High Sensitivity Plasmonic Metal-Dielectric-Metal Device With Two Side-Coupled Fano Cavities

In this paper, we propose a compact plasmonic sensor structure comprised of a metal-dielectric-metal (MDM) waveguide, and a baffle plate in waveguide core and two side-coupled rectangular cavities. In this structure, two Fano resonances are achieved and can be tuned independently by changing the str...

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Bibliographic Details
Published in:Photonic sensors (Berlin) 2019-09, Vol.9 (3), p.205-212
Main Authors: Lu, Yunqing, Xu, Jiong, Xu, Min, Xu, Ji, Wang, Jin, Zheng, Jiajin
Format: Article
Language:English
Subjects:
Computer simulation
Fano resonance
Figure of merit
Lasers
MDM waveguide
Measurement Science and Instrumentation
Microwaves
Optical Devices
Optics
Parameter sensitivity
Photonics
Physics
Physics and Astronomy
Plates (structural members)
Refractivity
Regular
RF and Optical Engineering
Sensitivity analysis
Sensitivity enhancement
sensor
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Description
Summary:In this paper, we propose a compact plasmonic sensor structure comprised of a metal-dielectric-metal (MDM) waveguide, and a baffle plate in waveguide core and two side-coupled rectangular cavities. In this structure, two Fano resonances are achieved and can be tuned independently by changing the structural parameters of the cavities. Especially, when the resonant wavelengths of the two Fano resonances are the same, the sensing sensitivity can be enhanced by coupling between two Fano resonances. By investigating the transmission spectrum, the effect of structural parameters on Fano resonances and the refractive index sensitivity of the sensor structure are analyzed in detail. The numerical simulations demonstrate a sensitivity as high as 1295nm/RIU and a figure of merit of 1647.
ISSN:1674-9251
2190-7439
DOI:10.1007/s13320-019-0555-8