL) microscopy. The dependency of the two-dimensional optical field intensity maps on the linear polarization of the tightly focused femtosecond laser beam reveals the conditions for which the hole defect significantly affects the initial modes. A detailed numerical analysis of the spectral characteristics of the SP-LDOS based on the Green dyadic method clearly indicates that the hole size and location can be exploited to tune or remove selected SP modes.
authors.affiliation: CEMES, CNRS (UPR 8011) and University of Toulouse, 29 rue Jeanne Marvig, BP 94347, 31055 Toulouse, France.
authors.forename: Aurélien
authors.initials: A
authors.lastname: Cuche
authors.affiliation: CEMES, CNRS (UPR 8011) and University of Toulouse, 29 rue Jeanne Marvig, BP 94347, 31055 Toulouse, France.|ICB, University of Bourgogne and CNRS (UMR 6303), 9 av. Alain Savary, BP 47870, 21078 Dijon, France.
authors.forename: Sviatlana
authors.initials: S
authors.lastname: Viarbitskaya
authors.affiliation: CEMES, CNRS (UPR 8011) and University of Toulouse, 29 rue Jeanne Marvig, BP 94347, 31055 Toulouse, France.
authors.forename: Jadab
authors.initials: J
authors.lastname: Sharma
authors.affiliation: CEMES, CNRS (UPR 8011) and University of Toulouse, 29 rue Jeanne Marvig, BP 94347, 31055 Toulouse, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Arbouet
authors.affiliation: CEMES, CNRS (UPR 8011) and University of Toulouse, 29 rue Jeanne Marvig, BP 94347, 31055 Toulouse, France.
authors.forename: Christian
authors.initials: C
authors.lastname: Girard
authors.affiliation: CEMES, CNRS (UPR 8011) and University of Toulouse, 29 rue Jeanne Marvig, BP 94347, 31055 Toulouse, France.
authors.forename: Erik
authors.initials: E
authors.lastname: Dujardin