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

Abstract

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
Volume12
Issue number10
Pages (from-to)5202–5206
ISSN1530-6984
DOIs
Publication statusPublished - 2012

Keywords

  • Graphene
  • Plasmonics
  • Tunable resonances
  • Interband losses

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