Efficient coupling and field enhancement for the nano-scale: Plasmonic needle

Alexander Normatov*, Pavel Ginzburg, Nikolai Berkovitch, Gilad M. Lerman, Avner Yanai, Uriel Levy, Meir Orenstein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


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 ∼104. Test samples for few types of characterization schemes were fabricated.

Original languageAmerican English
Pages (from-to)14079-14086
Number of pages8
JournalOptics Express
Issue number13
StatePublished - 21 Jun 2010


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