Acta Optica Sinica, Volume. 45, Issue 16, 1628004(2025)
High-Sensitivity Triple Open-Loop Channel D-Type PCF-SPR Refractive Index Sensor
Figures & Tables(7)
Fig. 1. Structure of proposed PCF-SPR sensor and experimental devices. (a) Cross-section view; (b) schematic of 3D model; (c) experimental device
Fig. 2. Dispersion relationship between fundamental mode and SPP, and loss curve of fundamental mode
Fig. 3. Loss spectra of corresponding fundamental modes for different pore sizes. (a) d1; (b) d2; (c) d3
Fig. 4. Fundamental mode loss spectra under different parameters. (a) Different air-hole spacings Λ; (b) different gold film thicknesses tAu; (c) different open-loop radii rs; (d) different distances from core to polished surface h
Fig. 5. Relationship between fundamental mode loss spectra and resonant wavelength for RI from 1.15 to 1.29. (a) Fundamental mode loss spectra; (b) relationship between analyte RI and resonant wavelength
Table 1. Sensor performance of analyte for refractive index between 1.15 and 1.29
View tableTable 1. Sensor performance of analyte for refractive index between 1.15 and 1.29
Analyte RI Peak loss /（dB/cm） Resonance wavelength /nm Resonance
peak shift /nm
Wavelength sensitivity /（nm/RIU） Resolution /RIU FOM /RIU-1 1.15 260.29 2352 7 700 1.43×10-4 6.97 1.16 264.44 2359 7 700 1.43×10-4 6.99 1.17 269.09 2367 8 800 1.25×10-4 8.13 1.18 274.43 2375 11 1100 9.09×10-5 11.47 1.19 280.59 2386 11 1100 9.09×10-5 11.53 1.20 287.80 2397 11 1100 9.09×10-5 12.60 1.21 296.34 2410 13 1300 7.69×10-5 15.60 1.22 306.82 2424 14 1400 7.14×10-5 16.77 1.23 320.10 2442 18 1800 5.56×10-5 22.21 1.24 337.98 2463 21 2100 4.76×10-5 28.72 1.25 364.96 2490 27 2700 3.70×10-5 38.88 1.26 411.91 2525 35 3500 2.86×10-5 60.22 1.27 424.70 2570 45 4500 2.22×10-5 62.52 1.28 435.46 2645 75 7500 1.33×10-5 98.93 1.29 437.00 2790 145 14500 6.90×10-6 114.94
Table 2. Comparison between PCF-SPR sensor designed in this work and reported PCF-SPR sensors
View tableTable 2. Comparison between PCF-SPR sensor designed in this work and reported PCF-SPR sensors
Ref. No Detection range Plasmonic material Wavelength sensitivity /（nm/RIU） Resolution /RIU FOM /RIU-1 Structure ［35］ 1.35‒1.50 Ag 3400 2.94×10-5 — ［36］ 1.32‒1.41 Au 9000 1.11×10-5 — ［42］ 1.20‒1.29 Au 11055 9.05×10-6 — ［43］ 1.33‒1.39 Au 5000 2.00×10-5 47 ［44］ 1.33‒1.40 Au 7000 1.43×10-5 94.97 ［45］ 1.20‒1.34 Au 10900 9.17×10-6 — This work 1.15‒1.29 Au 14500 6.90×10-6 114.94
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Xueqing He, Mingming Zhang. High-Sensitivity Triple Open-Loop Channel D-Type PCF-SPR Refractive Index Sensor[J]. Acta Optica Sinica, 2025, 45(16): 1628004
Paper Information
Category: Remote Sensing and Sensors
Received: Apr. 14, 2025
Accepted: May. 19, 2025
Published Online: Aug. 18, 2025
The Author Email: Xueqing He (hexq_1988@163.com)
CSTR:32393.14.AOS250908
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