Quality Enhancement of Fiber Optic Surface Plasmon Resonance Biosensor Consisting of Metal and Barium Titanate Layer by Using Aluminum Alloy in Medical Applications

Detection of water impurities is an important issue in many applications, especially in the medical field. In this paper, a fiber optic sensor based on surface plasmon resonance has been numerically simulated and is used for detecting 10% glucose (called dextrose 10%). This sensor consists of two layers, the first layer is metal such as cobalt, nickel, platinum, and silver and the second layer is barium titanate. The sensor performance parameters were calculated using the normalized transmitted power in three different values of 300, 600, and 900 microns of fiber core diameter. Ag/BaTiO3 with 900 microns fiber core is the most qualified structure. In the second part of the research, the effect of aluminum-silver alloy has been investigated to enhance the quality factor of Ag/BaTiO3. The combination ratio of Ag-Al (0.1:0.9) was the best choice to increase the quality factor of the sensor from 62.46 (RIU-1) to 88.0 (RIU-1).