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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Conventional microbolometers utilize square membrane geometries for long-wavelength infrared (LWIR) absorption.
    • Vanadium dioxide (VO2) and silicon nitride (Si3N4) are key materials in microbolometer fabrication, influencing thermal capacity.

    Purpose of the Study:

    • To design and numerically study absorbers with reduced geometry integrated with a gold cross antenna for enhanced LWIR absorption.
    • To compare the performance of the reduced geometry absorber against conventional square membrane designs.

    Main Methods:

    • Numerical simulations were employed to study absorbers with reduced geometry coupled to a gold cross antenna.
    • Thermal capacities of vanadium dioxide (VO2) and silicon nitride (Si3N4) layers were analyzed in the reduced geometry.

    Main Results:

    • The reduced geometry absorber exhibits smaller thermal capacities compared to square membranes.
    • Near-field focusing by the cross antenna significantly enhances LWIR absorption.
    • Temperature change per incident energy increases with decreasing arm width.
    • The reduced absorber outperforms square geometry across all incident angles and polarizations.

    Conclusions:

    • The antenna-based reduced absorber presents a viable alternative geometry for developing high-performance microbolometers.
    • This design offers improved thermal sensitivity and absorption efficiency for LWIR detection applications.