Mode-multiplex plasmonic sensor for multi-analyte detection


Haider, Firoz and Ahmmed Aoni, Rifat and Ahmed, Rajib and Amouzad Mahdiraji, Ghafour and Azman, Mohd Fahmi and Mahamd Adikan, Faisal Rafiq (2020) Mode-multiplex plasmonic sensor for multi-analyte detection. Optics Letters, 45 (14). p. 3945. ISSN 0146-9592

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Highly sensitive mode-multiplex miniaturized sensors enable the detection and quantification of multiple biomolecules simultaneously through their real-time interactions. Here, we demonstrate a grapefruit Photonic Crystal Fiber (PCF) based mode-multiplex Surface Plasmon Resonance (SPR) sensor that detects multiple analytes simultaneously. Three grapefruit-shaped airholes are internally coated with plasmonic gold (Au) material which allows them to act as mode-multiplex channels that detect three unknown analytes. The sensor performance was investigated using the Finite Element Method (FEM), and the optimized fiber structure was fabricated with the standard stack-and-draw method. For the y-polarized mode, channels 1 and 3 showed the maximum wavelength sensitivities of 2,000 and 18,000 nm/ RIU (refractive index unit) at the analyte refractive indices of 1.34 and 1.41, respectively. On the other hand, channel 2 showed the maximum wavelength sensitivity of 3,000 nm/RIU at the analyte refractive index (RI) of 1.36 for the x-polarized mode. To the best of our knowledge, this is first demonstration of mode-multiplex grapefruit PCF based SPR sensor to simultaneously detect and quantify three different analytes. We anticipate that the proposed sensor will find potential applications in the detection of real-time biomolecular interactions and binding affinity.

Item Type: Article
Uncontrolled Keywords: Plasmonics
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 28 Dec 2020 15:26
Last Modified: 28 Dec 2020 15:26


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