title: Strong coupling between molecular excited states and surface plasmon modes of a slit array in a thin metal film.
abstract: We demonstrate strong coupling between molecular excited states and surface plasmon modes of a slit array in a thin metal film. The coupling manifests itself as an anticrossing behavior of the two newly formed polaritons. As the coupling strength grows, a new mode emerges, which is attributed to long-range molecular interactions mediated by the plasmonic field. The new, molecular-like mode repels the polariton states, and leads to an opening of energy gaps both below and above the asymptotic free molecule energy.
authors.affiliation: Chemical Physics Department, Weizmann Institute of Science, Rehovot, Israel.
authors.forename: Adi
authors.initials: A
authors.lastname: Salomon
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Gordon
authors.forename: Yehiam
authors.initials: Y
authors.lastname: Prior
authors.forename: Tamar
authors.initials: T
authors.lastname: Seideman
authors.forename: Maxim
authors.initials: M
authors.lastname: Sukharev