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Graphene-enabled electrically controlled terahertz spatial light modulators.

Nurbek Kakenov, Taylan Takan, Vedat Ali Ozkan

    Optics Letters
    |May 1, 2015
    PubMed
    Summary
    This summary is machine-generated.

    We developed a broadband terahertz spatial light modulator using graphene supercapacitors. This device offers high contrast terahertz modulation for potential use in imaging and communication systems.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Terahertz (THz) technology requires efficient spatial light modulation.
    • Graphene's unique electronic properties are suitable for optical modulation applications.

    Purpose of the Study:

    • To demonstrate a broadband terahertz spatial light modulator.
    • To utilize graphene supercapacitors for THz modulation.

    Main Methods:

    • Fabrication of a 5x5 array of large-area graphene supercapacitors.
    • Control of spatial charge distribution via patterned graphene electrodes.
    • Application of voltage bias to rows and columns for THz transmittance patterning.

    Main Results:

    • Achieved broadband terahertz spatial light modulation.
    • Demonstrated high modulation depth.
    • Operated the device at low voltage.
    • Patterned THz transmittance through the device.

    Conclusions:

    • The developed graphene-based spatial light modulator offers high contrast THz modulation over a broad spectral range.
    • The device's simple architecture and performance characteristics make it a promising tool for THz imaging and communication.
    • This technology could advance the development of next-generation THz systems.