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    This study presents a multiband terahertz absorber for detecting pesticides. The novel electric split resonant ring array design achieves high sensitivity for food safety applications.

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    Area of Science:

    • Photonics and Terahertz Technology
    • Materials Science
    • Chemical Sensing

    Background:

    • Multiband terahertz absorbers are crucial for terahertz wave manipulation.
    • Existing absorbers often lack efficiency or multiband capabilities.
    • Developing sensitive and selective terahertz absorbers is essential for various applications.

    Purpose of the Study:

    • To demonstrate a novel multiband terahertz absorber using improved electric split resonant ring arrays.
    • To investigate the absorption characteristics for both transverse magnetic (TM) and transverse electric (TE) polarizations.
    • To evaluate the absorber's performance in detecting pesticide concentrations for food safety.

    Main Methods:

    • Fabrication and experimental characterization of electric split resonant ring arrays.
    • Numerical simulations to verify absorption spectra and resonant behaviors.
    • Detection of 2,4-dichlorophenoxyacetic acid and chlorpyrifos solutions at varying concentrations.

    Main Results:

    • Achieved perfect absorption at 0.918 THz and 1.575 THz (TM polarization).
    • Observed absorption peaks at 0.581, 1.294, and 1.556 THz (TE polarization).
    • Successfully detected pesticide concentrations down to 0.1 ppm with high linear regression coefficients (0.9862 for TE, 0.9565 for TM).

    Conclusions:

    • The proposed electric split resonant ring array acts as an efficient multiband terahertz absorber.
    • The absorber demonstrates high sensitivity and selectivity for pesticide detection.
    • This technology holds significant potential for food safety monitoring applications.