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Scanning-probe Single-electron Capacitance Spectroscopy
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    A new heterodyne holography technique enables quantitative phase imaging with scanning probe microscopy. This method retrieves complex scattered fields in a single scan, overcoming limitations of traditional holography.

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    Area of Science:

    • Optics and Photonics
    • Microscopy Techniques
    • Holography

    Background:

    • Quantitative phase imaging is crucial for nanoscale metrology.
    • Traditional phase shifting methods (PSM) have limitations in scanning probe microscopy.
    • Off-axis holography can be complex to implement and analyze.

    Purpose of the Study:

    • To introduce a novel implementation of continuous phase shifting method (PSM) using heterodyne holography.
    • To enable retrieval of the complex scattered field in an on-axis configuration within scanning probe microscopy.
    • To provide quantitative phase imaging with enhanced accuracy and efficiency.

    Main Methods:

    • Implementation of heterodyne holography in a scanning probe microscope.
    • Acquisition of a continuous hologram sequence at different wavelengths during a single scan.
    • Combination of scanning interference microscopy with frequency-domain low-coherent signal acquisition.

    Main Results:

    • Successful retrieval of the complex scattered field in an on-axis configuration.
    • Demonstration of quantitative phase imaging capabilities.
    • Overcoming limitations associated with off-axis holography.

    Conclusions:

    • The developed heterodyne holography method offers a powerful tool for quantitative phase imaging in scanning probe microscopy.
    • This technique combines the advantages of PSM with improved efficiency and reduced complexity.
    • It represents a significant advancement for nanoscale optical metrology and imaging.