Journal
SENSORS
Volume 17, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/s17071494
Keywords
surface plasmon polaritons; refractive index; Fano resonance; finite element method
Funding
- National Natural Science Foundation of China [61675185]
- Natural Science Foundation of Shanxi Province [201601D011008]
- Open Research Fund Program of Hebei Collaborative Innovation Center for Aerospace Remote Sensing Information Proccessing and Application [67-Y20A07-9002-16/17]
- Fund Program for the Scientic Activities of Selected Returned Overseas Professionals in Shanxi Province
- Program for the Top Youngand Middle-aged Innovative Talents of Higher Learning Institutions of Shanxi
- North University of China Science Fund for Distinguished Young Scholars
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A plasmonic waveguide coupled system that uses a metal-insulator-metal (MIM) waveguide with two silver baffles and a coupled ring cavity is proposed in this study. The transmission properties of the plasmonic system were investigated using the finite element method. The simulation results show a Fano profile in the transmission spectrum, which was caused by the interaction of the broadband resonance of the Fabry-Perot (F-P) cavity and the narrow band resonance of the ring cavity. The Fabry-Perot (F-P) cavity in this case was formed by two silver baffles dividing the MIM waveguide. The maximum sensitivity of 718 nm/RIU and the maximum figure of merit of 4354 were achieved. Furthermore, the effects of the structural parameters of the F-P cavity and the ring cavity on the transmission properties of the plasmonic system were analyzed. The results can provide a guide for designing highly sensitive on-chip sensors based on surface plasmon polaritons.
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