Journal
IEEE SENSORS JOURNAL
Volume 21, Issue 17, Pages 18688-18695Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2021.3090222
Keywords
Sensors; Plasmons; Nanostructures; Graphene; Substrates; Sensor phenomena and characterization; Optical fiber sensors; Plasmonic induced transparency; sensors; metamaterials
Funding
- Tianjin Applied Foundation and Advanced Technology Research Program (Youth Program) [18JCQNJC71400]
- Youth Science Foundation Project of National Natural Science Foundation of China [61505144]
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The research investigates infrared multi-narrowband tunable plasmonic induced transparency and its application as a plasmonic sensor. By exciting quasi-guided modes in the Al2O3/SiO2 slab waveguide with plasmonic periodic E shaped metallic nanostructures, multiple Fano-shaped transmissions are achieved.
We propose and numerically investigate infrared multi-narrowband tunable plasmonic induced transparency and its application as plasmonic sensor. Quasi-guided modes can be excited in Al2O3/SiO2 slab waveguide by the plasmonic periodic E shaped metallic nanostructures, which leads to multiple Fano-shaped transmission. The designed nanoparticle/slab waveguide/Si substrate structure exhibits multi-narrowband transparency and high reflectivity, which is easy to prepare and integrate. We further demonstrate electric tunability of multi Fano resonances by the introduction of larger-area graphene in the wavelength range 2000-3000 nm. Considering the multiple narrow bands and electric tunning performances of this structure, it is suitable to be utilized as a sensor. It shows that the figure of merit (FOM*) of the sensor can reach 66548 within the refractive index range 1.3-1.39. Moreover, the plasmonic sensor can also be used as a multiband optical switch with modulation depth up to 70%.
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