Guangwei Fu, Chang Liu, Mengmei Wang, Bilin Wang, Ying Wang, Xinghu Fu, Wa Jin, Weihong Bi. Tapered Multimode Fiber Temperature Sensor Based on Surface Graphene Modification[J]. Acta Optica Sinica, 2021, 41(9): 0906002
- Acta Optica Sinica
- Vol. 41, Issue 9, 0906002 (2021)
Fig. 1. Refractive index change of graphene fiber with temperature and mode field distribution at different temperatures
Fig. 2. Temperature-loss curves under different beam waist diameters
Fig. 3. Temperature-loss curves under different graphene layers
Fig. 4. Graphene transfer process. (a) Copper foil with graphene on the surface; (b) dissolution of the copper foil; (c) graphene transferred to fiber
Fig. 5. Raman spectra of graphene under different cone lengths. (a) L=0 mm; (b) L=5 mm; (c) L=8 mm; (d) L=10 mm
Fig. 6. SEM image after transferring graphene
Fig. 7. Temperature sensing experiment system
Fig. 8. Spectra of TMMFs with different beam waist diameters without graphene modification as temperature increases. (a) d=9.95 μm; (b) d=12.87 μm; (c) d=16.20 μm; (d) d=125 μm
Fig. 9. SG-TMMF spectra with increasing temperature. (a) d=9.95 μm; (b) d=12.87 μm; (c) d=16.20 μm
Fig. 10. Temperature sensing experiment results of 12.87 μm experiment group
Fig. 11. Transmission loss of SG-TMMFs with different graphene lengths versus temperature. (a) l=2 mm; (b) l=4 mm; (c) l=5 mm; (d) l=8 mm
Fig. 12. Relationship curve between wavelength drift and temperature change
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Table 1. Temperature sensing sensitivity of TMMF sensor without graphene modification
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Table 2. Temperature sensing sensitivity of each SG-TMMF sensor
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Table 3. SG-TMMF structural parameters of each group
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Table 4. Sensor sensitivity at different graphene lengths
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