Hybrid plasmonic waveguide-assisted Metal-Insulator-Metal ring resonator for refractive index sensing

A highly sensitive refractive index sensor based on an integrated hybrid plasmonic waveguide (HPWG) and a Metal-Insulator-Metal (M-I-M) micro-ring resonator is presented. In our design, there are two slot-waveguide-based micro-rings that encircle a gold disc. The outer slot WG is formed by the combi...

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Bibliographic Details
Published in:Journal of modern optics 2018-05, Vol.65 (9), p.1135-1140
Main Authors: Butt, M. A., Khonina, S. N., Kazanskiy, N. L.
Format: Article
Language:English
Subjects:
compact ring resonator
Computer simulation
Electric power distribution
Finite element method
Gold
high sensitivity
Hybrid plasmonic waveguide
Insulators
Metal-Insulator-Metal waveguide
Metals
Photonics
Refractivity
Resonators
Sensors
Silicon
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Summary:A highly sensitive refractive index sensor based on an integrated hybrid plasmonic waveguide (HPWG) and a Metal-Insulator-Metal (M-I-M) micro-ring resonator is presented. In our design, there are two slot-waveguide-based micro-rings that encircle a gold disc. The outer slot WG is formed by the combination of Silicon-Air-Gold ring and the inner slot-waveguide is formed by Gold ring-Air-Gold disc. The slot-waveguide rings provide an interaction length sufficient to accumulate a detectable wavelength shift. The transmission spectrum and electric field distribution of this sensor structure are simulated using Finite Element Method (FEM). The sensitivity of this micro-ring resonator is achieved at 800 nm/RIU which is about six times higher than that of the conventional Si ring with the same geometry. Our proposed sensor design has a potential to find further applications in biomedical science and nano-photonic circuits.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2018.1427290