Modelling and performance analysis of a plasmonic biosensor comprising of silicon and chalcogenide materials for detecting refractive index variations of hemoglobin in near infrared

A plasmonic biosensor comprising of prism as a light coupling material, gold (Au) as a plasmon supporting metal and oxygenated native hemoglobin (Hb) solution as a bio sample operating under attenuated total reflection (ATR) mode has been modelled using the admittance loci method for detecting wavelength and concentration dependent refractive index (RI) variations of oxygenated native Hb solution for 700 nm to 900 nm wavelength in near infrared (NIR). Silicon (Si) and chalcogenide (2S2G) as high refractive index light coupling prism materials have been used in order to investigate their plasmonic biosensing performance in near infrared. The performance issues of the concerned plasmonic biosensor have also been discussed in terms of sensing parameters such as dynamic range, sensitivity, Full Width Half Maximum (FWHM).