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Polarization control using passive and active crossed graphene gratings.

Jian Wei You, Nicolae C Panoiu

    Optics Express
    |February 7, 2018
    PubMed
    Summary

    Novel graphene nanostructures offer ultrathin, miniaturized terahertz (THz) metasurfaces for polarization control. These devices enable passive polarization conversion and active control of higher harmonics using graphene

    Area of Science:

    • Photonics and optical engineering
    • Materials science
    • Terahertz (THz) technology

    Background:

    • Graphene's unique optical properties enable miniaturization of THz metasurfaces and photonic devices.
    • Current THz devices often face limitations in size and efficiency.

    Purpose of the Study:

    • To propose novel graphene nanostructures for controlling the polarization state of THz waves.
    • To develop ultrathin polarization converters and explore active control of THz wave polarization.

    Main Methods:

    • Design of optical metasurfaces composed of two crossed graphene gratings separated by an insulator spacer.
    • Investigation of both linear and nonlinear optical properties of graphene for THz applications.

    Main Results:

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    • Demonstration of ultrathin graphene polarizers with significant size reduction compared to metallic devices.
    • Effective selection of specific polarization states using designed graphene polarizers.
    • Utilization of nonlinear optical properties for active control over polarization states of generated higher harmonics.

    Conclusions:

    • Graphene nanostructures provide a viable route for miniaturized THz metasurfaces.
    • Proposed devices function as efficient ultrathin polarization converters in the THz domain.
    • Graphene's nonlinearities offer opportunities for active THz polarization manipulation.