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Tunable THz reflection-type polarizer based on monolayer phosphorene.

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    Applied Optics
    |December 25, 2019
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    We developed a tunable terahertz (THz) polarizer using phosphorene in a Fabry-Perot cavity. This device achieves high extinction ratios by leveraging phosphorene

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    Area of Science:

    • Terahertz (THz) optics
    • Materials science
    • Nanophotonics

    Background:

    • Polarizers are crucial optical components for controlling light polarization.
    • Existing THz polarizers often lack tunability and high performance.
    • Phosphorene exhibits unique in-plane anisotropic properties.

    Purpose of the Study:

    • To demonstrate a tunable reflection-type polarizer in the terahertz regime.
    • To investigate the mechanism behind polarization-selective reflection using phosphorene.
    • To explore the tunability of the polarizer's operating frequency.

    Main Methods:

    • Fabrication of a Fabry-Perot cavity incorporating a monolayer phosphorene.
    • Analysis using the transfer-matrix method and finite-difference time-domain (FDTD) method.
    • Characterization of reflection spectrum, electric field distribution, energy flow, and power dissipation density.

    Main Results:

    • Achieved a polarization-selected reflection with an extinction ratio > 20 dB and reflectivity ~50%.
    • Identified in-plane anisotropic absorption of phosphorene as the primary mechanism for polarization selection.
    • Demonstrated tunability of the operating frequency via incident angle, doping, and strain.

    Conclusions:

    • The developed THz polarizer leverages phosphorene's anisotropic absorption and cavity resonance for high-performance polarization control.
    • The polarizer's frequency tunability opens avenues for dynamic THz applications.
    • Potential applications include THz filters, detectors, and biosensors.