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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Nanotechnology

    Background:

    • Perfect absorbers are crucial for various optoelectronic applications.
    • Existing designs often struggle with polarization insensitivity and tunability.
    • Graphene's unique properties offer potential for advanced optical devices.

    Purpose of the Study:

    • To propose a novel thin film structure for polarization-insensitive reconfigurable perfect absorption.
    • To investigate the role of graphene quality, chemical potential, and particle arrangement.
    • To explore methods for achieving broadband and multiband absorption characteristics.

    Main Methods:

    • Theoretical proposal of a periodic assembly of graphene-wrapped spherical particles.
    • Analysis of localized surface plasmon resonances (LSPR) on graphene shells.
    • Simulation and investigation of the effects of material properties and structural parameters.
    • Exploration of substrate engineering for dynamic and static broadband absorption.

    Main Results:

    • The proposed structure achieves polarization-insensitive perfect absorption up to 60 degrees for both TE and TM waves.
    • Low-quality graphene is identified as optimal for absorber design.
    • Dynamic broadband absorption is achieved by engineering substrate height, enhancing Fabry-Perot resonances.
    • Static broadband absorption can be realized by stacking multiple layers.

    Conclusions:

    • The proposed sub-wavelength absorber demonstrates excellent performance characteristics.
    • Its simple geometry and reconfigurable nature make it suitable for advanced optoelectronic devices.
    • The findings pave the way for new applications in sensing, detection, and energy harvesting.