title: Novel complex modes in asymmetrical nanoscale plasmonic waveguides.
abstract: Highly asymmetrical plasmonic waveguides exhibit guiding even below the expected cut-off dimensions. A new family of discrete complex guided modes of asymmetrical waveguides with losses--which may assist in nano plasmonic guiding, is found by employing the effective index method. These modes having a real effective index lower than the substrate index of refraction can be exhibited also in regular (lossy) photonics.
authors.affiliation: EE Department, Technion, Haifa 32000, Israel. nikolaib@tx.technion.ac.il
authors.forename: Nikolai
authors.initials: N
authors.lastname: Berkovitch
authors.forename: Meir
authors.initials: M
authors.lastname: Orenstein
authors.forename: Stephen G
authors.initials: SG
authors.lastname: Lipson