Gongli Xiao, Kaifu Zhang, Hongyan Yang, Yuting Yang, Xiuhua Yang, Wanying Dou, Lizhen Zeng. Refractive Index Sensor with Double Resonance Peaks for D-Type Symmetric Two-Core Photonic Crystal Fiber[J]. Acta Optica Sinica, 2020, 40(12): 1206001
- Acta Optica Sinica
- Vol. 40, Issue 12, 1206001 (2020)
Fig. 1. Schematic of D-type symmetrical dual-core PCF sensor. (a) Drawing of three-dimensional structure; (b) drawing of two-dimensional structure and enlargement of its y-z section
Fig. 2. Distribution of y-z cross sectional mode field when SPR effect occurring in sensor. (a) core 1; (b) core 2
Fig. 3. Relative parameters of fiber when ns being 1.40. (a) Dispersion relation and loss spectral curve; (b) electric field strength |E| distributions under different wavelengths
Fig. 4. Influence of PCF structure parameters on loss spectral curves. (a) Λ; (b) d
Fig. 5. Influence of gold film thickness on sensing performance of core 1. (a) Loss spectra under different gold film thicknesses; (b) relation between SPR wavelength and refractive index of analyte
Fig. 6. Influence of gold nanometer column radius on sensing performance of core 2. (a) Loss spectra under different gold nanometer column radii; (b) relation between SPR wavelength and refractive index of analyte
Fig. 7. Influence of gold nanometer column spacing on loss spectral curve
Fig. 8. Analysis of sensor characteristics. (a)(b) Loss spectral curves corresponding to different refractive indexes of analyte; (c) relation between refractive index and resonance wavelength; (d) relation among refractive index, FWHM, and FOM
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Table 1. Parameters for Drude model fitting of Au dielectric permittivity[24]
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