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Laser Optics & Photonics and Atomic & Plasma Science 2018
J u l y 1 6 - 1 7 , 2 0 1 8
P r a g u e , C z e c h R e p u b l i c
Page 79
American Journal of Computer Science and Information Technology
ISSN: 2349-3917
E u r o S c i C o n J o i n t E v e n t o n
Laser Optics & Photonics and
Atomic & Plasma Science
A
fiber-optic volatile liquid sensor has been introduced utilizing localized surface plasmon resonance (LSPR) technique. The
unclad portion of a U-bent multimode fiber has been modified through deposition of colloidal nanoparticle layer on to the
exposed portion which has been used as the sensing probe. Interaction of noble metal nanoparticles (Ag and Au) and evanescent
wave field at the sensing region lead to excite the localized surface plasmons (LSPs) that affect the resonance condition and
thereby helps to detect the changes. The vapours of the proposed VLs (viz. acetone, methanol, ethanol and propanol) interacts
with the electric field of the plasmons at different concentration of VLs causing a progressive change in resonance conditions
of the localized plasmons which eventually modulate the output light signal of the fiber. The modulated light signal falls on a
photo-detector at the output end of the fiber and consequently registers the change in voltage response. Using both Ag and Au
nanoparticle coating on the unclad portion of the fiber, the consistency of the designed optical sensor has been investigated.
The response sensitivity for silver NPs coated probe is found to be more uniform than that of gold NPs coated probe. In addition
to that, as a proof of concept, the sensitivity, working domain, limit of detection (LOD) as well as repeatability test has been
evaluated for each set of VLs. The novelty of the proposed sensor lies in its inexpensive and simple optics design, miniaturized
optical set-up and quick response towards the analyte concentration
dmppaul22@gmail.comLow cost U-bent optical fiber volatile liquid
sensor based on localized surface plasmon
resonance (LSPR) technique
D Paul A, S Dutta B, D Saha C and R Biswas D
Tezpur University, India
Am J Compt Sci Inform Technol 2018, Volume 6
DOI: 10.21767/2349-3917-C1-003