Electrically Tunable Damping of Plasmonic Resonances with Graphene

Naresh K. Emani, Ting-Fung Chung, Xingjie Ni, Alexander V. Kildishev, Yong P. Chen, Alexandra Boltasseva

    Research output: Contribution to journalJournal articleResearchpeer-review


    Dynamic switching of a plasmonic resonance may find numerous applications in subwavelength optoelectronics, spectroscopy, and sensing. Graphene shows a highly tunable carrier concentration under electrostatic gating, and this could provide an effective route to achieving electrical control of the plasmonic resonance. In this Letter, we demonstrate electrical control of a plasmonic resonance at infrared frequencies using large-area graphene. Plasmonic structures fabricated on graphene enhance the interaction of the incident optical field with the graphene sheet, and the impact of graphene is much stronger at mid-infrared wavelengths. Full-wave simulations, where graphene is modeled as a 1 nm thick effective medium, show excellent agreement with experimental results.
    Original languageEnglish
    JournalNano Letters
    Issue number10
    Pages (from-to)5202–5206
    Publication statusPublished - 2012


    • Graphene
    • Plasmonics
    • Tunable resonances
    • Interband losses


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