An electrically tunable plasmonic optical modulator with high modulation depth based on graphene-wrapped silver nanowire

C. Zhang, L. Tu, Z. Huang, L. Liu, P. Zhan*, C. Sun, Z. Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We report a systematic study of a graphene-wrapped plasmonic optical modulator with a high modulation depth. The optical modulator consists of a silver (Ag) nanowire as a single mode plasmonic waveguide being wrapped with a graphene monolayer as an electrically controllable absorbing material. While a thin dielectric spacing layer is used to electrically isolate the Ag nanowire from the graphene monolayer, we find it further promotes higher optical absorption by manipulating a strong electric field at its outer surface, where the graphene layer is located. By optimizing the dielectric layer thickness as well as the Ag nanowire radius, a strong optical modulation of 0.46 dB μm-1 with a high-speed characteristic at the operating wavelength of 785 nm is achieved. This design is further implemented at the telecommunication wavelength (1550 nm) with an optimized modulation depth of 1.07 dB μm-1.

Original languageEnglish (US)
Article number125007
JournalJournal of Optics (United Kingdom)
Volume18
Issue number12
DOIs
StatePublished - Dec 2016

Keywords

  • graphene
  • modulators
  • plasmonics
  • waveguides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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