Highly sensitive RI sensor based on a D-shaped single-mode-graded-index multimode-single-mode fiber structure

A novel refractive index (RI) sensor based on a D-shaped single-mode-graded-index multimode-single-mode fiber (D-SGIMS) structure is presented and investigated in detail. A CO 2 laser was used to process the SGIMS structure, which produced a strong evanescent field. The structural parameters were de...

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Published inApplied physics. B, Lasers and optics Vol. 129; no. 1
Main Authors Xiang, Zihang, Lu, Chupeng, Wang, Shengjia, Rui, Zeju, Zeng, Fei, Wang, Yifei, Sun, Cuiting, Jin, Xiren, Li, Song, Geng, Tao
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 2023
Springer Nature B.V
Subjects
Applied physics
Carbon dioxide
Carbon dioxide lasers
Engineering
Lasers
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Refractivity
Spectral sensitivity
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Summary:A novel refractive index (RI) sensor based on a D-shaped single-mode-graded-index multimode-single-mode fiber (D-SGIMS) structure is presented and investigated in detail. A CO 2 laser was used to process the SGIMS structure, which produced a strong evanescent field. The structural parameters were determined via simulations, and the experimental results were consistent with those of the theoretical analysis. The transmission spectra and RI sensitivity of the fabricated sensors with different lengths were compared via experiments, the results of which indicated that the maximum RI sensitivity was 811.00 nm/RIU in the range 1.333–1.419. Therefore, the proposed D-SGIMS structure can provide high-precision measurement capabilities and can be applied in the field of biochemistry.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-022-07967-9