Design of Fiber-Tip Refractive Index Sensor Based on Resonant Waveguide Grating with Enhanced Peak Intensity
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 R...
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MDPI AG
2021-07-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/15/6737 |
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| author | Yicun Yao Yanru Xie Nan-Kuang Chen Ivonne Pfalzgraf Sergiy Suntsov Detlef Kip Yingying Ren |
| author_facet | Yicun Yao Yanru Xie Nan-Kuang Chen Ivonne Pfalzgraf Sergiy Suntsov Detlef Kip Yingying Ren |
| author_sort | Yicun Yao |
| collection | DOAJ |
| description | 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 limited 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. |
| first_indexed | 2024-03-10T09:19:39Z |
| format | Article |
| id | doaj.art-44ab7fb7e89241bea2a9cedc887b0c23 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T09:19:39Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-44ab7fb7e89241bea2a9cedc887b0c232023-11-22T05:18:45ZengMDPI AGApplied Sciences2076-34172021-07-011115673710.3390/app11156737Design of Fiber-Tip Refractive Index Sensor Based on Resonant Waveguide Grating with Enhanced Peak IntensityYicun Yao0Yanru Xie1Nan-Kuang Chen2Ivonne Pfalzgraf3Sergiy Suntsov4Detlef Kip5Yingying Ren6School of Physical Science and Information Technology, Liaocheng University, Liaocheng 252059, ChinaSchool of Physical Science and Information Technology, Liaocheng University, Liaocheng 252059, ChinaSchool of Physical Science and Information Technology, Liaocheng University, Liaocheng 252059, ChinaFaculty of Electrical Engineering, Helmut Schmidt University, 22043 Hamburg, GermanyFaculty of Electrical Engineering, Helmut Schmidt University, 22043 Hamburg, GermanyFaculty of Electrical Engineering, Helmut Schmidt University, 22043 Hamburg, GermanyShandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, ChinaResonant 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 limited 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.https://www.mdpi.com/2076-3417/11/15/6737resonant waveguide gratingfiber sensorF-P cavity |
| spellingShingle | Yicun Yao Yanru Xie Nan-Kuang Chen Ivonne Pfalzgraf Sergiy Suntsov Detlef Kip Yingying Ren Design of Fiber-Tip Refractive Index Sensor Based on Resonant Waveguide Grating with Enhanced Peak Intensity Applied Sciences resonant waveguide grating fiber sensor F-P cavity |
| title | Design of Fiber-Tip Refractive Index Sensor Based on Resonant Waveguide Grating with Enhanced Peak Intensity |
| title_full | Design of Fiber-Tip Refractive Index Sensor Based on Resonant Waveguide Grating with Enhanced Peak Intensity |
| title_fullStr | Design of Fiber-Tip Refractive Index Sensor Based on Resonant Waveguide Grating with Enhanced Peak Intensity |
| title_full_unstemmed | Design of Fiber-Tip Refractive Index Sensor Based on Resonant Waveguide Grating with Enhanced Peak Intensity |
| title_short | Design of Fiber-Tip Refractive Index Sensor Based on Resonant Waveguide Grating with Enhanced Peak Intensity |
| title_sort | design of fiber tip refractive index sensor based on resonant waveguide grating with enhanced peak intensity |
| topic | resonant waveguide grating fiber sensor F-P cavity |
| url | https://www.mdpi.com/2076-3417/11/15/6737 |
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