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Achromatic terahertz quarter waveplate based on silicon grating.

Banghong Zhang, Yandong Gong

    Optics Express
    |June 16, 2015
    PubMed
    Summary

    This study introduces an achromatic quarter-waveplate (QWP) using a silicon grating for terahertz frequencies. The novel design significantly broadens the operational bandwidth of terahertz waveplates.

    Area of Science:

    • Optics and Photonics
    • Terahertz Science and Technology

    Background:

    • Quarter-waveplates (QWPs) are crucial optical components for manipulating light polarization.
    • Conventional QWPs exhibit significant frequency dependence, limiting their use in broadband applications.

    Purpose of the Study:

    • To propose and demonstrate a novel achromatic quarter-waveplate (QWP) for terahertz (THz) frequency applications.
    • To overcome the limitations of conventional QWPs by achieving a wide operational bandwidth.

    Main Methods:

    • Design of a QWP based on a silicon grating structure with a large fill factor and period optimized for THz wavelengths.
    • Fabrication of the proposed silicon grating QWP.
    • Experimental characterization of the fabricated QWP to evaluate its performance across a range of THz frequencies.

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    Main Results:

    • The fabricated achromatic QWP demonstrated excellent wideband performance in the terahertz frequency range of [0.47, 0.8] THz.
    • The operational bandwidth was found to be more than 6 times wider than conventional QWPs operating at a single frequency (0.5 THz), considering a ±3% variance in phase retardation.
    • The grating structure effectively compensated for the frequency dependence of the waveplate.

    Conclusions:

    • The proposed silicon grating scheme offers a viable solution for creating achromatic QWPs in the terahertz frequency range.
    • This advancement enables robust polarization control for broadband terahertz applications, overcoming previous bandwidth limitations.