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U-bent polymer optical fiber (POF) for Escherichia coli detection

A. R. A. RASHID1,2,* , A. A. N. HAKIM1, N. YAHAYA3, A. H. SURANI1

Affiliation

  1. Applied Physics Programme, Faculty of Science and Technology, Universiti Sains Islam Malaysia, 71800, Nilai, Negeri Sembilan, Malaysia
  2. Frontier Materials Research Group (FMRG), Faculty of Science and Technology, Universiti Sains Islam Malaysia, 71800 Negeri Sembilan, Malaysia
  3. Food Biotechnology Programme, Faculty of Science and Technology, Universiti Sains Islam Malaysia, 71800, Nilai, Negeri Sembilan, Malaysia

Abstract

This research presents a plastic optical fiber (POF) based sensor to detect Escherichia coli at concentration of 103, 104, 105 and 106cfu/ml. The ESKA POF fiber composed of PMMA core and fluorinated polymer clad with refractive index of 1.49 and 1.41 respectively. Ethyl acetate solution was used to unclad 3 cm length of POF fibers and etched until 960 μm for all fiber sensors. U-shaped fiber with bending radius of 4 mm and 6 mm was developed by heating the fiber inside glass capillary tube. The penetration depth of the sensor is calculated by considering the internal and external curves of the U-shaped geometry. When tested with E. coli, fiber with bending radius of 4 mm shows a sensitivity of 9.5842 W/RIU with slope linearity more than 97.82 % while, 6 mm produce sensitivity of 0.0353 W/RIU with slope linearity 91.94 %. The performance of the sensor improved as the curvature radius decreased due to the light leaking and interact with the external medium. This can be concluded that by decreasing the bending radius, the penetration will be increased and thus affect the fiber’s sensitivity..

Keywords

Fiber optics, Biosensor, Evanescent wave, E. coli.

Citation

A. R. A. RASHID, A. A. N. HAKIM, N. YAHAYA, A. H. SURANI, U-bent polymer optical fiber (POF) for Escherichia coli detection, Optoelectronics and Advanced Materials - Rapid Communications, 14, 3-4, March-April 2020, pp.118-122 (2020).

Submitted at: April 12, 2019

Accepted at: April 9, 2020