title: Mie and Bragg plasmons in subwavelength silver semi-shells.
abstract: 2D arrays of silver semi-shells of 100 and 200 nm diameter display complex reflection and transmission spectra in the visible and near-IR. Here these spectral features are deconstructed and it is demonstrated that they result from the coupling of incident light into a delocalized Bragg plasmon, and the latter's induction of localized Mie plasmons in the arrays. These phenomena permit the excitation of transverse dipolar plasmon resonances in the semi-shells despite an ostensibly unfavorable orientation with respect to normally incident light. The resulting spectral feature in the mid-visible is strong and tunable.
authors.affiliation: Institute for Nanoscale Technology, University of Technology, Sydney PO Box 123, Broadway NSW 2007, Australia.
authors.forename: Abbas I
authors.initials: AI
authors.lastname: Maaroof
authors.forename: Michael B
authors.initials: MB
authors.lastname: Cortie
authors.forename: Nadine
authors.initials: N
authors.lastname: Harris
authors.forename: Lech
authors.initials: L
authors.lastname: Wieczorek
mesh_terms: D053758:Nanoparticles / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance
chemical_list: D011137:Polystyrenes; D012834:Silver