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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 9 — Apr. 25, 2011
  • pp: 8336–8346

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

David Regatos, Borja Sepúlveda, David Fariña, Laura G. Carrascosa, and Laura M. Lechuga  »View Author Affiliations

Optics Express, Vol. 19, Issue 9, pp. 8336-8346 (2011)

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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.

© 2011 OSA

OCIS Codes
(230.3810) Optical devices : Magneto-optic systems
(240.6680) Optics at surfaces : Surface plasmons
(280.1415) Remote sensing and sensors : Biological sensing and sensors
(310.4165) Thin films : Multilayer design
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(250.5403) Optoelectronics : Plasmonics

ToC Category:

Original Manuscript: January 25, 2011
Revised Manuscript: March 15, 2011
Manuscript Accepted: March 23, 2011
Published: April 15, 2011

Virtual Issues
Vol. 6, Iss. 5 Virtual Journal for Biomedical Optics

David Regatos, Borja Sepúlveda, David Fariña, Laura G. Carrascosa, and Laura M. Lechuga, "Suitable combination of noble/ferromagnetic metal multilayers for enhanced magneto-plasmonic biosensing," Opt. Express 19, 8336-8346 (2011)

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