Mid-infrared water pollutant sensor based on SPR-PCF

• DOI: 10.1007/s11082-023-05207-8
• Publication Date: 2023-09-02T06:02:04Z
• Authors: Yusuf Gamal; B. M. Younis; Ahmed El-Sayed Ab...; David Furniss; Mark Farries; Sendy Phang; Trevor M. Benson; Angela B. Seddon; Mohamed Farhat O....; S. S. A. Obayya
• Keywords: Nanorod

Abstract In this paper, a highly sensitive water pollutant optical sensor is proposed and analyzed. The suggested consists of photonic crystal fiber with core surrounded by four elliptical holes infiltrated the studied analyte (pure/polluted sample). addition, two gold nanorods are mounted horizontally at inner surfaces horizontal holes. can efficiently detect dissolved pollutants in such as nitric acid ( $${\mathrm{HNO}}_{3}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>HNO</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:math> ) concentrations 14, 23 35% $${\mathrm{H}}_{2}{\mathrm{O}}_{2}$$ <mml:mrow> <mml:mi>H</mml:mi> <mml:mn>2</mml:mn> <mml:mi>O</mml:mi> </mml:mrow> 7, 15 30%. (analyte) have refractive indices (RIs) range 1.350–1.355 mid infrared regime from λ = 2200 nm to 3500 nm. A fully vectorial finite element method (FVFEM) employed for modal analysis reported structure. geometrical parameters maximize RI sensitivity where high 36,000 nm/RIU achieved between RIs 1.350 1.355. obtained higher than those recent sensors literature especially operating wavelengths.