Transfer function analysis in epi-illumination Fourier ptychography

Abstract

This Letter explores Fourier ptychography (FP) using epi-illumination. 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 $2\mathrm{NA}/\lambda$. 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.

© 2015 Optical Society of America

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