Design Analysis of Multisample Single-Analyte Surface Plasmon Resonance Biosensor Based on D-Shape Photonic Crystal Fibers

This paper dealt with the analysis of a surface plasmon resonance (SPR)-based D-shape photonic crystal fiber (PCF) biosensor for the detection of multimolecules present in a single analyte or simultaneous detection of more than one samples of an analyte. A spatially distributed metallic layer of two plasmonic metals is deposited on the outer flat surface of a D-shaped PCF. Two metals generate two resonance peaks which can detect more than one sample of analyte simultaneously. The analytes are floated onto the flat surface of D-shaped PCF. The mode analysis of proposed sensor is done using finite element method (FEM) with perfectly matched layer. In this study, it can be seen that spatially distributed bimetallic layers can detect more than one sample of analyte simultaneously. The different dimensions of spatially distributed bimetallic SPR-based D-shape PCF sensor are also optimized with respect to center hole diameter, first air hole ring diameter, metal layer thickness and the depth of D-shape. It is also observed that the two SPR wavelengths can be controlled slightly by varying these parameters. It has been seen that for some optimal set of dimensions with the same sensitivity, the confinement loss of the plasmonic peaks is higher. This property may be useful in the applications, where one can sense more than two molecules or more than two samples for the single analyte.

Automated summary

This study discusses the analysis of a surface plasmon resonance (SPR)-based D-shape photonic crystal fiber (PCF) biosensor for the detection of multimolecules present in a single analyte or simultaneous detection of more than one samples of an analyte. By optimizing the dimensions of the sensor, it is possible to control the wavelengths of the two SPR peaks, and for some optimal set of dimensions, although the sensitivity is the same, the confinement loss of the plasmonic peaks is higher, which may be useful in certain biosensor applications.