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- Title
D-Shaped Microfluidic Channel Bimetallic with a Highly Sensitive SPR RI Sensor for a Large Detection Range.
- Authors
Kadhim, Riadh A.; Salih, Qaidar Mohammed; Hasan, Ashraf Dhannon; Alkhasraji, Jafaar Mohammed Daif; Kalankesh, Hamid Vahed
- Abstract
A highly sensitive D-shaped microfluidic channel (MFC) incorporated in a single-mode fiber (SMF) equipped with a tungsten trioxide ( W O 3 ) layer coated with gold (Au) or silver (Ag) on the base of the MFC is designed and investigated utilizing a finite element method (FEM) to obtain the sensing performance of the optical fiber surface plasmon resonance (SPR) structure. The proposed sensor is appropriate for both bimetallic layers and analytes. With the sizeable cladding diameter of SMF, the fluidic channel size can be changed following demand, making fabrication more accessible and applicable. The hollow D-section above the core deposited a bimetallic structure of silver (Ag) or gold (Au) as plasmonic materials, followed by a tungsten trioxide ( W O 3 ) nanolayer. This optical fiber biochemical monitors the changes in the refractive index (RI) by measuring the transmission spectral shifts of the fiber at their resonance wavelengths. The W O 3 layer protects the plasmonic material from oxidation and effectively enhances the surface plasmon wave (SPW) while interacting with free electrons. Upon achieving the optimum structural parameters, the numerical investigation results showed that the maximum wavelength sensitivity of 6.0 μ m//RIU and 5.0 μ m//RIU for Au/ W O 3 and Ag/ W O 3 were obtained, with the coefficient of performance of 50.12 R I U - 1 and 134.84 R I U - 1 , respectively, for ultra-wide sensing ranges from 1.28 to 1.38. Also, the simulation outcomes revealed that the tungsten trioxide-coated with Ag or Au layers significantly enhanced the sensor. Finally, the numerical results of this study showed that the proposed sensor has substantial possibilities for large sensing RI applications such as biology and chemistry analytes, and it is also valid for other lower RI analyte sensing requirements as a consequence of its features such as high sensitivity, simple design, cost-effective design, and promising linear sensing performance.
- Subjects
REFRACTIVE index; PLASTIC optical fibers; SURFACE plasmon resonance; TUNGSTEN trioxide; SINGLE-mode optical fibers; OPTICAL fibers; FINITE element method; OPTICAL fiber detectors
- Publication
Plasmonics, 2024, Vol 19, Issue 3, p1383
- ISSN
1557-1955
- Publication type
Article
- DOI
10.1007/s11468-023-02077-4