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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Contact metalens for high-resolution optical microscope in semiconductor failure analysis.

Soh Uenoyama, Yu Takiguchi, Koji Takahashi

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    |November 13, 2020
    PubMed
    Summary

    A novel metalens enhances optical microscopic imaging for semiconductor failure analysis by overcoming total internal reflection. This breakthrough improves resolution for analyzing smaller electronic devices.

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    Area of Science:

    • Optics
    • Materials Science
    • Electrical Engineering

    Background:

    • Semiconductor failure analysis (FA) demands higher resolution optical microscopy due to device miniaturization.
    • Total internal reflection (TIR) at the silicon-air interface limits light collection, hindering image resolution in FA.
    • Existing optical methods struggle to capture fine details in advanced semiconductor structures.

    Purpose of the Study:

    • To develop a metalens capable of overcoming TIR at the silicon-air interface.
    • To enhance the resolution of optical microscopic images for semiconductor FA.
    • To demonstrate the practical application of the metalens in FA workflows.

    Main Methods:

    • Fabrication of a specialized metalens designed to manipulate light beyond the critical angle of TIR.
    • Integration of the metalens into an optical microscopic setup for FA.
    • Acquisition and comparative analysis of optical microscopic images before and after metalens integration.

    Main Results:

    • The fabricated metalens successfully collected diffracted light beyond the critical angle of TIR.
    • Optical microscopic images acquired with the metalens showed significantly improved resolution.
    • Clearer visualization of semiconductor patterns was achieved, aiding failure analysis.

    Conclusions:

    • The proposed metalens is effective in enhancing optical microscopic image resolution for semiconductor FA.
    • This technology addresses a key limitation in analyzing downscaled electronic devices.
    • The metalens offers a promising solution for more detailed and accurate semiconductor failure analysis.