title: Self-assembled plasmonic core-shell clusters with an isotropic magnetic dipole response in the visible range.
abstract: We theoretically analyze, fabricate, and characterize a three-dimensional plasmonic nanostructure that exhibits a strong and isotropic magnetic response in the visible spectral domain. Using two different bottom-up approaches that rely on self-organization and colloidal nanochemistry, we fabricate clusters consisting of dielectric core spheres, which are smaller than the wavelength of the incident radiation and are decorated by a large number of metallic nanospheres. Hence, despite having a complicated inner geometry, such a core-shell particle is sufficiently small to be perceived as an individual object in the far field. The optical properties of such complex plasmonic core-shell particles are discussed for two different core diameters.
authors.affiliation: Institute of Condensed Matter Theory and Solid State Optics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany. stefan.muehlig@uni-jena.de
authors.forename: Stefan
authors.initials: S
authors.lastname: Mühlig
authors.forename: Alastair
authors.initials: A
authors.lastname: Cunningham
authors.forename: Sebastian
authors.initials: S
authors.lastname: Scheeler
authors.forename: Claudia
authors.initials: C
authors.lastname: Pacholski
authors.forename: Thomas
authors.initials: T
authors.lastname: Bürgi
authors.forename: Carsten
authors.initials: C
authors.lastname: Rockstuhl
authors.forename: Falk
authors.initials: F
authors.lastname: Lederer
mesh_terms: D060328:Magnetic Phenomena; D054118:Nanospheres / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D012825:Silicon / Q000737:chemistry
chemical_list: D012825:Silicon