Author Affiliations
1State Key Laboratory of Dynamic Testing Technology, North University of China, Taiyuan, Shanxi 0 30051, China2Beijing Institute of Aerospace Engineering, Beijing 100076, Chinashow less
Fig. 1. Schematic diagrams of structure and polishing cross-section of four-pole suspended core fiber. (a) Complete structure of fiber; (b) polishing cross section of one hole; (c) polishing cross section of two opposite holes; (d) polishing cross section of two adjacent holes
Fig. 2. Distributions of optical field E when liquid refractive index is 1.39. (a) x polarization (650 nm); (b) x polarization (720 nm); (c) x polarization (800 nm); (d) y polarization (650 nm); (e) y polarization (720nm); (f) y polarization (800 nm)
Fig. 3. When analyte refractive index neff is 1.39, relationship among loss spectrum of core mode, effective refractive index of core mode, and effective refractive index of SPP mode
Fig. 4. Sensing characteristics when polishing one air hole. (a) Spectral loss corresponding to refractive indexes of different analytes; (b) relationship between refractive index and resonance wavelength
Fig. 5. Sensing characteristics when polishing two opposite air holes. (a) Spectral loss corresponding to refractive indexes of different analytes; (b) relationship between refractive index and resonance wavelength
Fig. 6. Sensing characteristics when polishing two adjacent air holes. (a) Spectral loss corresponding to refractive indexes of different analytes; (b) relationship between refractive index and resonance wavelength
Fig. 7. Influences of structural parameters on sensing characteristics when polishing one air hole. (a) Spectral loss under different gold film thicknesses;(b) spectral loss under different suspension pole thicknesses
Fig. 8. Influences of structural parameters on sensing characteristics when polishing two opposite air holes. (a) Spectral loss under different gold film thicknesses; (b) spectral loss under different suspension pole thicknesses
Fig. 9. Influences of structural parameters on sensing characteristics when polishing two adjacent air holes. (a) Spectral loss under different gold film thicknesses; (b) spectral loss under different suspension pole thicknesses
Parameter | Value | Parameter | Value |
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ε∞ | 5.9673 | ΩL /THz | 2π×650.07 | ωD /THz | 2π×2113.6 | ΓL /THz | 2π×104.86 | γD /THz | 2π×15.92 | Δε | 1.09 |
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Table 1. Definition of each parameter value in Drude-Lorentz model
Refractive index | Wavelength /nm | Sensitivity /(nm·RIU-1) | Resolution /(10-4 RIU) | Refractive index | Wavelength /nm | Sensitivity /(nm·RIU-1) | Resolution /(10-5 RIU) |
---|
1.31 | 574 | 900 | 1.10 | 1.37 | 660 | 2400 | 4.20 | 1.32 | 583 | 1000 | 1.00 | 1.38 | 684 | 3200 | 3.10 | 1.33 | 593 | 1300 | 0.77 | 1.39 | 716 | 4400 | 2.30 | 1.34 | 606 | 1500 | 0.67 | 1.40 | 760 | 6000 | 1.70 | 1.35 | 621 | 1700 | 0.59 | 1.41 | 820 | 9000 | 1.10 | 1.36 | 638 | 2200 | 0.45 | 1.42 | 910 | 15000 | 0.67 |
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Table 2. Numerical analysis results when polishing one air hole
Refractive index | Wavelength /nm | Sensitivity /(nm·RIU-1) | Resolution /(10-4 RIU) | Refractive index | Wavelength /nm | Sensitivity /(nm·RIU-1) | Resolution /(10-5 RIU) |
---|
1.31 | 570 | 1000 | 1.00 | 1.37 | 660 | 2000 | 5.00 | 1.32 | 580 | 1000 | 1.00 | 1.38 | 680 | 4000 | 2.50 | 1.33 | 590 | 1500 | 0.67 | 1.39 | 720 | 4000 | 2.50 | 1.34 | 605 | 1500 | 0.67 | 1.40 | 760 | 7000 | 1.40 | 1.35 | 620 | 2000 | 0.50 | 1.41 | 830 | 10000 | 1.00 | 1.36 | 640 | 2000 | 0.50 | 1.42 | 930 | 16000 | 0.63 |
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Table 3. Numerical analysis results when polishing two opposite air holes
Refractive index | Wavelength /nm | Sensitivity /(nm·RIU-1) | Resolution /(10-4 RIU) | Refractive index | Wavelength /nm | Sensitivity /(nm·RIU-1) | Resolution /(10-5RIU) |
---|
1.31 | 590 | 1000 | 1.0 | 1.36 | 670 | 3000 | 3.30 | 1.32 | 600 | 1000 | 1.0 | 1.37 | 700 | 4000 | 2.50 | 1.33 | 610 | 2000 | 0.5 | 1.38 | 740 | 6000 | 1.70 | 1.34 | 630 | 2000 | 0.5 | 1.39 | 800 | 10000 | 1.00 | 1.35 | 650 | 2000 | 0.5 | 1.40 | 900 | 20000 | 0.50 |
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Table 4. Numerical analysis results when polishing two adjacent air holes
Characteristic | Wavelength /μm | Range of refractive index | Maximum spectral sensitivity /(nm·RIU-1) | Maximum resolution /RIU |
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Quasi-D-shape[6] | 550—740 | 1.33—1.42 | 3877 | | Double loss peaks[7] | | 1.34—1.38 | 18900 | 5.291×10-6 | Exposed-core grapefruit fiber and Bimetallic structure[8] | | 1.33—1.42 | 16400 | | Four-hole grapefruit fiber[9] | 600—1200 | 1.33—1.43 | 19000 | | Our work | 570—930 | 1.31—1.42 | 20000 | 5.0×10-6 |
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Table 5. Performance comparison of sensors that have been reported