Numerical model to optimize the design of plasmonic optical fiber tips towards highly sensitive biosensing

Miguel Vidal; Ana Sofia Assunção; Margarida Facão; Cátia Leitão

doi:10.1117/12.2678081

23 May 2023 Numerical model to optimize the design of plasmonic optical fiber tips towards highly sensitive biosensing

Miguel Vidal, Ana Sofia Assunção, Margarida Facão, Cátia Leitão

Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 126431N (2023) https://doi.org/10.1117/12.2678081
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium

Abstract

Optical fibers have been explored as sensors for application in different fields, including diagnostics, food security, and environmental monitoring, due to their low size and weight, flexibility and electrical safety. Particularly, optical fiber biosensors based on surface plasmon resonance (SPR) are broadly reported given their rapid, label-free and highly sensitive sensing ability. Among them, plasmonic unclad tips are a cost-effective tool, in which light is reflected by the metal at the fiber end-face, eliciting SPR and doubling the optical path. Tips are recognized for their sensitivity, portability and mechanical strength, being more suitable for in-situ sensing compared to fragile or less compact sensors. In this work, a numerical model was developed to simulate the SPR curve of Au-coated tips (Au-tips) to readily predict their optimized design parameters and therefore enhance their sensitivity. The algorithm determined the reflected power using the three-layer Fresnel equation for p-polarization, with the SPR response being simulated for solutions with different refractive index (RI) surrounding the sensing area. The performance was then assessed by determination of the sensitivity. This way, a relationship was established between the sensor’s performance and its parameters, namely, the ratio between sensing region length and core diameter, numerical aperture and Au thickness. This simple method provided the idealized design parameters for an Au-tip sensor, which might have application for RI monitoring and as a highly sensitive biosensor.

Citation Download Citation

Miguel Vidal, Ana Sofia Assunção, Margarida Facão, and Cátia Leitão "Numerical model to optimize the design of plasmonic optical fiber tips towards highly sensitive biosensing", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 126431N (23 May 2023); https://doi.org/10.1117/12.2678081

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KEYWORDS

Gold

Optical fibers

Design and modelling

Biosensing

Plasmonics

Reflection

Biosensors

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