FIBER OPTIC EVANESCENT WAVE BIOSENSOR

Abstract

Biosensors are analytical devices that can detect chemical or biological species or a microorganism. A biosensor utilizes a biological recognition element that senses the presence of an analyte ie; the species to be detected and creates a physical or chemical response that is converted by a transducer to a signal. Biosensors can be used in clinical diagnostics, drug development, environmental monitoring air, water, soil and food quality control. Fiber Optic Biosensors (FOBS) are optical fiber derived devices which use optical field to measure biological species. Because of their chemical inertness, their compatibility to a wide range of surface modification, the potential for remote sensing, efficiency, accuracy, low cost, and the ready availability of inexpensive lasers and photodetectors, FOBS are promising alternatives to traditional methods for biomolecule measurements. One reliable and sensitive optical method is evanescent sensing. A sensor based on evanescent field absorption relies on the interaction of a target substance with the evanescent field adjacent to the fibre core. Removing the cladding from a portion of an optical fibre permits the evanescent field to interact with the substances in‐which the fibre is immersed. The objective of this project work is to develop a Fiber Optic Biosensor based on evanescent wave to detect the microorganisms such as Yeast molecule and to evaluate their activity in the presence of Curcumin and Neera.