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Vertically Coupled Plasmonic Racetrack Ring Resonator for Biosensor Applications
Kirill V Voronin1,2, Yury V Stebunov1,3, Artem A Voronov1
1Center for Photonics & 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, Russia.
Sensors (Basel, Switzerland)
|January 8, 2020
Summary
We developed a novel plasmonic refractive index sensor using a metal strip waveguide and racetrack ring resonator. This compact biosensor design offers high sensitivity for detecting biomolecules, ideal for wearable devices.
Area of Science:
- Photonics and Nanotechnology
- Biosensing Technology
Background:
- Plasmonic sensors offer high sensitivity and compact sizes, making them suitable for mobile and wearable biosensing applications.
- Challenges in plasmonic biosensor design include metal losses and complex implementation, hindering optimal configurations for compact devices.
Purpose of the Study:
- To propose and analyze a novel compact plasmonic refractive index sensor.
- To enhance the sensitivity and practical implementation of plasmonic biosensors for mobile and wearable applications.
Main Methods:
- Numerical simulations and analytical estimations were employed to analyze the sensor's properties.
- A novel design featuring a metal strip waveguide beneath a racetrack ring resonator was proposed.
Main Results:
- The proposed sensor design ensures effective coupling and low-loss light transmission.
- Sensitivity can be significantly increased by manipulating the refractive index of surrounding media, reaching over 1 μm/RIU.
Conclusions:
- The novel plasmonic sensor design is easily fabricated and integrable with materials like graphene oxide.
- This configuration provides a promising platform for highly sensitive, compact biosensors for various applications.
