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Extreme ultraviolet lensless imaging without object support through rotational diversity in diffractive shearing

A C C de Beurs, X Liu, G S M Jansen

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    This study introduces rotational diffractive shearing interferometry for microscopic imaging. The method reconstructs images from extreme-ultraviolet diffraction patterns without prior object knowledge, using only a few rotations.

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    Area of Science:

    • Optics and Photonics
    • Microscopy
    • Image Reconstruction

    Background:

    • Microscopic image reconstruction often requires object support constraints or prior knowledge.
    • Extreme-ultraviolet (EUV) imaging presents unique challenges due to wavelength and source characteristics.

    Purpose of the Study:

    • To develop a novel method for microscopic image reconstruction from EUV diffraction patterns.
    • To eliminate the need for object support constraints or prior structural information.
    • To demonstrate robust imaging using limited angular sampling.

    Main Methods:

    • Utilizing rotational diffractive shearing interferometry.
    • Generating a rotationally asymmetric probe beam via interference of two phase-coherent high-harmonic beams.
    • Acquiring diffraction patterns from an object at three to five different rotations.

    Main Results:

    • Successful reconstruction of microscopic images without prior object knowledge.
    • Demonstration of robust image reconstruction at wavelengths around 30 nm.
    • Validation of the method's effectiveness with limited rotational data.

    Conclusions:

    • Rotational diffractive shearing interferometry offers a powerful approach for label-free microscopic imaging.
    • The method overcomes limitations of traditional diffraction-based imaging techniques.
    • This technique enables high-resolution imaging in the extreme-ultraviolet spectrum.