Experimental demonstration of a novel bio-sensing platform via plasmonic band gap formation in gold nano-patch arrays
Abstract
In this paper we discuss the possibility of implementing a novel bio-sensing platform based on the observation of the shift of the leaky surface plasmon mode that occurs at the edge of the plasmonic band gap of metal gratings, when an analyte is deposited on top of the metallic structure. We report numerical calculations, fabrication and experimental measurements to prove the sensing capability of a two-dimensional array of gold nano-patches in the detection of a small quantity of Isopropyl Alcohol (IPA) deposited on top of sensor surface. The calculated sensitivity of our device approaches a value of 1000 nm/RIU with a corresponding Figure of Merit (FOM) of 222 RIU−1. The presence of IPA can also be visually estimated by observing a color variation in the diffracted field. We show that color brightness and intensity variations can be ascribed to a change in the aperture size, keeping the periodicity constant, and to different types of analyte deposited on the sample, respectively. Moreover, we demonstrate that unavoidable fabrication imperfections revealed by the presence of rounded corners and surface roughness do not significantly affect device performance.
Autore Pugliese
Tutti gli autori
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M. Grande , M. A. Vincenti , T. Stomeo , G. Morea , R. Marani , V. Marrocco , Petruzzelli V. , A. D’Orazio , R. Cingolani , M. De Vittorio , D. de Ceglia , M. Scalora
Titolo volume/Rivista
OPTICS EXPRESS
Anno di pubblicazione
2011
ISSN
1094-4087
ISBN
Non Disponibile
Numero di citazioni Wos
Nessuna citazione
Ultimo Aggiornamento Citazioni
Non Disponibile
Numero di citazioni Scopus
27
Ultimo Aggiornamento Citazioni
2017-04-22 03:20:59
Settori ERC
Non Disponibile
Codici ASJC
Non Disponibile
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