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Home > Archives > Volume 20, No 8 (2022) > Article

DOI: 10.14704/nq.2022.20.8.NQ44781

Optimum Design to Get the Best Sensitivity of U shape Localize Surface Plasmon Resonance Sensor

Saffana Z. Maseer, Bushra R. Mahdi

Abstract

In this study, three sensors were synthesized in U shape by using plastic optical fiber and tested in two steps. Firstly, three sensors were tested without coating. They were manufactured using a plastic optical fiber, this optical fiber was bent in a U-shape, and then a part of the fiber clad was removed by polishing at the sensor head to become a D-shape. These sensors were bent with three different bending diameters (1, 0.7, and 0.5) cm to study the effect of bending diameter on the sensitivity of the sensor. These sensors were tested with sodium chloride solution with refractive indices ranging from 1.333 to 1.363, and it was noted that there was decreasing in Intensity of output light with increase concentration of solutions. Secondly, these three sensors were coated with 20nm layer of gold nanoparticles thickness. These sensors were tested with a solution of sodium chloride salt, and it was noted that there was a shift in wavelengths, and the largest shift in wavelengths was achieved by the sensor with a curvature diameter of 0.5 cm, where the shift in wavelength was 5.37nm and the sensitivity was 179nm/RIU. Thus, the sensor with bending diameter of 0.5 cm achieves the highest sensitivity, so it was chosen as an optimum bending diameter.

Keywords

plastic optical fiber, localize surface Plasmon Resonance, U bent fiber sensor.

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