Combined effect of Etched diameter and thickness of Reduced Graphene Oxide coating on the sensitivity of Fiber Bragg Grating sensors for DNA application

Etched Fiber Bragg Grating (eFBG) sensors find applications in various fields. Etching of sensors and coating of nano materials over them is a widely researched field. Etching of sensors to improve their sensitivity to the... [ view full abstract ]

Etched Fiber Bragg Grating (eFBG) sensors find applications in various fields. Etching of sensors and coating of nano materials over them is a widely researched field. Etching of sensors to improve their sensitivity to the surrounding environmental conditions by the interaction of evanescent waves have been studied extensively and many theoretical proofs have also been published . The electrical, mechanical, optical properties, etc. of the optical fibers have also been research topics from many years.

In this paper the combined effect of both the etching diameter of the Fiber Bragg Grating sensors and the thickness of reduced Graphene Oxide (rGO) coating have been studied with respect to one application of sensing i.e. DNA attachment. This is an important observation as it gives an insight into the requirement of the sensor; higher or lower etched diameters, thin or thick coating; these can be decided upon as per the application requirement. Optimization of the initial steps during sensor preparation can be reduced to a large extent with this data. The experimental results are also backed with simulation results using COMSOL Multi physics 5.2 ^® and characterized using Optical fluoroscope and Scanning Electron Microscope.