Investigation of Glucose Sensor by using Plasmonic MIM Waveguide Based M

Abstract

This paper presents the utilization of metalinsulator- metal (MIM) plasmonic waveguide based Mach- Zehnder interferometer (MZI) for the artificial enzymatic detection of glucose concentration in blood and urine. The output of MZI model is attained by utilizing the concept of constructive interference at the output port. The outer side of sensing arm of MZI is facilitated with 10 nm thick layer of gold nanoparticles (AuNPs) to improve the sensitivity. Further, the specificity of sensing arm towards glucose molecules is enhanced by coating a layer of glucose oxidase (GOx). The sensing analysis of sensor model is done by testing it in the presence of glucose RI ranging from 1.335 – 1.339 (in blood) and 1.335 – 1.341 (in urine). The results states that the proposed sensor structure is capable to sense the presence of glucose concentration with autocorrelation coefficient and sensitivity of 99.7 % and 989.6 nm/RIU respectively. The complete analysis of proposed sensor model is carried out in the wavelength range from 1490 – 1610 nm under perfect matched layers (PML) as boundary conditions by using finite difference time domain (FDTD) method.