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

D. Regatos, B. Sepúlveda, D. Fariña, L. G. Carrascosa, and L. M. Lechuga

Opt. Express, 19, 2011, 8336-8346 - DOI: 10.1364/OE.19.008336

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-9-8336

Abstract: 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

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