Plasmonics

, Volume 4, Issue 1, pp 37–50

Localization of Near-Field Resonances in Bowtie Antennae: Influence of Adhesion Layers

  • Xiaojin Jiao
  • Jeremy Goeckeritz
  • Steve Blair
  • Mark Oldham
Article

Abstract

The near-field resonances of gold bowtie antennae are numerically modeled. Besides the short-range surface plasmon polariton (SR-SPP) mode along the main axis of the structure, a coupled SPP mode is also found in the gap region (G-SPP). The influence of adhesion layers is considered, which depends on the refractive index and the absorption of the adhesion material and whether it is continuous or etched. A high refractive index causes the peak of the SR-SPP to red-shift. High absorption quenches the intensity of the SR-SPP. The magnitude of influence depends on the overlap of the adhesion layer with the SR-SPP and G-SPP modes. The near-field resonance of the SPP mode on the top surface is also considered. An etched metal adhesion layer changes the near-field localization in the gap and causes the enhancement peaks at different heights within the gap to red-shift from top to bottom. A simple optimization method for the near-field localization by the combination of different top and bottom layers is demonstrated.

Keywords

Bowtie antennae Surface plasmons Adhesion layers 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Xiaojin Jiao
    • 1
  • Jeremy Goeckeritz
    • 1
  • Steve Blair
    • 1
  • Mark Oldham
    • 2
  1. 1.Department of Electrical and Computer EngineeringUniversity of UtahSalt Lake CityUSA
  2. 2.Applied BiosystemsApplera CorporationFoster CityUSA

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