Next Article in Journal
An Online Charging Scheme for Wireless Rechargeable Sensor Networks Based on a Radical Basis Function
Previous Article in Journal
Evaluation of Delamination in Concrete by IE Testing Using Multi-Channel Elastic Wave Data

Vertically Coupled Plasmonic Racetrack Ring Resonator for Biosensor Applications

Center for Photonics & 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia
Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russia
GrapheneTek, 7 Nobel Street, Skolkovo Innovation Center, Moscow 143026, Russia
Author to whom correspondence should be addressed.
Sensors 2020, 20(1), 203;
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
Show Figures

Graphical abstract

MDPI and ACS Style

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.

AMA Style

Voronin KV, Stebunov YV, Voronov AA, Arsenin AV, Volkov VS. Vertically Coupled Plasmonic Racetrack Ring Resonator for Biosensor Applications. Sensors. 2020; 20(1):203.

Chicago/Turabian Style

Voronin, Kirill V., Yury V. Stebunov, Artem A. Voronov, Aleksey V. Arsenin, and Valentyn S. Volkov. 2020. "Vertically Coupled Plasmonic Racetrack Ring Resonator for Biosensor Applications" Sensors 20, no. 1: 203.

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop