High-Sensitivity Sensor for Sucrose Detection with Asymmetric Elliptical Core and Gold Coating

This work presents for a new exposed core surface plasmon resonance (SPR) biosensor that makes use of a photonic crystal fiber with an asymmetrical elliptic air hole (PCF), which is renowned for its exceptional sensibility. The gold-plated fiber of this versatile sensor enables it to detect changes in refractive index (RI) for analytes over a wide range of 1.28 to 1.42. Specifically focusing on RI changes at the external surface, the sensor demonstrates impressive sensing performance, including an prime wavelength sensitivity regarding 97,000 nm/RIU as well as a prime amplitude sensitivity regarding 529.20 RIU<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup>. Additionally, it achieves the resolution regarding <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{9.09}\times \mathbf{10}^{-\mathbf{6}}$</tex> RIU, the FOM is 170 RIU<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup>, the FWHM is also 570 nm, and here a detection of accuracy is 0.016666nm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup>. Utilizing a concentration range of 0% to 45% over time, the suggested sensor is useful for monitoring sucrose solutions. Beyond sucrose, the sensor demonstrates promising sensing capabilities for identifying various biochemical and organic samples, making it a valuable tool in biomedical sensing, lower RI analysis, and chemical analysis. Its structure, featuring eight elliptical air holes, is straightforward and easily manufacturable using existing technologies, thus facilitating practical application.