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Non-contact, Label-free Monitoring of Cells and Extracellular Matrix using Raman Spectroscopy
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Measuring the multilayer silicon based microstructure using differential reflectance spectroscopy.

Shuchun Huo, Hao Wang, Chunguang Hu

    Optics Express
    |March 27, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Accurate thickness measurement of ultra-thin display films is essential for manufacturing. A new method uses differential reflectance spectroscopy and a layer reduction model for fast, precise characterization of sub-20nm layers.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Nanotechnology

    Background:

    • Display panel yield relies on precise multilayer film thickness.
    • Characterizing sub-20nm layers with similar optical constants is challenging.
    • Existing optical spectroscopy methods face limitations with thin, dissimilar layers.

    Purpose of the Study:

    • To develop a fast, accurate method for measuring multilayer film thickness in single pixels.
    • To overcome limitations of optical spectroscopy for sub-20nm layers with varying thicknesses.
    • To enable precise manufacturing of ultra-thin display panels.

    Main Methods:

    • Combines a layer number reducing model with micro-area differential reflectance spectroscopy.
    • Treats lower layers as semi-infinite to simplify fitting algorithms.
    • Applies the method to a p-Si/a-Si/n-Si multilayer silicon microstructure.

    Main Results:

    • Successfully measured the thickness of a multilayer silicon microstructure (10nm/950nm/50nm).
    • Achieved measurement in 2 seconds with a 60-micron light spot.
    • Demonstrated a measurement deviation of only 3% compared to an ellipsometer.

    Conclusions:

    • The proposed method effectively reduces layer complexity for fitting multilayer thicknesses.
    • It accurately characterizes films with large thickness differences and similar optical constants.
    • Provides a powerful tool for multilayer microstructure characterization in display manufacturing.