E. coli bacteria Detection O157:H7 Using Si3N4 based Nano Biosensors

There are different methods to identify bacteria. One of the ways of identification is the use of nano bio sensors. Recently, these nano bio sensors have been widely used due to their non-invasive and rapid detection. The silicon nitride-based bio sensor, which is designed based on dielectric materials, has a very high sensitivity in detecting bacteria. In this paper, we have used nano bio sensor based on silicon nitride grating to detect Escherichia coli serotype O157:H7. The simulations show that the electromagnetic wave reflection spectrum in the proposed structure has a very narrow width of 6nm, and the measured FOM (Figure of Merit) and sensitivity of this bio sensor when exposed to this bacterium are 17.5RIU-1 and 105nm/RIU has been obtained, respectively, which shows the high accuracy and sensitivity of this bio sensor. This sensor can be used to detect bacteria whose refractive index is within the range of this bacteria.