Special Section on Nanostructured Thin Films

Surface plasmon sensor with enhanced sensitivity using top nano dielectric layer

[+] Author Affiliations
Amit Lahav, Atef Shalabaney, Ibrahim Abdulhalim

Department of Electro-optic Engineering, Ben Gurion University, P.O.Box 653, Beer Sheva, Israel 84105 Israel

J. Nanophoton. 3(1), 031501 (January 21, 2009). doi:10.1117/1.3079803
History: Received December 19, 2008; Revised January 13, 2009; Accepted January 14, 2009; January 21, 2009; Online January 21, 2009
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Abstract

Increasing the sensitivity of surface plasmon resonance (SPR) sensors is important to enable controlling small concentrations of materials in liquid solutions or for gas sensing. Upon using a 10-15 nm top layer of dielectric film with a high value of the real part ε'of the dielectric function, on top of an SPR sensor in the Kretschmann configuration, the sensitivity is improved by few times. The imaginary part ε"of the top nano layer 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. In the near infrared range, the sensitivity is enhanced contrary to the standard SPR mode without top nanolayer. The calculated evanescent field is enhanced near the top layer - analyte interface, thus the enhancement is partially due to this fact and partially due to an increase of the interaction length as a waveguiding effect.

© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Amit Lahav ; Atef Shalabaney and Ibrahim Abdulhalim
"Surface plasmon sensor with enhanced sensitivity using top nano dielectric layer", J. Nanophoton. 3(1), 031501 (January 21, 2009). ; http://dx.doi.org/10.1117/1.3079803


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