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Interferometric and localized surface plasmon based fiber optic sensor

Muri, Harald Ian Di; Bano, Andon; Hjelme, Dag Roar
Journal article, Peer reviewed
Published version
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Permanent link
http://hdl.handle.net/11250/2479361
Issue date
2017
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  • Publikasjoner fra CRIStin - NTNU [15263]
  • Institutt for elektroniske systemer [1409]
Original version
10.1117/12.2250743
Abstract
We demonstrate a novel single point, multi-parameter, fiber optic sensor concept based on a combination of interferometric and plasmonic sensor modalities on an optical fiber end face. The sensor consists of a microFabry-Perot interferometer in the form of a hemispherical stimuli-responsive hydrogel with immobilized gold nanoparticles. We present results of proof-of-concept experiments demonstrating local surface plasmon resonance (LSPR) sensing of refractive index (RI) in the visible range and interferometric measurements of volumetric changes of the pH stimuli-responsive hydrogel in near infrared range. The response of LSPR to RI ( ∆λr ∆RI ∼ 877nm/RI) and the free spectral range (FSR) to pH ( ∆pH ∆FSR = 0.09624/nm) were measured with LSPR relatively constant for hydrogel swelling degree and FSR relatively constant for RI. We expect this novel sensor concept to be of great value for biosensors for medical applications.
Publisher
Society of Photo-optical Instrumentation Engineers (SPIE)
Journal
Proceedings of SPIE, the International Society for Optical Engineering

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