Abstract
In this paper we propose a gold-plated photonic crystal fiber (PCF) refractive index sensor based on surface plasmon resonance (SPR), in which gold is coated on the external surface of PCF for easy fabrication and practical detection. The finite element method (FEM) is used for the performance analysis, and the numerical results show that the thickness of the gold film, the refractive index of the analyte, the radius of the air hole in the first layer, the second layer, and the central air hole can affect the sensing properties of the sensor. By optimizing the sensor structure, the maximum wavelength sensitivity can reach 11000 nm/RIU and the maximum amplitude sensitivity can reach 641 RIU−1. Due to its high sensitivity, the proposed sensor can be used for practical biological and chemical sensing.
Highlights
Surface plasmon resonance (SPR) is a new technology that has experienced rapid development in recent decades
Due to its unique capabilities such as high sensitivity and usefulness in unlabeled detection [1], SPR has been widely used in fields such as biological analysis [2,3], food quality detection [4], and chemical and gas analysis [5,6]
We can modify air holes geometries or alter the number of rings to manage the light propagation, and a good evanescent field can be obtained in photonic crystal fiber (PCF)
Summary
Surface plasmon resonance (SPR) is a new technology that has experienced rapid development in recent decades. In 2014, Jitendra et al put a layer of metal on six liquid analyte channels [14], and its maximum wavelength sensitivity reached 2000 nm/RIU.
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