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    Area of Science:

    • Optics and Photonics
    • Terahertz (THz) Technology

    Background:

    • Waveplates are crucial optical components for manipulating light polarization.
    • Existing waveplates often face limitations in specific frequency ranges or polarization states.
    • High refractive index contrast materials offer potential for novel waveplate designs.

    Purpose of the Study:

    • To develop high-contrast-grating (HCG) waveplates for THz applications.
    • To achieve quarter-wave and half-wave plate functionality.
    • To enhance anti-reflective properties and reduce polarization-dependent losses.

    Main Methods:

    • Fabrication of HCG structures using silicon and air.
    • Design optimization considering grating wall inclination.
    • Characterization using THz time-domain spectroscopy (TDS) and vector network analysis (VNA).

    Main Results:

    • Demonstrated quarter-wave and half-wave plate performance in the THz range.
    • Achieved significant suppression of reflection losses for both TE and TM polarizations.
    • Reduced the transmittance gap between polarizations and mitigated the Fabry-Perot effect.

    Conclusions:

    • HCG waveplates offer a promising solution for THz polarization control.
    • The designed structures exhibit excellent anti-reflective and polarization-preserving properties.
    • The validated concept holds potential for real-world THz optical systems.