Prism dispersion effects in near-guided-wave surface plasmon resonance sensors

A. Shalabney, I. Abdulhalim

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Refractive index dispersion causes the light line to curve. As a result it is shown that when the prism is dispersive, an additional dip in the spectral response of Surface Plasmon Resonance (SPR) sensors is observed in the Kretschmann-Raether (KR) configuration. Since the new dip evolves in the infrared (IR) region, it exhibits a high sensitivity to the analyte refractive index (RI) changes and the mode penetrates deeper into the analyte. Adding a thin dielectric layer with high refractive index on top of the metallic layer enables to control the dip location and strength. The two dips shift in opposite directions as the analyte RI changes and therefore when the spectral difference is considered as the measurand, higher RI sensitivity is obtained. The dispersion relation of two thin films bounded by two semi-infinite media is derived when the prism dispersion is considered. Refractive index dispersion causes the light line to curve. As a result it is shown that when the prism is dispersive, an additional dip in the spectral response of Surface Plasmon Resonance (SPR) sensors is observed in the Kretschmann-Raether configuration. Since the new dip evolves in the infrared region, it exhibits a high sensitivity to the analyte refractive index changes and the mode penetrates deeper into the analyte.

Original languageEnglish
Pages (from-to)680-686
Number of pages7
JournalAnnalen der Physik
Volume524
Issue number11
DOIs
StatePublished - 1 Nov 2012

Keywords

  • Surface plasmon resonance (SPR)
  • dispersion relation
  • prism dispersion
  • spectral sensitivity

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