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  • Title: Efficient coupling and field enhancement for the nano-scale: plasmonic needle.
    Author: Normatov A, Ginzburg P, Berkovitch N, Lerman GM, Yanai A, Levy U, Orenstein M.
    Journal: Opt Express; 2010 Jun 21; 18(13):14079-86. PubMed ID: 20588539.
    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.
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