title: Beyond the hybridization effects in plasmonic nanoclusters: diffraction-induced enhanced absorption and scattering.
abstract: It is demonstrated herein both theoretically and experimentally that Young's interference can be observed in plasmonic structures when two or three nanoparticles with separation on the order of the wavelength are illuminated simultaneously by a plane wave. This effect leads to the formation of intermediate-field hybridized modes with a character distinct of those mediated by near-field and/or far-field radiative effects. The physical mechanism for the enhancement of absorption and scattering of light due to plasmonic Young's interference is revealed, which we explain through a redistribution of the Poynting vector field and the formation of near-field subwavelength optical vortices.
authors.affiliation: Data Storage Institute, A*STAR (Agency for Science Technology and Research), DSI Building, 5 Engineering Drive 1, 117608, Singapore; Department of Physics, Imperial College London, London, SW7 2AZ, United Kingdom; Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
authors.forename: Mohsen
authors.initials: M
authors.lastname: Rahmani
authors.forename: Andrey E
authors.initials: AE
authors.lastname: Miroshnichenko
authors.forename: Dang Yuan
authors.initials: DY
authors.lastname: Lei
authors.forename: Boris
authors.initials: B
authors.lastname: Luk'yanchuk
authors.forename: Michael I
authors.initials: MI
authors.lastname: Tribelsky
authors.forename: Arseniy I
authors.initials: AI
authors.lastname: Kuznetsov
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar
authors.forename: Yan
authors.initials: Y
authors.lastname: Francescato
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Giannini
authors.forename: Minghui
authors.initials: M
authors.lastname: Hong
authors.forename: Stefan A
authors.initials: SA
authors.lastname: Maier
mesh_terms: D000042:Absorption; D019281:Dimerization; D004601:Elementary Particles; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D012542:Scattering, Radiation; D013050:Spectrometry, Fluorescence; D013816:Thermodynamics; D014961:X-Ray Diffraction
keywords: Young's interference; plasmon hybridization; sub-wavelength nanostructures; surface plasmons