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 Citations (Scopus)

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 similar to 10(4). Test samples for few types of characterization schemes were fabricated. (C) 2010 Optical Society of America

Original languageEnglish
Pages (from-to)14079-14086
Number of pages8
JournalOPTICS EXPRESS
Volume18
Issue number13
DOIs
Publication statusPublished - 21 Jun 2010

Keywords

  • RADIALLY POLARIZED-LIGHT
  • POLARITONS
  • SURFACE-PLASMONS
  • LENS

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