Design and Performance Perspectives on Fiber Optic Sensors With Plasmonic Nanostructures and Gratings: A Review

This paper presents a sharp review of the current state-of-the-art related to the fiber optic sensors with (i) gratings (namely, fiber Bragg gratings, i.e., FBG and long period fiber gratings, i.e., LPG) and (ii) plasmonic nanostructures (metallic/non-metallic gratings, corrugations, and arrays). The objective of this review is to highlight the importance of these areas in terms of their high sensing performance and the great potential they possess for developing plasmonics-based fiber optic chemical and biosensors with even higher levels of performance in the future. In line with the above objectives, the selected salient works are revisited while beginning with the earliest works on general fiber SPR sensors as well as both the above-mentioned areas. In this process, the review makes a thoughtful attempt to spot the possible future scope and emergent themes in these research areas. The review will be able to provide adequate directives to the researchers willing to take up these areas as their future endeavors.