Journal
SENSORS
Volume 17, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/s17040784
Keywords
plasmonic refractive index sensor; finite element method; Fano resonance; coupled-mode theory
Funding
- National Natural Science Foundation of China [61605177, 61675185]
- National Science Fund for Distinguished Young Scholars [61525107]
- Natural Science Foundation of Shanxi Province [201601D011008]
- Natural Science Research Foundation of the North University of China [110246]
- Open Research Fund Program of Hebei Collaborative Innovation Center for Aerospace Remote Sensing Information Processing and Application
- Fund Program for the Scientifc Activities of Selected Returned Overseas Professionals in Shanxi Province
- North University of China Science Fund for Distinguished Young Scholars
Ask authors/readers for more resources
A surface plasmon polariton refractive index sensor based on Fano resonances in metal-insulator-metal (MIM) waveguides coupled with rectangular and ring resonators is proposed and numerically investigated using a finite element method. Fano resonances are observed in the transmission spectra, which result from the coupling between the narrow-band spectral response in the ring resonator and the broadband spectral response in the rectangular resonator. Results are analyzed using coupled-mode theory based on transmission line theory. The coupled mode theory is employed to explain the Fano resonance effect, and the analytical result is in good agreement with the simulation result. The results show that with an increase in the refractive index of the fill dielectric material in the slot of the system, the Fano resonance peak exhibits a remarkable red shift, and the highest value of sensitivity (S) is 1125 nm/RIU, RIU means refractive index unit. Furthermore, the coupled MIM waveguide structure can be integrated with other photonic devices at the chip scale. The results can provide a guide for future applications of this structure.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available