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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Tunable light absorption of graphene using topological interface states.

Y C Lin, S H Chou, W J Hsueh

    Optics Letters
    |August 16, 2020
    PubMed
    Summary

    Tunable light absorption in graphene is achieved using topological interface states (TISs) within asymmetric topological photonic crystals (ATPCs). This method enhances light-graphene interactions for optoelectronic devices.

    Area of Science:

    • Condensed matter physics
    • Photonics
    • Materials science

    Background:

    • Graphene exhibits unique electronic properties.
    • Topological photonic crystals (TPCs) offer novel light manipulation capabilities.
    • Enhancing light-matter interactions in graphene is crucial for optoelectronics.

    Purpose of the Study:

    • To present a tunable light absorption method for graphene.
    • To explore the use of topological interface states (TISs) for enhanced light absorption.
    • To investigate the application of asymmetric topological photonic crystals (ATPCs) for modulating graphene's optical properties.

    Main Methods:

    • Embedding monolayer graphene at the interface of ATPCs.
    • Exciting TISs to induce strong light absorption.

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  • Analyzing the dependence of absorption spectra on graphene's chemical potential and ATPC's periodic number.

    • Main Results:

    • A strong light absorption phenomenon was observed due to TIS excitation.
    • Absorption spectra showed significant dependence on graphene's chemical potential and ATPC's periodic number.
    • Absorption was rapidly switchable via gate voltage-modulated chemical potential variations.

    Conclusions:

    • The study demonstrates a novel approach for tunable light absorption in graphene.
    • This method significantly enhances light-graphene interactions.
    • The findings pave the way for high-absorption optoelectronic devices utilizing TISs in ATPCs.