Title: Design of fiber‐tip refractive index sensor based on resonant waveguide grating with enhanced peak intensity
Authors: Yao, Yicun
Xie, Yanru
Chen, Nan Kuang
Pfalzgraf, Ivonne 
Suntsov, Sergiy 
Kip, Detlef  
Ren, Yingying
Language: en
Subject (DDC): DDC::500 Naturwissenschaften und Mathematik
Issue Date: 2021
Publisher: MDPI
Document Type: Article
Journal / Series / Working Paper (HSU): Applied Sciences : open access journal 
Volume: 11
Issue: 15
Publisher Place: Basel
Resonant waveguide gratings (RWG) are widely used as on‐chip refractometers due to their relatively high sensitivity to ambient refractive index changes, their possibility of parallel high-throughput detection and their easy fabrication. In the last two decades, efforts have been made to integrate RWG sensors onto fiber facets, although practical application is still hindered by the lim-ited resonant peak intensity caused by the low coupling efficiency between the reflected beam and the fiber mode. In this work, we propose a new compact RWG fiber‐optic sensor with an additional Fabry‐Pérot cavity, which is directly integrated onto the tip of a single‐mode fiber. By introducing such a resonant structure, a strongly enhanced peak reflectance and improved figure of merit are achieved, while, at the same time, the grating size can be greatly reduced, thus allowing for spatial multiplexing of many sensors on a tip of a single multi‐core fiber. This paves the way for the development of probe‐like reflective fiber‐tip RWG sensors, which are of great interest for multi‐channel biochemical sensing and for real‐time medical diagnostics.
Organization Units (connected with the publication): Experimentalphysik und Materialwissenschaften 
URL: https://api.elsevier.com/content/abstract/scopus_id/85111562697
ISSN: 2076-3417
DOI: 10.3390/app11156737
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