Modulated Resonant Transmission of Graphene Plasmons Across a lambda/50 Plasmonic Waveguide Gap

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We theoretically demonstrate the nontrivial transmission properties of a graphene-insulator-metal waveguide segment of deeply subwavelength scale. We show that, at midinfrared frequencies, the graphene-covered segment allows for the resonant transmission through the graphene-plasmon modes as well as the nonresonant transmission through background modes, and that these two pathways can lead to a strong Fano interference effect. The Fano interference enables a strong modulation of the overall optical transmission with a very small change in graphene Fermi level. By engineering the waveguide junction, it is possible that the two transmission pathways perfectly cancel each other out, resulting in a zero transmittance. We theoretically demonstrate the transmission modulation from 0% to 25% at 7.5-mu m wavelength by shifting the Fermi level of graphene by a mere 15 meV. In addition, the active region of the device is more than 50 times shorter than the free-space wavelength. Thus, the reported phenomenon is of great advantage to the development of on-chip plasmonic devices.
Publisher
AMER PHYSICAL SOC
Issue Date
2018-11
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW APPLIED, v.10, no.5

ISSN
2331-7019
DOI
10.1103/PhysRevApplied.10.054053
URI
http://hdl.handle.net/10203/248729
Appears in Collection
EE-Journal Papers(저널논문)
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