研究目的
To design and numerically demonstrate an ultra-thin super-oscillatory metalens with a resolution below the diffraction limit, optimizing transparency and efficiency, and reducing side lobes while boosting the intensity at the focus.
研究成果
The designed metalens achieves subwavelength focusing with reduced side lobes and enhanced intensity at the focus, demonstrating the potential of super-oscillatory lenses in compact optical systems.
研究不足
The study is limited to numerical simulations at a specific frequency (0.327 THz), and the practical implementation's performance may vary due to material losses and manufacturing tolerances.
1：Experimental Design and Method Selection:
The design utilizes metasurface concepts with hexagonal unit cells and a novel two-step optimization technique based on evolutionary algorithms to enhance the lens's performance.
2：Sample Selection and Data Sources:
The lens is designed to operate at
3：327 THz, with unit cells engineered to ensure high transmittance and a phase difference of at least π/6 rad between even and odd zones. List of Experimental Equipment and Materials:
The design is simulated using the commercial software CST Microwave Studio?, with unit cells made of copper on a polypropylene slab.
4：Experimental Procedures and Operational Workflow:
The lens's performance is evaluated through numerical simulations, focusing on the power distribution and focal spot characteristics.
5：Data Analysis Methods:
The analysis includes evaluating the focal spot size, side lobe levels, and power enhancement at the focus.
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