Asymmetric split ring resonators for optical sensing of organic materials

Basudev Lahiri, Ali Z. Khokhar, Richard M. De La Rue, Scott G. McMeekin, Nigel P. Johnson

Research output: Contribution to journalArticle

Abstract

Asymmetric Split Ring Resonators are known to exhibit resonant modes where the optical electric field is strongest near the ends of the arms, thereby increasing the sensitivity of spectral techniques such as surface enhanced Raman scattering (SERS). By producing asymmetry in the structures, the two arms of the ring produce distinct plasmonic resonances related to their lengths – but are also affected by the presence of the other arm. This combination leads to a steepening of the slope of the reflection spectrum between the resonances that increases the sensitivity of the resonant behavior to the addition of different molecular species.

Original languageEnglish
Pages (from-to)1107-1115
Number of pages9
JournalOptics Express
Volume17
Issue number2
DOIs
Publication statusPublished - 1 Jan 2009

Keywords

  • split ring resonators
  • optical electric field
  • optical sensors

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