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Characterization of T-ray binary lenses.

S Wang, T Yuan, E D Walsby

    Optics Letters
    |November 21, 2007
    PubMed
    Summary
    This summary is machine-generated.

    Multilevel phase-shift Fresnel diffractive zone plates serve as effective terahertz (THz) imaging lenses. These silicon-based diffractive THz lenses offer performance comparable to or exceeding conventional refractive lenses for narrow-band applications.

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    Area of Science:

    • Optics and Photonics
    • Terahertz (THz) Science and Technology

    Background:

    • Conventional refractive lenses for terahertz (THz) imaging face limitations.
    • Diffractive optics offer potential advantages for THz applications.

    Purpose of the Study:

    • To investigate the use of multilevel phase-shift Fresnel diffractive zone plates as THz imaging lenses.
    • To evaluate the performance of these diffractive THz lenses compared to refractive lenses.

    Main Methods:

    • Fabrication of multilevel phase-shift Fresnel diffractive zone plates on silicon wafers.
    • Characterization of T-ray imaging performance, including spatial and temporal distribution at focal planes.
    • Testing across a frequency range of 0.5 to 1.5 THz.

    Main Results:

    • The fabricated diffractive zone plates function effectively as THz imaging lenses.
    • Imaging results demonstrate performance comparable to or better than conventional refractive THz lenses.
    • Spatial and temporal distributions of T-rays were successfully measured.

    Conclusions:

    • Multilevel phase-shift Fresnel diffractive zone plates are suitable for THz imaging.
    • These diffractive THz lenses provide excellent performance, particularly for narrow-band applications.
    • The unique properties of these binary THz lenses enable the fabrication of advanced THz optics.