Analysis of a graphene-based silicon electro-absorption modulator in isotropic and anisotropic graphene models

Byoung Jun Park, Myung Ki Kim, Jin Tae Kim

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    We theoretically investigated a graphene-based silicon electro-absorption modulator in both isotropic and anisotropic graphene models. Regardless of the graphene model, the optical transmission increases with the chemical potential of graphene because of the Pauli blocking principle. However, we found that the modulator based on the isotropic graphene exhibits an abrupt decrease in transmission for the transverse-magnetic (TM) polarization mode due to the epsilon-near-zero effect in the isotropic graphene at a certain chemical potential. Conversely, the anisotropic graphenebased modulator exhibits no such transmission dip. These particular behaviors provide us with a simple and easy experimental way to confirm whether graphene is an isotropic or anisotropic material. To further enhance the transmission dip in the isotropic graphene model, we suggest a simply modified modulator structure that increases the transmission depth by ~ 0.5 dB/μm for the TM polarization mode.

    Original languageEnglish
    Pages (from-to)967-972
    Number of pages6
    JournalJournal of the Korean Physical Society
    Volume70
    Issue number11
    DOIs
    Publication statusPublished - 2017 Jun 1

    Bibliographical note

    Publisher Copyright:
    © 2017, The Korean Physical Society.

    Keywords

    • Electro-absorption modulators
    • Graphene photonics
    • Optical waveguides
    • Silicon photonics

    ASJC Scopus subject areas

    • General Physics and Astronomy

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