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Proceedings Paper

Surface vs. bulk sensitivity of sensors based on Rayleigh anomalies in metallic nanogratings
Author(s): Armando Ricciardi; Silvio Savoia; Alessio Crescitelli; Emanuela Esposito; Vincenzo Galdi; Andrea Cusano
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Paper Abstract

This work provides numerical and experimental evidence that a significant difference exists between bulk and surface sensitivities in nanodevices based on Rayleigh anomalies (RAs) when employed for sensing the surrounding refractive index. In particular, recently proposed sensing schemes based on RAs in optical nanogratings are shown to be applicable only in the presence of bulk analytes. In the presence of thin overlays of analytes, instead, the (surface) sensitivity deteriorates up to two orders of magnitude by comparison with its bulk value, as well as with typical surface sensitivities exhibited by sensors based on surface plasmon resonances. This aspect is of fundamental importance as it severely limits the practical applicability of these devices to chemical and label-free biological sensing.

Paper Details

Date Published: 3 May 2013
PDF: 9 pages
Proc. SPIE 8774, Optical Sensors 2013, 87741V (3 May 2013); doi: 10.1117/12.2017233
Show Author Affiliations
Armando Ricciardi, Univ. degli Studi del Sannio (Italy)
Silvio Savoia, Univ. degli Studi del Sannio (Italy)
Alessio Crescitelli, Univ. degli Studi del Sannio (Italy)
CNR, Istituto di Cibernetica Eduardo Caianiello (Italy)
Emanuela Esposito, CNR, Istituto di Cibernetica Eduardo Caianiello (Italy)
Vincenzo Galdi, Univ. degli Studi del Sannio (Italy)
Andrea Cusano, Univ. degli Studi del Sannio (Italy)
CNR, Istituto di Cibernetica Eduardo Caianiello (Italy)

Published in SPIE Proceedings Vol. 8774:
Optical Sensors 2013
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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