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Reflective Fourier ptychography.

Shaun Pacheco1, Guoan Zheng2, Rongguang Liang1

  • 1University of Arizona, College of Optical Sciences, 1630 East University Boulevard, Tucson, Arizona 85721, United States.

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Summary
This summary is machine-generated.

This study introduces a new Fourier ptychography setup that overcomes previous limitations. The enhanced optical system achieves higher resolution imaging over a large field of view for various applications.

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Area of Science:

  • Optics and Photonics
  • Biomedical Imaging
  • Metrology

Background:

  • Fourier ptychography in reflection mode offers potential for tissue imaging and optical inspection.
  • Current configurations face limitations in cut-off frequency or practicality.
  • Achieving high resolution over a large field of view remains a challenge.

Purpose of the Study:

  • To develop a novel Fourier ptychography configuration to overcome limitations of existing methods.
  • To enhance the cut-off frequency beyond the diffraction limit for incoherent epi-illumination.
  • To enable high-resolution imaging over a large field of view using a simple objective.

Main Methods:

  • A modified optical system was designed by placing the imaging aperture stop outside the illumination path.
  • This configuration allows the illumination numerical aperture (NA) to exceed the objective lens's imaging NA.
  • The system was experimentally validated to demonstrate its performance.

Main Results:

  • The proposed optical system achieved a cut-off frequency greater than twice the objective's NA divided by the wavelength (2NAobj/λ).
  • Experimental demonstration showed a 4.5-fold increase in synthesized NA.
  • High-resolution imaging over a large field of view was successfully achieved.

Conclusions:

  • The novel Fourier ptychography configuration effectively enhances the synthesized NA and cut-off frequency.
  • This approach overcomes the diffraction limit in incoherent epi-illumination.
  • The system offers a practical solution for high-resolution, large-field-of-view imaging in diverse applications like endoscopy, biomedical imaging, and industrial inspection.