Abstract
In this paper, a novel microstructure photonic crystal fiber (MC-PCF)-surface plasmon resonance sensor is presented and developed using the finite element method with perfectly matched layer boundary condition. The sensor performance in terms of wavelength sensitivity (WS), amplitude sensitivity (AS), and figure of merit (FoM) is quantitatively examined using an external sensing technique with an optimal thickness of 40 nm of chemically stable gold. Finer mesh analysis is also used for modal analysis. At this optimized gold thickness, the highest recorded WS of 92,000 nm per RIU and AS of 1080 per RIU at a detecting range of 1.33–1.38 RIU are obtained. Within this detecting range, the sensor also has a strong linear fit and a FoM of 348.15 per RIU, respectively. Because of its high sensitivity and FoM, the suggested sensor might be a viable competitor in detecting the analyte refractive index. Finally, to demonstrate the performance capability of our proposed sensor, all performance parameters were compared to previously published studies.
Highlights
The surface plasmon resonance (SPR) based microstructure photonic crystal fiber (MCPCF) sensors have become intensively research topic a days because of its simplicity, cost effective operation, high sensing ability, compactness, remote sensing capability, less fabrication complexity, high detecting range and high sensing accuracy (Rifat et al 2017)
The working methodology of the SPR-microstructure photonic crystal fiber (MC-PCF) sensor is based on the interaction between the incident light which is applied to the analyte/gold layer interface and metal thin film surface (Rifat et al 2017; Haque et al 2018)
When light is incident at the analyte/goad interface, the total internal reflectance has been occurred and generated a surface plasmon wave (SPW) which propagates along the gold layer surface (Hossain et al 2020c)
Summary
The surface plasmon resonance (SPR) based microstructure photonic crystal fiber (MCPCF) sensors have become intensively research topic a days because of its simplicity, cost effective operation, high sensing ability, compactness, remote sensing capability, less fabrication complexity, high detecting range and high sensing accuracy (Rifat et al 2017). The working methodology of the SPR-MC-PCF sensor is based on the interaction between the incident light which is applied to the analyte/gold layer interface and metal thin film surface (Rifat et al 2017; Haque et al 2018). B. Hossain, et al proposed a numerical analysis of gold coating based quasi D-shape dual core PCF SPR sensor which shows WS of 15,000 nm/RIU and AS of 230/RIU. Sakib et al in literature (Nazmus et al 2019), proposed a high-performance dual core D-shape PCF-SPR sensor modeling employing gold coat. Et al in literature (Biplob et al 2020) proposed a silver coated hollow-core PCF sensor was reported This sensor reduced fabrication difficulties but shows less WS of 21,000 nm per RIU. A novel very high sensitivity-based microstructure-based PCF-SPR sensor is proposed where optimized gold thickness as external sensing approach is utilized to improve sensor performance. The superior sensor performance has been ensured by utilizing the newly proposed model along with optimized gold thickness of 40 nm
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