Plasmonic focusing with a coaxial structure illuminated by radially polarized light

Avner Yanai*, Uriel Levy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

We propose and analyze a plasmonic lens that is illuminated by a radially polarized light. The lens is made of a coax-like geometry consisting of an annular dielectric slit surrounded by metal. Focusing efficiency is enhanced by the use of a circular grating assisting the coupling of light into surface plasmons. Further enhancement is obtained by introducing a circular Bragg grating on top of the structure, reflecting the surface plasmon modes that are propagating in the counter-focus direction. Using the Finite-Difference Time-Domain approach we investigate the transmission and the focusing mechanisms, and study the effect of structural parameters on the performance of the plasmonic lens.

Original languageAmerican English
Pages (from-to)924-932
Number of pages9
JournalOptics Express
Volume17
Issue number2
DOIs
StatePublished - 19 Jan 2009

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