Detection of biological contamination protozoa in drinking water using surface plasmon resonance-based technique

Water is one of the fundamental needs for human life on earth. Different kinds of contaminants that exist in the drinking water may cause serious health issues, affect body organs, or may cause mortality. One of the main sources of biological contaminants in the water is protozoan parasites, which are normally transmitted through the oral-fecal route. Two frequently water born protozoan parasites are C. parvum and G. lamblia. Both of these parasites have different values of refractive index and size. Using these biophysical parameters, the new detection system may be developed for real-time and on-site measurement. In this paper surface plasmon resonance (SPR) technique is utilized for theoretical investigation of biological contamination protozoa in drinking. Based on angle interrogation, the Kretschmann configuration is used to elaborate the concept of the setup. The performance is analysed on the basis of incident light wavelength in visible region and radiative properties of a multi-layered structure are studied using the transfer Metrix method.