Subwavelength Grating Double Slot Waveguide Racetrack Ring Resonator for Refractive Index Sensing Application
1
Department of Technical Cybernetics, Samara National Research University, 443086 Samara, Russia
2
Institute of RAS-Branch of the FSRC “Crystallography and Photonics” RAS, 443086 Samara, Russia
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(12), 3416; https://doi.org/10.3390/s20123416
Received: 24 May 2020
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Revised: 10 June 2020
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Accepted: 15 June 2020
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Published: 17 June 2020
(This article belongs to the Special Issue Sensors Based on Diffraction Structures)
In this paper, a racetrack ring resonator design based on a subwavelength grating double slot waveguide is presented. The proposed waveguide scheme is capable of confining the transverse electric field in the slots and the gaps between the grating segments. This configuration facilitates a large light–matter interaction which elevates the sensitivity of the device approximately 2.5 times higher than the one that can be obtained via a standard slot waveguide resonator. The best sensitivity of the design is obtained at 1000 nm/RIU by utilizing a subwavelength grating double slot waveguide of period 300 nm. The numerical study is conducted via 2D and 3D finite element methods. We believe that the proposed sensor design can play an important role in the realization of highly sensitive lab-on-chip sensors.
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Keywords:
single-slot waveguide; double slot waveguide; subwavelength grating single slot waveguide; subwavelength grating double slot waveguide; racetrack ring resonator; refractive index sensor
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MDPI and ACS Style
Kazanskiy, N.L.; Khonina, S.N.; Butt, M.A. Subwavelength Grating Double Slot Waveguide Racetrack Ring Resonator for Refractive Index Sensing Application. Sensors 2020, 20, 3416. https://doi.org/10.3390/s20123416
AMA Style
Kazanskiy NL, Khonina SN, Butt MA. Subwavelength Grating Double Slot Waveguide Racetrack Ring Resonator for Refractive Index Sensing Application. Sensors. 2020; 20(12):3416. https://doi.org/10.3390/s20123416
Chicago/Turabian StyleKazanskiy, Nikolay L., Svetlana N. Khonina, and Muhammad A. Butt. 2020. "Subwavelength Grating Double Slot Waveguide Racetrack Ring Resonator for Refractive Index Sensing Application" Sensors 20, no. 12: 3416. https://doi.org/10.3390/s20123416
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