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Updated: Jan 27, 2026

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Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
Published on: April 25, 2019
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Diffraction-limited superresolution ptychography in the Rayleigh-Sommerfeld regime
Summary
Lensless near-field ptychography achieves superresolution using curved illumination. This technique reconstructs details smaller than sensor pixels and effective numerical aperture, enabling high-resolution imaging.
Area of Science:
- Optics and Photonics
- Microscopy and Imaging
Background:
- Lensless imaging techniques offer advantages in cost and simplicity.
- Achieving superresolution in near-field microscopy is crucial for nanoscale investigations.
Purpose of the Study:
- To demonstrate superresolution in lensless near-field ptychography.
- To enable the reconstruction of object details smaller than the sensor's pixel size and effective numerical aperture.
Main Methods:
- Application of a strongly curved illumination function.
- Reconstruction using the Rayleigh-Sommerfeld diffraction integral.
- Implementation via a pixel-size adjustable angular spectrum method.
Main Results:
- Experimental validation of superresolution using a US Air Force resolution test target.
- Demonstration of reconstructing details smaller than the sensor's effective numerical aperture.
- Successful application of the Rayleigh-Sommerfeld diffraction integral for reconstruction.
Conclusions:
- The developed method enables superresolution in lensless near-field ptychography.
- The technique can be extended to other coherent diffractive imaging modalities.
- High-resolution near-field quantitative phase imaging is achievable.
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