Fourier ptychography

Fourier ptychography is a microscopy imaging technique[1] using coherent illumination that allows non-interferometric phase imaging and near wavelength diffraction-limited resolution. It requires the collection of multiple views of an object acquired using different illumination angle from coherent sources (typically a LED array), and the iterative reconstruction of the object using a phase retrieval algorithm.

It is related to (conventional) ptychography[2] in that it solves the phase problem by permuting the role of the real and the Fourier space, by swapping the focusing element and the object.

Among the advantages of Fourier ptychography is the ability to use imaging optics with lower numerical aperture, hence improving the depth of focus, the working distance, the size of the field of view. It also allows for the numerical correction of lens aberrations, leading to very space-bandwidth product (the resolution times exploitable size of an image).

See Also

References

  1. ↑ G. Zheng, R. Horstmeyer and C. Yang (2013). "Wide-field, high-resolution Fourier ptychographic microscopy". Nature Photonics 7 (9): 739–745. doi:10.1038/nphoton.2013.187.
  2. ↑ R. Horstmeyer and C. Yang (2014). "A phase space model of Fourier ptychographic microscopy". Optics Express 22 (1): 604–612. doi:10.1364/OE.22.000338.
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