Journal
PHYSICAL REVIEW APPLIED
Volume 10, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.10.054053
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Funding
- National Research Foundation of Korea (NRF) [2017R1E1A1A01074323]
- KAIST Global Center for Open Research with Enterprise (GCORE) - Ministry of Science and ICT [N11180017]
- Air Force Office of Scientific Research [FA9550-16-1-0019]
- Wisconsin Alumni Research Foundation
- Basic Science Research Program through NRF - Ministry of Education [2017R1D1A1B03034762]
- National Research Foundation of Korea [2017R1E1A1A01074323, 2017R1D1A1B03034762] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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