Evaluation of gold layer configuration for plasmonic fiber grating biosensors

[en] Gold-coated fiber Bragg gratings (FBGs) are nowadays a mature technology for lab-on-fiber sensing based on surface plasmon resonance (SPR) excitation. Tilted FBGs bring valuable assets such as easy light injection, remote operation in very small volumes of analytes and immunity to temperature fluctuations. Different gold configurations have been reported to date, without considering their relative performances in terms of biochemical sensing. In this work, we experimentally study the impact of the gold coating on the cladding mode distribution in the tilted FBG amplitude spectrum and subsequently on its sensitivity to cytokeratins used as biomarkers for cancer diagnosis. Some relevant configurations of gold coatings are produced and tested, relying on both the sputtering and electroless plating (ELP)processes. The obtained results confirm that the coating thickness and its roughness drive the biosensing performances. The experimental limit of detection for cytokeratins 17 sensing reaches 14 fM for the most sensitive configurations.

Disciplines :

Biochemistry, biophysics & molecular biology

Author, co-author :

Caucheteur, Christophe ; Université de Mons > Faculté Polytechnique > Electromagnétisme et Télécommunications

Loyez, Médéric ; Université de Mons > Faculté des Sciences > Protéomie et Microbiologie

Gonzalez Vila, Alvaro ; Université de Mons > Faculté Polytechnique > Electromagnétisme et Télécommunications

Wattiez, Ruddy ; Université de Mons > Faculté des Sciences > Service de Protéomie et Microbiologie

Language :

English

Title :

Evaluation of gold layer configuration for plasmonic fiber grating biosensors

Publication date :

03 September 2018

Journal title :

Optics Express

Publisher :

Optical Society of America, United States - District of Columbia

Volume :

Issue :

Pages :

24154-24163

Peer reviewed :

Peer reviewed

Research unit :

S828 - Protéomie et Microbiologie
F108 - Electromagnétisme et Télécommunications

Research institute :

R100 - Institut des Biosciences

Available on ORBi UMONS :

since 31 August 2018

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