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Related Experiment Videos

Fresnel fringes in STEM

C Colliex, A J Craven, C J Wilson

    Ultramicroscopy
    |August 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Field emission scanning transmission electron microscopy (STEM) reveals Fresnel fringes at specimen edges, matching computed profiles. Optimizing fringe visibility requires balancing detection coherence and signal-to-noise ratio by adjusting aperture size.

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    Area of Science:

    • Materials Science
    • Electron Microscopy
    • Physics

    Background:

    • Fresnel fringes observed at specimen edges in electron microscopy provide insights into imaging mechanisms.
    • Previous studies primarily focused on conventional transmission electron microscopy (CTEM) for fringe analysis.

    Purpose of the Study:

    • To investigate the formation and characteristics of Fresnel fringes using field emission scanning transmission electron microscopy (STEM).
    • To analyze the influence of experimental parameters like defocusing distance and collector aperture size on fringe visibility.
    • To establish optimal conditions for observing the maximum number of Fresnel fringes in STEM imaging.

    Main Methods:

    • Field emission STEM experiments were conducted on specimen edges.
    • Observed fringe patterns were analyzed and compared with computer-generated profiles for idealized edges.

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  • The impact of defocusing distance and collector aperture size on fringe characteristics was systematically evaluated.

    • Main Results:

    • Several Fresnel fringes were observed along specimen edges in STEM, consistent with CTEM observations.
    • Experimental data showed good agreement with theoretical profiles for idealized edges.
    • Signal-to-noise ratio was identified as the primary limitation for fringe visibility under highly coherent detection conditions.

    Conclusions:

    • Field emission STEM is capable of resolving Fresnel fringes at specimen edges.
    • The number of observable fringes is constrained by the trade-off between detection coherence and signal-to-noise ratio.
    • Selecting an appropriate collector aperture size is crucial for maximizing fringe observation by balancing these competing factors.