Active single-pixel microscopy for quantitative phase imaging

In this work, a motionless method to achieve quantitative phase imaging in single-pixel microscopy based on the transport of intensity equation is presented. In this approach, a digital micromirror device is used to generate wide-field structured illumination over the sample. The light resulted by the interaction between the sequence of light patterns and the sample is collected using a bucket detector. The integration of a focus tunable lens allows the motionless acquisition of multiple intensity images required for applying the transport of intensity equation. Quantitative phase retrieval in active single-pixel microscopy is demonstrated by imaging calibrated pure-phase test targets.