Diffractive shear interferometry for extreme ultraviolet high-resolution lensless imaging.

Area of Science:

• Optics and Photonics
• Coherent Diffractive Imaging
• Spectroscopy

Background:

• Far-field coherent diffractive imaging (CDI) is a powerful technique for high-resolution imaging.
• Traditional CDI methods can be sensitive to noise and may require extensive computation for reconstruction.
• Advanced imaging techniques are needed to improve accuracy and efficiency.

Purpose of the Study:

• To develop a novel imaging approach for far-field coherent diffractive imaging.
• To enhance reconstruction accuracy, robustness against noise, and convergence speed.
• To achieve spectrally resolved imaging in the extreme ultraviolet (EUV) range.

Main Methods:

• Demonstration of a novel imaging approach based on measuring laterally sheared diffraction patterns.
• Development of an associated reconstruction algorithm utilizing differential phase information.
• Measurement of diffraction patterns using Fourier-transform spectroscopy with phase-locked pulse pairs from a high-harmonic source.

Main Results:

• The differential phase profile retrieval leads to improved reconstruction accuracy.
• The novel method shows increased robustness against noise compared to traditional CDI.
• Faster convergence of the reconstruction algorithm was observed.
• Spectrally resolved imaging was successfully demonstrated at extreme ultraviolet wavelengths (28-35 nm).

Conclusions:

• The developed imaging approach offers significant advantages over traditional CDI methods.
• This technique provides a robust platform for high-accuracy, spectrally resolved imaging.
• The method is particularly promising for applications in the extreme ultraviolet spectral range.