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Enhancement of diffraction for biosensing applications via Bloch surface waves

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2 Author(s)
Liscidini, M. ; Department of Physics and Institute for Optical Sciences, University of Toronto, 60 St. George Street, Ontario M5S 1A7, Canada ; Sipe, J.E.

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We propose a biosensor based on the diffraction of Bloch surface waves (BSWs) in periodic dielectric stacks. Significant enhancement of diffraction efficiency by a biomolecule grating placed on the multilayer is predicted when a BSW is excited through a prism in the Kretschmann configuration. Numerical calculations for BSW in a Si/SiO2 dielectric stack show an increase of diffraction intensity up to three orders of magnitude with respect to the case of surface plasmon wave enhancement. The mechanism that leads to large field confinement and the absence of absorption losses in the dielectric system make this solution flexible and suitable to different grating periods.

Published in:

Applied Physics Letters  (Volume:91 ,  Issue: 25 )

Date of Publication:

Dec 2007

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