Indian Journal of Pure and Applied Physics

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A Compact High Sensitive D Shape Surface Plasmon Sensor


Affiliations
1 School of Electronics Engineering, Vellore Institute of Technology, Vellore 632 014, India
2 Department of Physics, School of Advance d Scienc es,V el lor e Institute of T e chnology, V el lor e, 632 014, India

In this paper, we numerically design a refractive index-based surface plasmon fiber sensor by exploiting the optical characteristics of a commercially available side polished D-shaped photonic crystal fiber (PCF) using finite element method. The proposed sensor could work in the infrared regime for a wide range of analytes with refractive indices ranging from 1.33 to 1.36. The proposed sensor exhibits a maximum sensitivity of 31,800 nm/RIU with a resolution of 3.14×10-6 RIU when the refractive index is varied from 1.355 to 1.36. Further, considering the practical implementation, we carry out the fabrication tolerance of ± 5% of the proposed sensor by varying the optimized structural parameters. Based on the numerical results, we find that the proposed sensor is highly robust against the variations in the structural parameters. As the proposed fiber sensor has a strong surface plasmon resonance between the core mode and the surface plasmon mode, it is highly sensitive even for a minimum change in the refractive index of the analyte which is an attribute of high preference in biosensors.
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  • A Compact High Sensitive D Shape Surface Plasmon Sensor

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Authors

S Nivedha
School of Electronics Engineering, Vellore Institute of Technology, Vellore 632 014, India
K Senthilnathan
Department of Physics, School of Advance d Scienc es,V el lor e Institute of T e chnology, V el lor e, 632 014, India

Abstract


In this paper, we numerically design a refractive index-based surface plasmon fiber sensor by exploiting the optical characteristics of a commercially available side polished D-shaped photonic crystal fiber (PCF) using finite element method. The proposed sensor could work in the infrared regime for a wide range of analytes with refractive indices ranging from 1.33 to 1.36. The proposed sensor exhibits a maximum sensitivity of 31,800 nm/RIU with a resolution of 3.14×10-6 RIU when the refractive index is varied from 1.355 to 1.36. Further, considering the practical implementation, we carry out the fabrication tolerance of ± 5% of the proposed sensor by varying the optimized structural parameters. Based on the numerical results, we find that the proposed sensor is highly robust against the variations in the structural parameters. As the proposed fiber sensor has a strong surface plasmon resonance between the core mode and the surface plasmon mode, it is highly sensitive even for a minimum change in the refractive index of the analyte which is an attribute of high preference in biosensors.