Optical representation of binary data based on both intensity and phase modulation with a twisted-nematic liquid-crystal display for holographic digital data storage

摘要

We propose a method of representing binary data by modulating both the intensity and the phase of beams with a twisted-nematic liquid-crystal display. With our method it is possible to reduce the dc component of the data image and thus improve the beam-intensity uniformity at the holographic recording plane when one is recording Fourier-plane holograms to obtain maximal areal storage density in disk-shaped storage media. The feasibility of our method is demonstrated experimentally.