Analysis of a plasmonic based optical fiber optrode with phase interrogation

• DOI: 10.1007/s13320-016-0329-5
• Publication Date: 2016-06-20T11:14:15Z
• Authors: H. Moayyed; I. T. Leite; L. Coelho; J. L. Santos; D. Viegas
• Keywords: Optode

Abstract Optical fiber optrodes are attractive sensing devices due to their ability perform point measurement in remote locations. Mostly, they oriented biochemical sensing, quite often supported by fluorescent and spectroscopic techniques, but with the refractometric approach considered as well when objective is of high performance, particularly focus on enhancing measurand resolution. In this work, we address subject, proposing analyzing characteristics a optic optrode relying plasmonic interaction. A linearly tapered optical tip covered double overlay: inner one–a silver thin film over it–a dielectric layer, combination allowing achieve, at specific wavelength range, surface resonance (SPR) interaction sensitive refractive index surrounding medium. Typically, interrogation SPR structures performed, considering principle, far better performance can be obtained, reading phase light located within spectral resonance. This which studied here context proposed configuration. The analysis performed shows layer titanium oxide tuned thicknesses enables allows operation sensor third telecommunication window.