Thin metal bilayer for surface plasmon resonance sensors in a multimode plastic optical fiber: the case of palladium and gold metal films

Nunzio Cennamo; Paola Zuppella; Davide Bacco; Alain J. Corso; Maria G. Pelizzo; Maria Pesavento; Luigi Zeni

doi:10.1117/12.2236607

30 May 2016 Thin metal bilayer for surface plasmon resonance sensors in a multimode plastic optical fiber: the case of palladium and gold metal films

Nunzio Cennamo, Paola Zuppella, Davide Bacco, Alain J. Corso, Maria G. Pelizzo, Maria Pesavento, Luigi Zeni

Author Affiliations +

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99161B (2016) https://doi.org/10.1117/12.2236607
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

Abstract

A novel sensing platform based on thin metal bilayer for surface plasmon resonance (SPR) in a D–shaped plastic optical fiber (POF) has been designed, implemented and tested. The experimental results are congruent with the numerical studies. This platform has been properly optimized to work in the 1.38 -1.42 refractive index range and it exhibits excellent sensitivity. This refractive index range is very interesting for bio-chemical applications, where the polymer layer are used as receptors (e.g. molecularly imprinted polymer) or to immobilize the bio-receptor on the metal surface. The proposed metallic bilayer is based on palladium and gold films and replaces the traditional gold by exhibiting higher performances. Furthermore, the deposition of the thin bilayer is a single process and no further manufacturing step is required. In fact, in this case the photoresist buffer layer between the POF core and the metal layer, usually required to increase the refractive index range, is no longer necessary.

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Nunzio Cennamo, Paola Zuppella, Davide Bacco, Alain J. Corso, Maria G. Pelizzo, Maria Pesavento, and Luigi Zeni "Thin metal bilayer for surface plasmon resonance sensors in a multimode plastic optical fiber: the case of palladium and gold metal films", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99161B (30 May 2016); https://doi.org/10.1117/12.2236607

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