Suitable combination of noble/ferromagnetic metal multilayers for enhanced magneto-plasmonic biosensing

We present a theoretical and experimental study on the biosensing sensitivity of Au/Co/Au multilayers as transducers of the magneto-optic surface-plasmon-resonance (MOSPR) sensor. We demonstrate that the sensing response of these magneto-plasmonic (MP) transducers is a trade-off between the optical...

Full description

Saved in:
Bibliographic Details
Published in:Optics express 2011-04, Vol.19 (9), p.8336-8346
Main Authors: Regatos, David, Sepúlveda, Borja, Fariña, David, Carrascosa, Laura G, Lechuga, Laura M
Format: Article
Language:English
Subjects:
Biosensing Techniques - instrumentation
Equipment Design
Equipment Failure Analysis
In Situ Hybridization - instrumentation
Magnetics - instrumentation
Metals - chemistry
Surface Plasmon Resonance - instrumentation
Systems Integration
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present a theoretical and experimental study on the biosensing sensitivity of Au/Co/Au multilayers as transducers of the magneto-optic surface-plasmon-resonance (MOSPR) sensor. We demonstrate that the sensing response of these magneto-plasmonic (MP) transducers is a trade-off between the optical absorption and the magneto-optical activity, observing that the MP multilayer with larger MO effect does not provide the best sensing response. We show that it is possible to design highly-sensitive MP transducers able to largely surpass the limit of detection of the conventional surface-plasmon-resonance (SPR) sensor. This was proved comparing the biosensing performance of both sensors for the label-free detection of short DNA chains hybridization. For this purpose, we used and tested a novel label-free biofunctionalization protocol based on polyelectrolytes, which increases the resistance of MP transducers in aqueous environments.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.19.008336