Refractive Index Sensor with Double Resonance Peaks for D-Type Symmetric Two-Core Photonic Crystal Fiber

Gongli Xiao; Kaifu Zhang; Hongyan Yang; Yuting Yang; Xiuhua Yang; Wanying Dou; Lizhen Zeng

doi:10.3788/AOS202040.1206001

Acta Optica Sinica, Volume. 40, Issue 12, 1206001(2020)

Refractive Index Sensor with Double Resonance Peaks for D-Type Symmetric Two-Core Photonic Crystal Fiber

Gongli Xiao¹, Kaifu Zhang¹, Hongyan Yang^2,3、*, Yuting Yang¹, Xiuhua Yang¹, Wanying Dou¹, and Lizhen Zeng⁴

¹Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China

²Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China

³School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China

⁴Graduate School, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China

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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

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Fig. 2. Distribution of y-z cross sectional mode field when SPR effect occurring in sensor. (a) core 1; (b) core 2

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Fig. 3. Relative parameters of fiber when n_s being 1.40. (a) Dispersion relation and loss spectral curve; (b) electric field strength |E| distributions under different wavelengths

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Fig. 4. Influence of PCF structure parameters on loss spectral curves. (a) Λ; (b) d

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$Influence of gold film thickness on sensing performance of core 1. (a) Loss spectra under different gold film thicknesses; (b) relation between SPR wavelength and refractive index of analyte$

Fig. 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

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$Influence of gold nanometer column radius on sensing performance of core 2. (a) Loss spectra under different gold nanometer column radii; (b) relation between SPR wavelength and refractive index of analyte$

Fig. 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

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Fig. 7. Influence of gold nanometer column spacing on loss spectral curve

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$Analysis of sensor characteristics. (a)(b) Loss spectral curves corresponding to different refractive indexes of analyte; (c) relation between refractive index and resonance wavelength; (d) relation among refractive index, FWHM, and FOM$

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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Table 1. Parameters for Drude model fitting of Au dielectric permittivity^[24]
p Au(ε_∞=1.0,σ/ε'=1355.01)
A_p /eV B_p /eV² C_p /eV²
1 -8.577×10⁴ -1.156×10⁴ 5.557×10⁷
2 -2.875 0 2.079×10³
3 -997.600 -3090 6.921×10⁵
4 -1.630 -4.409 26.150

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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

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