Análise e projeto de sensor de índice de refração nanoplasmônico baseado em fibra D

Abstract

This project presents a proposal for the study of plasmonic sensors based on D-shaped optical fibers. A D-shaped fiber is a device crafted by polishing an optical fiber to a certain distance towards its center. With the polishing, a flat face is made, which can be functionalized with different films or gratings made of different materials. Considering functionalization with conductive materials, these sensors take advantage of the surface plasmon polaritons phenomenon, which are collective oscillations of free electron gas present at the dielectric-metal interface. Plasmonic sensors offer several advantages over conventional sensors, such as high sensitivity and the ability to concentrate the electromagnetic field in small regions. These sensors can also be fabricated on a reduced scale, making it possible to use them in wearables and implants. They can be applied in biology and chemistry, as many of them can measure substances concentrations in real-time. The aim of this project is to study, through simulation, different geometry and materials of plasmonic sensors based on D-shaped optical fibers, propose new sensors, and explore possibilities for improving existing sensors in literature.