A Surface Plasmon Resonance Sensor Used for the detection of trace Sodium Nitrate in Water

Volume 20 No 7 (2022)

Farah Z. Hassan, Hashim Ali

DOI: 10.14704/nq.2022.20.7.NQ33092

Abstract

In this paper, a reflective optical fiber sensor was fabricated and used to detect sodium nitrate NaNO₃ concentrations in water. This optical fiber sensor is based on a very important phenomenon called surface plasmon resonance (SPR). In order to achieve this phenomenon, the side surfaces of the optical fiber were coated with a golden film with a thickness of 40 nm, and the final surface of the fiber was also coated with a golden film, but with a thickness of 60 nm, to reflect the optical signal.

Keywords

Optical Fiber, No-core Fiber, Sensor, Sodium Nitrate.

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