Sensitive detection of E. Coli cells by long period gratings based optical sensor

We present a novel bacterial sensing platform based on long period gratings written in photosensitive single mode optical fiber by UV eximer laser (248 nm). Shift in wavelength with varied concentrations were observed in transmission spectrum. Significant wavelength shifts were noted for all dilutions with Outer Membrane Protein Complex (OMPC) antibody immobilized LPG sensing probe. A considerable shift of 0.55938 nm in wavelength is observed when 10−5 dilution (180 CFU/ ml) of E.Coli is passed over OMPC immobilized sensing probe.