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Method for designing a magic mirror system with a metalens.

Xin Ye, Ping Zhong, Fu Yang

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    |April 24, 2026
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    Summary

    This study presents a novel Magic Mirror inspection system using a dielectric metalens, replacing traditional lenses to eliminate assembly errors. This compact, alignment-free design enhances reliability for defect detection in semiconductor wafer inspection.

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    Area of Science:

    • Optics and Photonics
    • Metasurface Technology
    • Optical Metrology

    Background:

    • Conventional Magic Mirror inspection systems suffer from assembly errors and optical path redundancy due to multiple refractive lens elements.
    • Subsurface defect detection in semiconductor wafer inspection requires high optical performance and robustness against environmental factors.

    Purpose of the Study:

    • To introduce a novel design for a Magic Mirror inspection system utilizing a dielectric metalens.
    • To address and overcome the limitations of traditional refractive relay lens groups in inspection systems.
    • To enhance the compactness, robustness, and alignment-free nature of inspection systems for improved reliability.

    Main Methods:

    • Incorporation of a dielectric metalens to replace conventional refractive relay lens groups.
    • Optimization of the metalens for narrowband illumination (550 nm) with full 0-2π phase coverage.
    • Synergistic use of rigorous coupled-wave analysis (RCWA) and ray-tracing for system-level performance evaluation.

    Main Results:

    • The metalens-integrated system achieved near-diffraction-limited performance with on-axis RMS wavefront error below 0.2λ.
    • Modulation transfer function (MTF) comparable to traditional multi-element systems was maintained.
    • Elimination of inter-element alignment errors, unlike conventional double-Gauss relays which show significant degradation (mean RMS wavefront error ~3.4λ).

    Conclusions:

    • The monolithic metalens approach offers a compact, robust, and alignment-free solution for Magic Mirror inspection systems.
    • This design significantly improves the reliability of subsurface defect detection, particularly in semiconductor wafer inspection under narrowband illumination.
    • The proposed method presents a viable alternative to traditional optical designs, enhancing performance and simplifying assembly.