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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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    We developed a novel graphene metasurface transmit-array that precisely controls light wavefronts for advanced optical applications. This subwavelength structure enables efficient beam focusing and splitting, paving the way for nano-photonics and opto-electronics.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Metasurfaces offer precise control over electromagnetic waves.
    • Graphene's unique electronic properties are ideal for tunable optical devices.
    • Existing flat-optics solutions face limitations in performance and scalability.

    Purpose of the Study:

    • To propose a novel transmit-array configuration using patterned graphene metasurfaces.
    • To demonstrate the capability of molding incident beams by modulating phase and amplitude wavefronts.
    • To explore the potential of this configuration for nano-photonic and opto-electronic applications.

    Main Methods:

    • Designing a transmit-array composed of patterned graphene metasurfaces acting as shunt admittance sheets.
    • Leveraging graphene's tunability, thinness, low loss, and high confinement of graphene plasmons.
    • Implementing the configuration to achieve flat-optics functionalities.

    Main Results:

    • The proposed transmit-array successfully molds incident beams by controlling wavefronts.
    • Subwavelength structures based on patterned graphene metasurfaces were realized.
    • Demonstrated two key flat-optics functionalities: beam focusing and beam splitting.

    Conclusions:

    • The novel graphene metasurface transmit-array offers unprecedented control over light.
    • The proposed subwavelength structure meets stringent requirements for nano-photonic and opto-electronic applications.
    • This configuration provides a versatile platform for advanced optical manipulation.