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

Jang, Min Seok and Kim, Seyoon and Brar, Victor W. and Menabde, Sergey G. and Atwater, Harry A. (2018) Modulated Resonant Transmission of Graphene Plasmons Across a λ/50 Plasmonic Waveguide Gap. Physical Review Applied, 10 (5). Art. No. 054053. ISSN 2331-7019. doi:10.1103/PhysRevApplied.10.054053.

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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-µm 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Material
Jang, Min Seok0000-0002-5683-1925
Kim, Seyoon0000-0002-8040-9521
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2018 American Physical Society. Received 7 June 2018; revised manuscript received 7 September 2018; published 26 November 2018. The authors acknowledge support from the National Research Foundation of Korea (NRF) (Grant No. 2017R1E1A1A01074323, M.S.J.) and KAIST Global Center for Open Research with Enterprise (GCORE) (Grant No. N11180017, S.G.M.) funded by the Ministry of Science and ICT, and Basic Science Research Program through NRF funded by the Ministry of Education (Grant No. 2017R1D1A1B03034762, M.S.J). M.S.J., V.W.B., and H.A.A. acknowledge support from the Air Force Office of Scientific Research through Grant No. FA9550-16-1-0019. V.W.B. thanks the Wisconsin Alumni Research Foundation for support. M.S.J., and S.K. contributed equally to this work.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
National Research Foundation of Korea2017R1E1A1A01074323
Korea Advanced Institute of Science and Technology (KAIST)N11180017
Ministry of Education (Korea)2017R1D1A1B03034762
Air Force Office of Scientific Research (AFOSR)FA9550-16-1-0019
Wisconsin Alumni Research FoundationUNSPECIFIED
Issue or Number:5
Record Number:CaltechAUTHORS:20181126-095629290
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91158
Deposited By: Tony Diaz
Deposited On:26 Nov 2018 18:10
Last Modified:16 Nov 2021 03:39

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