Optimized Hexagonal Photonic Crystal Fibre Sensor for Glucose Sensing

Abstract

Aims: This paper presents an optimised hexagonal photonic crystal fibre (PCF) geometry for investigation of relative sensitivities for 20%, 30%, 40%, 50% and 60% of glucose solution in water at a wavelength ranging from 1200 nm to 1600 nm. This work also shows an active area and confinement loss variation of the optimised hexagonal PCF when the core is filled with different concentrations of glucose solution. Study Design:  Here, optimised hexagonal photonic crystal fiber (PCF) geometry is chosen where COMSOL Multiphysics software is used for simulation. Place and Duration of Study: Department of Electronics and Communication Engineering at Khulna University, Khulna-9208, Bangladesh and Study duration was between March 2017 and December 2017. Methodology: At first, 20%, 30%, 40%, 50% and 60% of glucose solution in water with different refractive indexes are inserted through the core of the modified Hexagonal PCF. Then, the simulation is done by varying wavelength from 1200 nm to 1600 nm. Here, Comsol Multiphysics is used for simulation and MATLAB is used to plot the desired optical properties of the proposed PCF geometry. Results: From this work, the relative sensitivities are obtained approximately 28.6, 33.09, 36.97, 40.37, 44.81 in percentage at wavelength 1200 nm and 35.27, 37.63, 41.15, 44.98, 47.87 in percentage at wavelength 1600 nm for 20%, 30%, 40%, 50% and 60% of glucose solution in water respectively. Again, the effective areas are found approximately 16.306 μm2, 17.285 μm2, 18.207 μm2, 19.209 μm2, 19.729 μm2 at wavelength 1200 nm and 18.823 μm2, 19.495 μm2, 20.21 μm2, 20.739 μm2, 20.954 μm2 at wavelength 1600 nm for 20%, 30%, 40%, 50% and 60% of glucose solution in water respectively. The confinement losses are approximately 2.1×10-8 dB/Km, 0.78×10-8 dB/Km, 0.15×10-8 dB/Km for 20%, 30%, and 40% of glucose solution in water respectively at wavelength 1500 nm but for 50% and 60% of glucose solution, the confinement loss is approximately zero from 1200 nm to 1600 nm. Conclusion: High sensitive Glucose sensor is achieved with optimised Hexagonal PCF structure which was the main target of this research.