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Proceedings Paper

Sensitivity enhancement of guided wave surface plasmon resonance sensors using top nano dielectric layer
Author(s): Amit Lahav; Mark Auslender; I. Abdulhalim II
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Paper Abstract

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.

Paper Details

Date Published: 10 September 2008
PDF: 8 pages
Proc. SPIE 7041, Nanostructured Thin Films, 70410A (10 September 2008); doi: 10.1117/12.794167
Show Author Affiliations
Amit Lahav, Ben Gurion Univ. (Israel)
Mark Auslender, Ben Gurion Univ. (Israel)
I. Abdulhalim II, Ben Gurion Univ. (Israel)

Published in SPIE Proceedings Vol. 7041:
Nanostructured Thin Films
Geoffrey B. Smith; Akhlesh Lakhtakia, Editor(s)

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