DMD-based pure-phase superpixel method for digital holography

Abstract

In this work, we implement a pure-phase superpixel (PPSP) method with a digital micromirror device (DMD). Here the DMD acts in an unconventional mode, i.e. as a phase-only modulator with hundreds of phase levels. An iterative Fourier transform algorithm is adapted to the DMD with high quality in a 2f-configuration without filters. When using 1600 × 1600 DMD pixels, the simulations show that the PPSP method in combination with the mixed-region amplitude freedom algorithm reduces the root-mean-square error by at least 33.5% compared with the conventional amplitude and phase modulation methods, and provides higher efficiency by 7.3%.