4.4 Article

Enhanced Sensitivity of Open Channel SPR-Based PCF Sensor Employing Plasmonic Materials for Analyte Sensing

Journal

PLASMONICS
Volume 17, Issue 5, Pages 2075-2087

Publisher

SPRINGER
DOI: 10.1007/s11468-022-01691-y

Keywords

Surface plasmon resonance; Plasmonic materials; Amplitude sensitivity; Confinement loss

Funding

  1. ICT Division of the Ministry of Posts, Telecommunications and Information Technology, Dhaka, Bangladesh

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This study focuses on highly sensitive photonic crystal fiber sensors based on surface plasmonic resonance, achieving significant sensitivity and wavelength sensitivity by incorporating plasmonic materials such as gold and titanium dioxide. By simplifying the geometry and utilizing air holes and pitch variation, the detection performance is optimized, showing promising progress in biological analysis.
Highly sensitive photonic crystal fiber (PCF) sensors based on the spectacle of surface plasmonic resonance (SPR) are analyzed numerically and demonstrated. The finite element method (FEM) technique is used to examine detection performance. This study, an SPR-based PCF structure, has been proposed which achieved a maximum amplitude sensitivity of 573.83 RIU-1 and wavelength sensitivity of 6000 nm/RIU at refractive index (RI) of 1.39. Plasmonic materials such as gold (Au) and titanium dioxide (TiO2) have been implied inside the open channels of the PCF as a thin layer. The study explores different types of effects of detecting variation of gold thickness. The work also uses the simple appearance of air holes and pitch variation to achieve the best level detection performance. Moreover, a simplified geometry of SPR-based PCF has been proposed to trim the complexity of the manufacturing process. With an improved sensitivity performance, the benefit of the sensor will also make promising progress towards the detection of unknown biological analyte.

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