High-Sensitivity Bimodal Plasmo-Photonic Refractive Index Sensor
ACS Photonics, vol. 10, pp. 2580–2588
Abstract
We present a new, ultracompact bimodal interferometric plasmonic sensor integrated on a SU-8 photonic waveguide platform. Two access SU-8 photonic waveguides are separated by an aluminum-based stripe, which resides on top of a thinner SU-8 waveguide layer. In this way, two metal/insulator interfaces are formed at the top and bottom metal surfaces, which are capable of supporting two respective surface plasmon polariton (SPP) modes that are subsequently interfering with the output photonic waveguide. The upper metal surface is exposed to the surrounding medium and serves as the sensing element, while the lower surface serves as the reference branch of the interferometer. After a thorough optimization process, the device was fabricated and experimentally characterized. A clear bimodal interferometric response was obtained when the upper metallic surface was exposed to air and water, with both cases revealing an excellent agreement between the simulated and experimental values for the free spectral range. The experimental bulk refractive index sensitivity of the bimodal interferometer was evaluated by using water solutions on top of the upper metallic surface, demonstrating experimental sensitivity values of 4386 nm/RIU that are in good agreement with the value of 5806 nm/RIU expected from the simulation. The proposed sensing device takes advantage of the polymeric material SU-8 for the photonic waveguide, reducing in this way fabrication time and overall fabrication cost.
Authors 14
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Konstantinos Fotiadis corresponding
Aristotle University of Thessaloniki
Affiliation as printed
Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Buildings A & B, Thessaloniki, 10th km Thessaloniki-Thermi Rd, Thessaloniki 57001, Greece
Department of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Central Macedonia 54124, Greece
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Aristotle University of Thessaloniki
Affiliation as printed
Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Buildings A & B, Thessaloniki, 10th km Thessaloniki-Thermi Rd, Thessaloniki 57001, Greece
Department of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Central Macedonia 54124, Greece
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Aristotle University of Thessaloniki
Affiliation as printed
Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Buildings A & B, Thessaloniki, 10th km Thessaloniki-Thermi Rd, Thessaloniki 57001, Greece
Department of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Central Macedonia 54124, Greece
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Aristotle University of Thessaloniki
Affiliation as printed
Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Buildings A & B, Thessaloniki, 10th km Thessaloniki-Thermi Rd, Thessaloniki 57001, Greece
Department of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Central Macedonia 54124, Greece
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University of Ioannina · Aristotle University of Thessaloniki
Affiliation as printed
Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Buildings A & B, Thessaloniki, 10th km Thessaloniki-Thermi Rd, Thessaloniki 57001, Greece
Department of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Central Macedonia 54124, Greece
Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece
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AMO (Germany) · RWTH Aachen University
Affiliation as printed
Advanced Microelectronic Center Aachen, AMO GmbH, Aachen 52074, Germany
Chair of Electronic Devices, RWTH Aachen University, Aachen 52062, Germany
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Affiliation as printed
Advanced Microelectronic Center Aachen, AMO GmbH, Aachen 52074, Germany
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Affiliation as printed
Advanced Microelectronic Center Aachen, AMO GmbH, Aachen 52074, Germany
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AMO (Germany) · RWTH Aachen University
Affiliation as printed
Advanced Microelectronic Center Aachen, AMO GmbH, Aachen 52074, Germany
Chair of Electronic Devices, RWTH Aachen University, Aachen 52062, Germany
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Centre National de la Recherche Scientifique · Université de Bourgogne · Laboratoire Interdisciplinaire Carnot de Bourgogne
Affiliation as printed
Laboratoire Interdisciplinaire Carnot de Bourgogne CNRS UMR 6303, Université de Bourgogne Franche-Comté, 21000 Dijon, France
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Centre National de la Recherche Scientifique · Université de Bourgogne · Laboratoire Interdisciplinaire Carnot de Bourgogne
Affiliation as printed
Laboratoire Interdisciplinaire Carnot de Bourgogne CNRS UMR 6303, Université de Bourgogne Franche-Comté, 21000 Dijon, France
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Centre National de la Recherche Scientifique · Université de Bourgogne · Laboratoire Interdisciplinaire Carnot de Bourgogne
Affiliation as printed
Laboratoire Interdisciplinaire Carnot de Bourgogne CNRS UMR 6303, Université de Bourgogne Franche-Comté, 21000 Dijon, France
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Affiliation as printed
Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece
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Aristotle University of Thessaloniki
Affiliation as printed
Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Buildings A & B, Thessaloniki, 10th km Thessaloniki-Thermi Rd, Thessaloniki 57001, Greece
Department of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Central Macedonia 54124, Greece
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