Abstract
Herein, two simple configurations of Fano resonance-based plasmonic sensors are proposed for temperature and biosensing applications. The device optimization and sensing performance are numerically investigated via two-dimensional finite element method (2D-FEM). The former configuration is quite simple and based on the side-coupled circular cavity (SCCC), whereas in the latter, the circular cavity is encapsulated in the ring separated by a small gap and is known as ring encapsulated circular cavity (RECC). For temperature sensing applications, polydimethylsiloxane (PDMS) is utilized as a thermal sensing medium in the circular cavity. The numerical analysis has revealed that the temperature sensitivity (S) of SCCC and RECC configuration is ~ −0.58 nm/°C and −0.64 nm/°C, respectively. The figure of merit (FOM) is another important parameter to analyze the sensing performance which is around 8.6 and 1955.2 for SCCC and RECC configuration, respectively. The sensing capabilities of the biosensor designs are investigated by injecting dielectric materials of different refractive indices in the circular cavity ranges between 1.33 and 1.37. The S of the SCCC and RECC sensor configuration is around 1240 nm/RIU and 1350 nm/RIU, respectively, with a FOM of 18.74 RIU−1 and 691 RIU−1. The RECC sensor configuration is considered to be straightforward with fewer fabrication complications and offers high sensing performance.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Funding
The research was supported by the Ministry of Science and Higher Education of the Russian Federation in the financing of new laboratories under the guidance of young scientists within the framework of the national project “Science and Universities” (project FSSS-2021–0016) in the part of numerical calculations and under the FSRC “Crystallography and Photonics” of the Russian Academy of Sciences (the state task No. 007-GZ/Ch3363/26) in the part of theoretical analysis. Also, this work was done within the framework of “Hybrid sensor platforms of integrated photonic systems based on ceramic and polymer materials” project which is carried out within the TEAM-NET program of the Foundation for Polish Science financed by the European Union under the European Regional Development Fund, POIR.04.04.00–00-14D6/18–01.
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Butt, M.A., Khonina, S.N. & Kazanskiy, N.L. Simple and Improved Plasmonic Sensor Configuration Established on MIM Waveguide for Enhanced Sensing Performance. Plasmonics 17, 1305–1314 (2022). https://doi.org/10.1007/s11468-022-01633-8
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DOI: https://doi.org/10.1007/s11468-022-01633-8