Extreme field enhancement in nano-gap plasmonic cavity via 90% efficient coupling with silicon waveguide

Young Ho Jin, Byoung Jun Park, Myung-Ki Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We propose a novel design for a sub-5-nm-gap plasmonic cavity to couple it efficiently with an integrated low loss silicon waveguide. We numerically obtain over 90% efficient coupling between a nano-gap plasmonic cavity with a modal volume of less than 10-7 λ3 and a conventional silicon-on-insulator (SOI) waveguide by utilizing the anti-symmetric second-order resonance mode of the cavity and engineering its geometry to reduce the modal size to less than 5 nm. The electromagnetic field efficiently coupled to the small cavity, leading to extreme enhancement of the field intensity. For a 2-nm-gap cavity, the intensity enhancement was calculated to be more than 100,000,000 compared to that of light in an SOI waveguide.

Original languageEnglish
Pages (from-to)25540-25547
Number of pages8
JournalOptics Express
Volume24
Issue number22
DOIs
Publication statusPublished - 2016 Oct 31

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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