This Letter explores Fourier ptychography (FP) using epiillumination. The approach effectively modifies the FP transfer function to be coherent-like out to the incoherent limit of twice the numerical aperture over the wavelength 2NA/λ. Images reconstructed using this approach are shown to have higher contrast at finer details compared with images using incoherent illumination, indicating that the FP transfer function is superior in high spatial frequency regions.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics