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. 2020 Feb 13;20(4):1009. doi: 10.3390/s20041009

Figure 1.

Figure 1

(a) Schematic diagram of the proposed H-shaped photonic crystal fiber-based surface plasmon resonance (PCF-SPR) sensor; (b) cross-section of the SPR sensor; (c) experimental setup of the SPR sensor for refractive index (RI) detection.