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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Ultra-wideband double-layer THz frequency selective surfaces.

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    A novel double-layer ultra-wideband terahertz frequency selective surface (FSS) was designed for 6G communications. Laser machining parameters were optimized to ensure accurate and efficient fabrication of these compact spatial filters.

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    Area of Science:

    • Electromagnetics
    • Materials Science
    • Telecommunications Engineering

    Background:

    • Frequency selective surfaces (FSSs) are crucial for controlling electromagnetic wave transmission and reflection.
    • The terahertz band is a key focus for 6G communication technology, demanding miniaturized devices.
    • Compact and efficient terahertz FSS designs are needed to meet 6G requirements.

    Purpose of the Study:

    • To design a compact, double-layer, ultra-wideband terahertz FSS for enhanced terahertz wave transmission.
    • To investigate and optimize the laser machining process for fabricating the designed terahertz FSS.
    • To validate the performance of the fabricated FSS through experimental testing.

    Main Methods:

    • A double-layer FSS cell structure with cascaded square ring-gaps was designed.
    • Simulations were performed to analyze transmission characteristics and polarization stability.
    • Laser machining parameters (scanning speed, power, scans) were systematically studied.
    • Fabricated FSS samples were tested to measure transmission coefficients.

    Main Results:

    • The designed FSS exhibits an ultra-wideband passband from 0.407 to 0.761 THz (0.354 THz bandwidth).
    • The FSS demonstrates polarization stability for incidence angles up to 60°.
    • Optimized laser machining parameters achieved both high accuracy and efficiency.
    • Experimental results closely matched simulation predictions.

    Conclusions:

    • The developed double-layer terahertz FSS offers significant operating bandwidth and sharp spectral transitions.
    • The optimized laser machining process enables precise fabrication of compact terahertz FSS devices.
    • This work contributes to the advancement of terahertz components for future 6G communication systems.