Acta Photonica Sinica, Volume. 54, Issue 4, 0406002(2025)
Highly Sensitive Refractive Index Sensor Based on Hybrid Optical Waveguide Field Enhancement
Figures & Tables(26)
Fig. 1. Schematic diagram of the SMF-PCF-SMF hybrid optical waveguide structure
Fig. 2. Optical field simulation of SMF-PCF-SMF hybrid optical waveguide with tapered PCF section
Fig. 3. Interference spectrum simulation of SMF-PCF-SMF hybrid optical waveguide
Fig. 4. Interference spectrum simulation of SMF-PCF-SMF hybrid optical waveguide with tapered PCF section（after compressing the cladding thickness）
Fig. 6. The schematic diagram of SMF-PCF-SMF structure after fiber cladding polishing treatment
Fig. 7. The microscope diagram after polishing after polishing different l SMF-PCF-SMF structures
Fig. 8. The microscope diagram after HF acid etching cladding of SMF-PCF-SMF structure
Fig. 9. Structure diagram of SMF-PCF-SMF treated by fusion tapering
Fig. 10. The microscope diagram after tapering SMF-PCF-SMF structure
Fig. 11. Experimental setup of the RI sensor using SMF-PCF-SMF hybrid optical waveguide
Fig. 12. Interference spectrum of SMF-PCF-SMF hybrid optical waveguide structure
Fig. 14. Comparison of interference spectra before and after polishing different l SMF-PCF-SMF structures
Fig. 18. Comparison of interference spectra before and after HF acid etching cladding of SMF-PCF-SMF structure
Fig. 19. The test results of RI sensing for HF acid etched SMF-PCF-SMF structure
Fig. 20. Comparison of interference spectra before and after tapering
Fig. 21. The test results of RI sensing for PCF in the middle section of fused biconical tapering
Table 1. Polishing parameters of SMF-PCF-SMF with different l
View tableView in ArticleTable 1. Polishing parameters of SMF-PCF-SMF with different l
SMF-PCF-SMF l/μm Polishing length/mm 1 30.50 5 2 23.92 5 3 20.34 5
Table 2. ER comparison of SMF-PCF-SMF with different l before and after polishing
View tableView in ArticleTable 2. ER comparison of SMF-PCF-SMF with different l before and after polishing
SMF-PCF-SMF Before polishing ER/dB After polishing ER/dB ER variation/dB 1 7.39 1.61 -5.78 2 8.16 6.62 -1.54 3 9.64 8.35 -1.29
Table 3. RI sensitivity and R2 of SMF-PCF-SMF with different l
View tableView in ArticleTable 3. RI sensitivity and R2 of SMF-PCF-SMF with different l
SMF-PCF-SMF l/μm RI sensitivity/（nm · RIU-1） R2 No processing 0 59.14 0.84 1 30.50 56.93 0.90 2 23.92 56.33 0.95 3 20.34 54.74 0.99
Table 4. Comparison of RI sensitivity，R2 and ER of SMF-PCF-SMF with different fabrication methods
View tableView in ArticleTable 4. Comparison of RI sensitivity，R2 and ER of SMF-PCF-SMF with different fabrication methods
SMF-PCF-SMF RI sensitivity/（nm · RIU-1） R2 ER variation/dB No processing 59.14 0.84 - Polished structure 1 56.93 0.90 -5.78 Polished structure 2 56.33 0.95 -1.54 Polished structure 3 54.74 0.99 -1.29 HF acid corrosion 194.21 0.97 -2.09 Fusion tapering 1 405.36 0.99 2.07
Table 5. Sensitivity comparison of photonic crystal fiber sensors with different hybrid structures
View tableView in ArticleTable 5. Sensitivity comparison of photonic crystal fiber sensors with different hybrid structures
Structure RI sensitivity/（nm · RIU-1） Reference Splicing point biconical fiber based on SMF-PCF-SMF 260.8 ［ 17 ］PCF with half-taper collapse regions between two SMFs 181.96 ［ 18 ］PCF and SMF staggered core structure 102 ［ 19 ］Our work 1 405.36
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Zhengda LI, Hui LI, Chengzhao DENG, Xueying LIN, Yao LU, Ying XIAO, Hongdan WAN. Highly Sensitive Refractive Index Sensor Based on Hybrid Optical Waveguide Field Enhancement[J]. Acta Photonica Sinica, 2025, 54(4): 0406002
Paper Information
Category: Fiber Optics and Optical Communications
Received: Oct. 8, 2024
Accepted: Dec. 30, 2024
Published Online: May. 15, 2025
The Author Email: Hongdan WAN (hdwan@njupt.edu.cn)
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