Design and analysis of fiber optic SPR sensor under optimum radiation damping for the detection of Escherichia coli bacteria

IF 2.6 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical Fiber Technology Pub Date : 2025-02-10 DOI:10.1016/j.yofte.2025.104170

Adarsh Chandra Mishra , Anuj K. Sharma , Pooja Lohia , D.K. Dwivedi

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引用次数: 0

Abstract

This article presents a theoretical investigation of fiber based plasmonic biosensor for the detection of e-coli bacteria in water medium. The method involves systematic optimization of parameters under optimum radiation damping (ORD) in near infrared region of wavelength. The sensor design consists of a 13.1 % germanium doped silica core, perfluorinated homopolymer cladding and a heterostructure of gallium nitride (GaN), silver (Ag) and aluminum nitride (AlN). Poly-l-lysine homopolymer is used over AlN to improve the specificity of the sensor by immobilization of bacteria on fiber surface. The structure is optimized based on the thickness of layers and operating wavelength using 2D simulation technique on MATLAB software. The initial simulations provided a figure of merit (FOM) of 4219 RIU⁻¹ which enhanced up to 14,420 RIU⁻¹ after simultaneous optimization of thicknesses. We demonstrated that our sensing mechanism is extremely accurate and capable of reliable detection of e-coli with sensitivity of 201.86 deg./RIU, FWHM of 0.014° and power loss ratio (PLR) of 3.09. The combined FOM for the sensor is 44255.58 μm⁴/RIU which is way higher than previously reported designs. The chosen materials are easily available and cheap with well-established fabrication techniques. Due to its high FOM and selectivity, the sensor opens the possibility of successful device level implementation.

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.