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. 2014 Oct 9;14(10):18701-10.
doi: 10.3390/s141018701.

Optical fiber sensor based on localized surface plasmon resonance using silver nanoparticles photodeposited on the optical fiber end

J Gabriel Ortega-Mendoza  1 , Alfonso Padilla-Vivanco  2 , Carina Toxqui-Quitl  3 , Placido Zaca-Morán  4 , David Villegas-Hernández  5 , Fernando Chávez  6
Affiliations

Optical fiber sensor based on localized surface plasmon resonance using silver nanoparticles photodeposited on the optical fiber end

J Gabriel Ortega-Mendoza et al. Sensors (Basel). .

Abstract

This paper reports the implementation of an optical fiber sensor to measure the refractive index in aqueous media based on localized surface plasmon resonance (LSPR). We have used a novel technique known as photodeposition to immobilize silver nanoparticles on the optical fiber end. This technique has a simple instrumentation, involves laser light via an optical fiber and silver nanoparticles suspended in an aqueous medium. The optical sensor was assembled using a tungsten lamp as white light, a spectrometer, and an optical fiber with silver nanoparticles. The response of this sensor is such that the LSPR peak wavelength is linearly shifted to longer wavelengths as the refractive index is increased, showing a sensitivity of 67.6 nm/RIU. Experimental results are presented.

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Figures

Figure 1.
Figure 1.
Experimental setup for photodepositing silver nanoparticles on the optical fiber end.
Figure 2.
Figure 2.
Experimental setup for measuring the refractive index of an aqueous medium.
Figure 3.
Figure 3.
Absorbance spectra of seed and colloidal solution.
Figure 4.
Figure 4.
Image of the optical fiber end obtained with SEM.
Figure 5.
Figure 5.
Sensor response based on LSPR localized in air. (a) The nanoparticles were photodeposited on the optical fiber end with the same conditions; (b) Sensor response before and after hitting the optical fiber.
Figure 6.
Figure 6.
(a) Sensor response localized in air, deionized water, ethanol, and clove oil; (b) LSPR peak wavelength as a function of the refractive index.
See this image and copyright information in PMC

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