Journal
OPTIK
Volume 139, Issue -, Pages 244-249Publisher
ELSEVIER GMBH
DOI: 10.1016/j.ijleo.2017.03.035
Keywords
Optical fiber sensor; Surface plasmon; Refractive index; Thin films; D-type fiber; Finite element method; Wire sensor
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Funding
- National Funds through the FCT - Fundacao para a Ciencia e a Tecnologia (Portuguese Foundation for Science and Technology) [SFRH/BD/85068/2012, UID/EEA/50014/2013]
- ERDF - European Regional Development Fund through the Operational Programme for Competitiveness and Internationalisation - COMPETE Programme [POCI-01-0145-FEDER-006961]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/85068/2012] Funding Source: FCT
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We propose a refractive index sensor based on surface plasmon resonance (SPR) in a gold wire partially incrusted on the surface of a D-type fiber and in contact with the external medium for increased sensitivity and roughness. The sensor is studied using numerical simulations based on the finite element method (FEM) and is compared with a more conventional D-type fiber SPR where the wire is replaced with a gold film. The numerical work estimates the sensitivity and resolution for different analytic refractive indexes (RI) in the range of 1.30-1.40, for a sensor based on the wavelength interrogation method. The results indicate that the use of the gold wire provides a better sensitivity when compared with the gold film, while supporting multiple peaks in different wavelengths, each with distinct values of sensitivity and resolution. (C) 2017 Elsevier GmbH. All rights reserved.
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