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    Area of Science:

    • Electromagnetics
    • Metamaterials
    • Computational Physics

    Background:

    • Optical cloaking aims to render objects invisible by controlling electromagnetic wave scattering.
    • Previous methods often face limitations in achieving directional cloaking or practical implementation.

    Purpose of the Study:

    • To propose and experimentally realize a directional optical cloaking technique using a genetic algorithm.
    • To design a cloaking structure that suppresses scattered fields around a cylindrical object.

    Main Methods:

    • Combined a three-dimensional finite-difference time-domain (3D-FDTD) method with a genetic optimization algorithm.
    • Designed the permittivity distribution of a dielectric polylactide material for cloaking.
    • Fabricated the cloaking structure using 3D printing for experimental verification at microwave frequencies.

    Main Results:

    • Successfully designed a directional optical cloaking structure capable of suppressing undesired scattered fields.
    • Experimental verification at microwave frequencies confirmed the cloaking effect.
    • Demonstrated the feasibility of using genetic algorithms for designing complex metamaterial structures.

    Conclusions:

    • The proposed genetic algorithm-based approach is effective for designing directional optical cloaking structures.
    • The study highlights the potential of 3D printing for fabricating advanced electromagnetic devices.
    • The physical mechanisms involve imperfect conformal mapping and small-scale scattering compensation.