Metallic Grating-Assisted Fiber Optic SPR Sensor with Extreme Sensitivity in IR Region

We theoretically propose a surface plasmon resonance (SPR)-based fiber optic refractive index (RI) sensor. A surface plasmon exciting metallic grating formed with the alternation of indium tin oxide (ITO) and silver (Ag) stripes is considered on the core of the fiber. A thin film of silicon is used...

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Bibliographic Details
Published in:Plasmonics (Norwell, Mass.) Mass.), 2022-04, Vol.17 (2), p.575-579
Main Authors: Mishra, Satyendra K., Tripathi, Durgesh C., Mishra, Akhilesh K.
Format: Article
Language:English
Subjects:
Biochemistry
Biological and Medical Physics
Biophysics
Biotechnology
Chemistry
Chemistry and Materials Science
Fiber optics
Figure of merit
Indium tin oxides
Nanotechnology
Oxidation
Refractivity
Sensitivity
Sensors
Silicon films
Silver
Thin films
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Summary:We theoretically propose a surface plasmon resonance (SPR)-based fiber optic refractive index (RI) sensor. A surface plasmon exciting metallic grating formed with the alternation of indium tin oxide (ITO) and silver (Ag) stripes is considered on the core of the fiber. A thin film of silicon is used as an overlay. Silicon film not only protects the metallic grating from oxidation but also enhances the field to improve the device sensitivity. The sensor is characterized in terms of sensitivity, detection accuracy (DA), figure of merit (FoM), and quality factor (QF). The maximum sensitivity in the RI range 1.33 to 1.38 refractive index unit (RIU) is reported to be ~25 µm/RIU in infra-red region of investigation.
ISSN:1557-1955
1557-1963
DOI:10.1007/s11468-021-01549-9