Sensitivity enhancement of guided wave surface plasmon resonance sensors using top nano dielectric layer

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


Surface plasmon resonance (SPR) and guided wave SPR (GWSPR) are widely used in sensing. Efforts to improve the sensitivity and stability of these sensors are done by using different multilayer nanostructures such as with the long range SPR and the use of combinations of materials such as gold and silver. Silver based SPR sensors have high sensitivity but a poor stability because of the interactions with water and air. We have shown both theoretically and experimentally that by using the silver based SPR sensor with a 10-15 nm top layer of dielectric film with a high value of the real part ε′ of the dielectric function, it is possible to improve the sensitivity of the sensor by few times. The imaginary part ε″ of the top nano layer's permittivity needs to be small enough in order to reduce the losses and get sharper dips. The stability of the sensor is also improved because the nano layer is protecting the silver from interacting with the environment. The calculated evanescent field is enhanced near the top layer - analyte interface, thus the enhancement is due to this and due to an increase of the interaction length as a waveguiding effect.

Original languageEnglish
Title of host publicationNanostructured Thin Films
StatePublished - 21 Nov 2008
EventNanostructured Thin Films - San Diego, CA, United States
Duration: 13 Aug 200814 Aug 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceNanostructured Thin Films
Country/TerritoryUnited States
CitySan Diego, CA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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