Enhancing the Resolution of a low NA Microscope via Fourier Ptychography

This talk explores how the resolution of a low numerical aperture microscope can be enhanced using off-the-shelf materials and the computational imaging technique, Fourier ptychography (FP). This technique employs a shifting illumination to illuminate various parts of the sample. The captured intensity measurements are used to reconstruct the Fourier spectrum of the high-resolution object by using a similar approach to synthetic aperture method. Moreover, the phase is recovered by using a phase retrieval algorithm. In this FP implementation, the main components of the imaging setup are a stereo microscope, a 7x7 LED array, and a mobile phone. The Embedded Pupil Recovery (EPRY) algorithm is investigated here. Experiments are conducted to demonstrate the capability of FP to increase the resolution.