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Modulation of graphene THz absorption based on HAuCl4 doping method.

Qiannan Li, Kaixi Bi, Yaokai Niu

    Optics Express
    |October 27, 2022
    PubMed
    Summary

    This study introduces a novel graphene-based terahertz (THz) absorber. Doping graphene with HAuCl4 significantly enhances THz absorption by tuning its Fermi Level, improving performance for applications like electromagnetic shielding.

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    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Nanotechnology

    Background:

    • Graphene's tunable Fermi Level (EF) makes it promising for terahertz (THz) absorbers.
    • Modulating graphene's EF and THz absorption is a key research area.

    Purpose of the Study:

    • To propose and characterize a novel sandwich-structured single-layer graphene (SLG)/Polyimide (PI)/Au THz absorber.
    • To investigate the effect of HAuCl4 doping on graphene's EF and THz absorption properties.

    Main Methods:

    • Fabrication of a SLG/PI/Au sandwich structure with HAuCl4-doped graphene.
    • Characterization using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy.
    • Experimental and simulation analysis of THz absorption spectra.

    Main Results:

    • HAuCl4 doping shifted graphene's EF by approximately 0.42 eV.
    • Sheet resistance decreased from 1065 Ω/sq (undoped) to 375 Ω/sq (100 mM doping).
    • Absorbance increased from 40% to 80% at 0.65 THz and 50% to 90% at 2.0 THz with 100 mM doping.

    Conclusions:

    • The proposed THz absorber achieves high absorption due to impedance matching and resonant cavity effects within the sandwich structure.
    • The simple fabrication method and agreement between experimental and simulation results highlight its practical potential.
    • The device is suitable for electromagnetic shielding and imaging, and the doping method can be applied to other graphene-based devices.