Modelling and characterisation of surface plasmon based sensors for the detection of E. coli

M. Rajarajan, T. Dar, C. Themistos, B. M.A. Rahman, K. T.V. Grattan, J. Homola, J. Irudayaraj

Research output: Contribution to journalArticle

Abstract

The finite element method based on the full-vectorial H-field formulation incorporating the perturbation techniques has been employed to calculate the complex propagation characteristics, the formation of the coupled supermodes, and power fraction in the different regions, modal loss, differential loss and coupling length. The influence of the outer medium refractive index on the inner and outer surface plasmon modes (SPR) is investigated to achieve the best coupling and sensitivity. Finally the SRP fibre optic sensor design is numerically optimised for the maximum field penetration in the outer medium.

Original languageEnglish (US)
Pages (from-to)564-571
Number of pages8
JournalJournal of Modern Optics
Volume56
Issue number4
DOIs
StatePublished - Feb 1 2009
Externally publishedYes

Keywords

  • Biosensor
  • E. coli
  • Fibre optics
  • Finite element method
  • Full-vectorial H-field formulation
  • Surface plasmon resonance

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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