title: Efficient coupling and field enhancement for the nano-scale: plasmonic needle.
abstract: Theoretical demonstration of efficient coupling and power concentration of radially-polarized light on a conical tip of plasmonic needle is presented. The metallic needle is grown at the center of radial plasmonic grating, engraved in a metal surface. The electromagnetic field distribution was evaluated by Finite Elements and Finite-Difference-Time-Domain methods. The results show that the field on the tip of the needle is significantly enhanced compared to the field impinging on the grating. The power enhancement exhibited a resonant behavior as a function of needle length and reached values of approximately 10(4). Test samples for few types of characterization schemes were fabricated.
authors.affiliation: EE department, Technion - Israel Institute of Technology, Technion City, Haifa, Israel.
authors.forename: Alexander
authors.initials: A
authors.lastname: Normatov
authors.forename: Pavel
authors.initials: P
authors.lastname: Ginzburg
authors.forename: Nikolai
authors.initials: N
authors.lastname: Berkovitch
authors.forename: Gilad M
authors.initials: GM
authors.lastname: Lerman
authors.forename: Avner
authors.initials: A
authors.lastname: Yanai
authors.forename: Uriel
authors.initials: U
authors.lastname: Levy
authors.forename: Meir
authors.initials: M
authors.lastname: Orenstein
mesh_terms: D004574:Electromagnetic Fields; D008027:Light; D008962:Models, Theoretical; D049329:Nanostructures; D036103:Nanotechnology / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*