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Proceedings Paper

Limit of detection comparison for surface wave biosensors
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Paper Abstract

Bloch surface waves (BSW) propagating at the surface of truncated, one-dimensional crystals are valid candidates to improve sensors based on surface plasmon polaritons, usually referred to as surface plasmon resonance (SPR). The low losses introduced by the dielectric BSW stacks enable to achieve resonance widths much below the ones of SPR, thus proposing improved sensing results. A simplified, bi-linear model of the resonance intensity distribution is applied to estimate the effect of the resonance properties onto the measurement noise. This yields a limit of detection (LoD) that is used to optimize a BSW supporting thin film stack and to quantitatively compare SPR and BSW sensors. The results indicate that an order of magnitude reduction of the LoD is within reach when sufficient sampling of narrow BSW resonances is achieved.

Paper Details

Date Published: 15 May 2014
PDF: 9 pages
Proc. SPIE 9141, Optical Sensing and Detection III, 91410P (15 May 2014); doi: 10.1117/12.2052297
Show Author Affiliations
Riccardo Rizzo, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Univ. degli Studi di Roma La Sapienza (Italy)
Norbert Danz, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Francesco Michelotti, Univ. degli Studi di Roma La Sapienza (Italy)
Peter Munzert, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Alberto Sinibaldi, Univ. degli Studi di Roma La Sapienza (Italy)


Published in SPIE Proceedings Vol. 9141:
Optical Sensing and Detection III
Francis Berghmans; Anna G. Mignani; Piet De Moor, Editor(s)

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