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

AuthorsRegatos, David CSIC; Sepúlveda, Borja CSIC ORCID; Fariña, David CSIC ORCID; Carrascosa, Laura G. CSIC ORCID; Lechuga, Laura M. CSIC ORCID
Issue DateApr-2011
PublisherOptical Society of America
CitationOptics Express 19(9): 8336-8346 (2011)
AbstractWe 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.
Description11 páginas, 7 figuras, 1 tabla.
Publisher version (URL)http://dx.doi.org/10.1364/OE.19.008336
Appears in Collections:(CIN2) Artículos
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