Abstract
Aperture-scanning Fourier ptychography is a configuration of Fourier ptychgraphy by scanning an aperture at the back focal plane of the objective lens. It has been a useful tool for measuring the complex scattering field exited from a sample. However, in this method the intensity of dark images at the charge coupled device (CCD) plane is of same order or even lower than the noise when the high frequency of the Fourier spectrum is filtered by the aperture. Therefore, the recorded dark field images suffer from low signal-to-noise ratio (SNR), which results in poor reconstruction. In this paper, we report a modified Fourier ptychographic imaging method by wavefront modulation. Instead of an aperture, a diffuser is used to modulate the spectrum in the presented method. The complex distribution of the sample and the diffuser are reconstructed simultaneously via iterative phase retrieval. Numerical simulations and proof-of-concept experiments have been carried out to demonstrate the feasibility of the presented method.
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