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Open AccessArticle

Vertically Coupled Plasmonic Racetrack Ring Resonator for Biosensor Applications

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Center for Photonics & 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
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Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russia
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GrapheneTek, 7 Nobel Street, Skolkovo Innovation Center, Moscow 143026, Russia
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(1), 203; https://doi.org/10.3390/s20010203
Received: 1 December 2019 / Revised: 23 December 2019 / Accepted: 26 December 2019 / Published: 30 December 2019
Plasmonic chemical and biological sensors offer significant advantages such as really compact sizes and extremely high sensitivity. Biosensors based on plasmonic waveguides and resonators are some of the most attractive candidates for mobile and wearable devices. However, high losses in the metal and complicated schemes for practical implementation make it challenging to find the optimal configuration of a compact plasmon biosensor. Here, we propose a novel plasmonic refractive index sensor based on a metal strip waveguide placed under a waveguide-based racetrack ring resonator made of the same metal. This scheme guarantees effective coupling between the waveguide and resonator and low loss light transmittance through the long-range waveguide. The proposed device can be easily fabricated (e.g., using optical lithography) and integrated with materials like graphene oxide for providing adsorption of the biomolecules on the sensitive part of the optical elements. To analyze the properties of the designed sensing system, we performed numerical simulations along with some analytical estimations. There is one other interesting general feature of this sensing scheme that is worth pointing out before looking at its details. The sensitivity of the considered device can be significantly increased by surrounding the resonator with media of slightly different refractive indices, which allows sensitivity to reach a value of more than 1 μm per refractive index unit. View Full-Text
Keywords: biosensors; plasmonic ring resonators; metal-strip waveguides biosensors; plasmonic ring resonators; metal-strip waveguides
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Voronin, K.V.; Stebunov, Y.V.; Voronov, A.A.; Arsenin, A.V.; Volkov, V.S. Vertically Coupled Plasmonic Racetrack Ring Resonator for Biosensor Applications. Sensors 2020, 20, 203.

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