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Broadband terahertz guided-mode resonance filter using cyclic olefin copolymer.

Hyeon Sang Bark, Mun-Won Park, In Hyung Baek

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    |March 18, 2022
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    We developed a new terahertz (THz) filter using cyclic olefin copolymer (COC) films. This all-dielectric guided-mode resonance filter (GMRF) achieves high-frequency operation up to 2.759 THz, surpassing previous limits.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Terahertz Technology

    Background:

    • Guided-mode resonance filters (GMRFs) are crucial optical components.
    • Operating GMRFs in the high-frequency terahertz (THz) region presents fabrication challenges.
    • Material properties like low refractive index, low absorption, and high tensile strength are critical for THz GMRFs.

    Purpose of the Study:

    • To propose and fabricate an all-dielectric single-layer GMRF for high-frequency THz applications.
    • To investigate the suitability of cyclic olefin copolymer (COC) films for THz GMRF fabrication.
    • To demonstrate GMRF operation at significantly higher THz frequencies than previously achieved.

    Main Methods:

    • Material characterization of COC films, comparing them to polyethylene terephthalate (PET) and polytetrafluoroethylene (PTFE).
    • Fabrication of single-layer COC-based GMRFs with varying grating periods (500 to 100 µm).
    • Experimental measurement of resonance frequencies and comparison with rigorous coupled-wave analysis (RCWA) simulations.

    Main Results:

    • COC films exhibit favorable properties (low refractive index, low absorption, high tensile strength) for THz GMRF fabrication.
    • Fabricated COC GMRFs showed resonance frequencies shifting to higher THz values with shorter grating periods.
    • A GMRF with a 100-µm grating period achieved operation up to 2.759 THz, a significant advancement from the previous 0.7 THz limit.

    Conclusions:

    • Cyclic olefin copolymer (COC) is a suitable material for fabricating high-frequency THz guided-mode resonance filters.
    • The proposed all-dielectric single-layer GMRF design enables operation at unprecedented THz frequencies.
    • This work paves the way for advanced THz devices utilizing novel materials and fabrication techniques.