Improving the performances of surface Plasmon resonance sensor in the infrared region by adding thin dielectric over-layer

Atef Shalabney, Ibrahim Abdulhalim

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

4 Scopus citations

Abstract

The implications of adding thin dielectric film with high refractive index (RI) on top of the transducer metallic layer in surface Plasmon resonance (SPR) sensors are extensively investigated particularly in the infrared in the spectral mode. An over-layer made of silicon with thickness of about 10 nm is introduced on top of the silver metallic layer in SPR sensors when the Kretschmann-Raether (KR) configuration is used. The spectral interrogation is considered and the thickness of the dielectric over-layer is below the cutoff thickness of the lowest guided TM mode. The additional film causes to red-shift the resonance wavelength, narrowing of the dip in the reflectance spectrum, and enhancing the spectral sensitivity and the figure of merit (FOM) of the sensor. Furthermore, adding the top dielectric film enhances the electromagnetic fields at the analyte interface, increases the penetration depth inside the sensed medium, and improves the stability of the sensor.

Original languageEnglish
Title of host publication2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012
DOIs
StatePublished - 1 Dec 2012
Externally publishedYes
Event2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012 - Eilat, Israel
Duration: 14 Nov 201217 Nov 2012

Publication series

Name2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012

Conference

Conference2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012
Country/TerritoryIsrael
CityEilat
Period14/11/1217/11/12

Keywords

  • optical biosensors
  • sensitivity enhancement
  • surface Plasmon resonance (SRP)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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