Si Chen, Jingzhi Wu, Yanhong Wang, Qiannan Wu. Design of Plasmonic Infrared Sensor Based on D-Shaped Photonic Crystal Fiber with Au-TiO2 Coating Grooves[J]. Laser & Optoelectronics Progress, 2023, 60(7): 0706006
- Laser & Optoelectronics Progress
- Vol. 60, Issue 7, 0706006 (2023)
Fig. 1. Schematic diagram of fiber optic sensor structure
Fig. 2. Mode dispersion characteristics and confinement loss when analyte refractive index na=1.26. (a) SPP mode at 2.45 µm; (b) core mode at 2.45 µm; (c) coupled mode at 2.56 µm
Fig. 3. Confinement losses at different TiO2 thicknesses
Fig. 4. Confinement losses under different conditions. (a) Different r1; (b) different r2; (c) different r3; (d) different adjacent stomatal spacing Λ
Fig. 5. Confinement losses under different conditions. (a) Different r4; (b) distance h from different sections to center of circle
Fig. 6. Confinement losses with different Au film thicknesses
Fig. 7. Sensing performance analysis. (a) Confinement losses for different analyte refractive indices; (b) fitting of resonance wavelength to corresponding refractive index
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